HIARCS Chess Software

HIARCS Chess Software Latest News

This is where we will announce the most recent additions to our website. If you have visited us before and want to know what has changed, take a look here first. We will place notices here regarding product updates, scheduled releases etc.

Saturday 3rd May 2025

  • May 2025 Online Book Access update, over 125 million positions with statistics - all positions and moves deeply analysed with play recommendations.
    • Latest HIARCS Human reference and GM++ books contain all the moves and stats from over the board and correspondence games up to May 2025. Subscribers can see the very latest theory, play recommendations and download the top games from March 2025 to enjoy in HIARCS Chess Explorer (Pro).
    Human Reference book 64,081,398 positions/moves, 2,803,596 variations based on 2,274,310 high quality human games
    GM++ top human chess book: 29,561,310 positions/moves, 1,315,133 variations based on 1,146,973 GM human games
    Tournament CTG Book with 32,270,531 positions/moves and 1,894,759 variations based on 1,891,049 top quality games

    Wednesday 2nd April 2025

  • April 2025 Online Book Access update, over 125 million positions with statistics - all positions and moves deeply analysed with play recommendations.
    • Latest HIARCS Human reference and GM++ books contain all the moves and stats from over the board and correspondence games up to April 2025. Subscribers can see the very latest theory, play recommendations and download the top games from March 2025 to enjoy in HIARCS Chess Explorer (Pro).
    Human Reference book 63,839,155 positions/moves, 2,790,572 variations based on 2,263,362 high quality human games
    GM++ top human chess book: 29,401,031 positions/moves, 1,305,874 variations based on 1,138,840 GM human games
    Tournament CTG Book with 32,270,531 positions/moves and 1,894,759 variations based on 1,891,049 top quality games

    Friday 21st March 2025

  • Mid March 2025 Tournament CTG Book update, over 32.2 million positions, with statistics - all analysed with play recommendations
    • Tournament CTG Book with 32,270,531 positions/moves and 1,894,759 variations based on 1,891,049 top quality games

    Monday 3rd March 2025

  • March 2025 Online Book Access update, over 125 million positions with statistics - all positions and moves deeply analysed with play recommendations.
    • Latest HIARCS Human reference and GM++ books contain all the moves and stats from over the board and correspondence games up to March 2025. Subscribers can see the very latest theory, play recommendations and download the top games from February 2025 to enjoy in HIARCS Chess Explorer (Pro).
    Human Reference book 63,692,502 positions/moves, 2,783,190 variations based on 2,257,369 high quality human games
    GM++ top human chess book: 29,324,354 positions/moves, 1,301,630 variations based on 1,135,185 GM human games
    Tournament Book with 32,081,267 positions/moves and 1,881,792 variations based on 1,766,283 top quality games

    Tuesday 4th February 2025

  • February 2025 Online Book Access update, over 124 million positions with statistics - all positions and moves deeply analysed with play recommendations.
    • Latest HIARCS Human reference and GM++ books contain all the moves and stats from over the board and correspondence games up to February 2025. Subscribers can see the very latest theory, play recommendations and download the top games from January 2025 to enjoy in HIARCS Chess Explorer (Pro).
    Human Reference book 63,564,985 positions/moves, 2,776,193 variations based on 2,251,447 high quality human games
    GM++ top human chess book: 29,232,225 positions/moves, 1,296,346 variations based on 1,130,583 GM human games
    Tournament Book with 32,081,267 positions/moves and 1,881,792 variations based on 1,766,283 top quality games

    Saturday, 1st February 2025

    New 2025 release: HIARCS Chess Explorer Pro v1.4 available as a free update for all HCE Pro customers!

    Key improvements include:



    Saturday, 1st February 2025

    New 2025 release: HIARCS Chess Explorer v1.13 available as a free update for all HCE customers!

    Key improvements include:



    Wednesday 1st January 2025

  • WISHING ALL OUR CUSTOMERS AND VISITORS A HAPPY NEW YEAR FOR 2025

  • January 2025 Online Book Access update, over 124 million positions with statistics - all positions and moves deeply analysed with play recommendations.
    • Latest HIARCS Human reference and GM++ books contain all the moves and stats from over the board and correspondence games up to January 2025. Subscribers can see the very latest theory, play recommendations and download the top games from December 2024 to enjoy in HIARCS Chess Explorer (Pro).
    Human Reference book 63,455,511 positions/moves, 2,770,345 variations based on 2,246,469 high quality human games
    GM++ top human chess book: 29,160,117 positions/moves, 1,292,200 variations based on 1,126,912 GM human games
    Tournament Book with 32,081,267 positions/moves and 1,881,792 variations based on 1,766,283 top quality games

    Tuesday 17th December 2024

  • Mid December 2024 Tournament CTG Book update, now 32 million positions, with statistics - all analysed with play recommendations
    • Tournament CTG Book with 32,081,267 positions/moves and 1,881,792 variations based on 1,766,283 top quality games

    Monday 16th December 2024

  • Mid December 2024 Online Book Access update, over 124 million positions with statistics - all positions and moves deeply analysed with play recommendations.
    • Latest HIARCS Human reference and GM++ books contain all the moves and stats from over the board and correspondence games up to December 2024. Subscribers can download the top games from Nov/Dec 2024 to enjoy in HIARCS Chess Explorer (Pro).
    Human Reference book 63,389,975 positions/moves, 2,767,515 variations based on 2,224,332 high quality human games
    GM++ top human chess book: 29,144,966 positions/moves, 1,291,557 variations based on 1,126,418 GM human games
    Tournament Book with 32,081,267 positions/moves and 1,881,792 variations based on 1,766,283 top quality games

    Monday 2nd December 2024

  • December 2024 Online Book Access update, over 124 million positions with statistics - all positions and moves deeply analysed with play recommendations.
    • Latest HIARCS Human reference and GM++ books contain all the moves and stats from over the board and correspondence games up to December 2024. Subscribers can download the top games from November 2024 to enjoy in HIARCS Chess Explorer (Pro).
    Human Reference book 62,929,446 positions/moves, 2,747,013 variations based on 2,224,685 high quality human games
    GM++ top human chess book: 29,386,276 positions/moves, 1,300,453 variations based on 1,131,905 GM human games
    Tournament Book with 32,028,077 positions/moves and 1,875,823 variations based on 1,759,080 top quality games

    Friday 1st November 2024

  • November 2024 Online Book Access update, over 123 million positions with statistics - all positions and moves deeply analysed with play recommendations.
    • Latest HIARCS Human reference and GM++ books contain all the moves and stats from over the board and correspondence games up to November 2024. Subscribers can download the top games from October 2024 to enjoy in HIARCS Chess Explorer (Pro).
    Human Reference book 62,438,217 positions/moves, 2,724,281 variations based on 2,207,663 high quality human games
    GM++ top human chess book: 29,230,808 positions/moves, 1,292,761 variations based on 1,125,744 GM human games
    Tournament Book with 32,028,077 positions/moves and 1,875,823 variations based on 1,759,080 top quality games

    Wednesday 16th October 2024

  • We are excited to announce we have switched to a new Merchant of Record called Paddle, a global eCommerce company based in the UK, who handles payment processing, tax compliance, invoicing as the entity in the transaction to purchase a license to use our Software. Paddle are a complete payment infrastructure provider for software companies.

    • Tuesday 1st October 2024

  • October 2024 Online Book Access update, over 123 million positions with statistics - all positions and moves deeply analysed with play recommendations.
    • Latest HIARCS Human reference and GM++ books contain all the moves and stats from the top games at the 45th Chess Olympiad 2024. Subscribers can download the games to enjoy in HIARCS Chess Explorer (Pro).
    Human Reference book 62,239,222 positions/moves, 2,714,675 variations based on 2,199,996 high quality human games
    GM++ top human chess book: 29,129,691 positions/moves, 1,287,492 variations based on 1,121,337 GM human games
    Tournament Book with 32,028,077 positions/moves and 1,875,823 variations based on 1,759,080 top quality games

    Monday 23th September 2024

  • Late September 2024 Online Book Access update, over 123 million positions with statistics - all positions and moves deeply analysed with play recommendations.
    • Latest HIARCS Human reference and GM++ books contain all the moves and stats from the top games at the 45th Chess Olympiad 2024. Subscribers can download the games to enjoy in HIARCS Chess Explorer (Pro).
    Human Reference book 62,228,403 positions/moves, 2,714,194 variations based on 2,199,612 high quality human games
    GM++ top human chess book: 29,127,460 positions/moves, 1,287,401 variations based on 1,121,270 GM human games
    Tournament Book with 32,028,077 positions/moves and 1,875,823 variations based on 1,759,080 top quality games

    Monday 16th September 2024

  • HIARCS Chess Explorer Pro v1.3.3 compatible with latest macOS 15 Sequoia
  • HIARCS Chess Explorer v1.12.2 compatible with latest macOS 15 Sequoia
  • Mid September 2024 Online Book Access update, over 123 million positions with statistics - all positions and moves deeply analysed with play recommendations.
    • Human Reference book 62,184,720 positions/moves, 2,712,309 variations based on 2,198,194 high quality human games
    GM++ top human chess book: 29,105,152 positions/moves, 1,286,467 variations based on 1,120,561 GM human games
    Tournament Book with 32,028,077 positions/moves and 1,875,823 variations based on 1,759,080 top quality games

    Wednesday 11th September 2024

  • September 2024 Tournament CTG Book update, now 32 million positions, with statistics - all analysed with play recommendations
    • Tournament CTG Book with 32,028,077 positions/moves and 1,875,823 variations based on 1,759,080 top quality games

    Sunday 1st September 2024

  • September 2024 Online Book Access update, over 122 million positions with statistics - all positions and moves deeply analysed with play recommendations.
    • Human Reference book 62,113,791 positions/moves, 2,708,451 variations based on 2,194,926 high quality human games
    GM++ top human chess book: 29,051,793 positions/moves, 1,283,449 variations based on 1,117,933 GM human games
    Tournament Book with 31,157,316 positions/moves and 1,818,856 variations based on 1,705,014 top quality games

    Thursday 15th August 2024

  • Mid August 2024 Online Book Access update, over 122 million positions with statistics - all positions and moves deeply analysed with play recommendations.
    • Human Reference book 62,078,340 positions/moves, 2,706,866 variations based on 2,193,738 high quality human games
    GM++ top human chess book: 29,038,836 positions/moves, 1,282,914 variations based on 1,117,506 GM human games
    Tournament Book with 31,157,316 positions/moves and 1,818,856 variations based on 1,705,014 top quality games

    Thursday 1st August 2024

  • August 2024 Online Book Access update, over 122 million positions with statistics - all positions and moves deeply analysed with play recommendations.
    • Human Reference book 61,974,485 positions/moves, 2,701,432 variations based on 2,189,320 high quality human games
    GM++ top human chess book: 28,965,079 positions/moves, 1,278,848 variations based on 1,114,031 GM human games
    Tournament Book with 31,157,316 positions/moves and 1,818,856 variations based on 1,705,014 top quality games

    Monday 15th July 2024

  • Mid July 2024 Online Book Access update, over 121 million positions with statistics - all positions and moves deeply analysed with play recommendations.
    • Human Reference book 61,824,266 positions/moves, 2,693,935 variations based on 2,183,174 high quality human games
    GM++ top human chess book: 28,884,859 positions/moves, 1,274,547 variations based on 1,110,386 GM human games
    Tournament Book with 31,157,316 positions/moves and 1,818,856 variations based on 1,705,014 top quality games

    Monday 1st July 2024

  • July 2024 Online Book Access update, over 121 million positions with statistics - all positions and moves deeply analysed with play recommendations.
    • Human Reference book 61,781,142 positions/moves, 2,691,994 variations based on 2,181,704 high quality human games
    GM++ top human chess book: 28,871,534 positions/moves, 1,273,955 variations based on 1,103,096 GM human games
    Tournament Book with 31,157,316 positions/moves and 1,818,856 variations based on 1,705,014 top quality games

    Wednesday 19th June 2024

  • Mid June 2024 Tournament CTG Book update, now 31.7 million positions, with statistics - all analysed with play recommendations
    • Tournament CTG Book with 31,747,976 positions/moves and 1,857,872 variations based on 1,738,579 top quality games
  • Mid June 2024 Online Book Access update, now over 122 million positions with statistics - all positions and moves deeply analysed with play recommendations.


    • Saturday 15th June 2024

  • Mid June 2024 Online Book Access update, over 121 million positions with statistics - all positions and moves deeply analysed with play recommendations.
    • Human Reference book 61,680,124 positions/moves, 2,686,802 variations based on 2,173,649 high quality human games
    GM++ top human chess book: 28,807,609 positions/moves, 1,270,459 variations based on 1,103,096 GM human games
    Tournament Book with 31,157,316 positions/moves and 1,818,856 variations based on 1,705,014 top quality games

    Saturday 1st June 2024

  • June 2024 Online Book Access update, over 121 million positions with statistics - all positions and moves deeply analysed with play recommendations.
    • Human Reference book 61,486,802 positions/moves, 2,657,927 variations based on 2,157,991 high quality human games
    GM++ top human chess book: 28,725,546 positions/moves, 1,258,063 variations based on 1,107,821 GM human games
    Tournament Book with 31,157,316 positions/moves and 1,818,856 variations based on 1,705,014 top quality games

    Wednesday 1st May 2024

  • May 2024 Online Book Access update, over 121 million positions with statistics - all positions and moves deeply analysed with play recommendations.
    • Human Reference book 61,280,180 positions/moves, 2,650,545 variations based on 2,137,850 high quality human games
    GM++ top human chess book: 28,614,659 positions/moves, 1,255,035 variations based on 1,090,971 GM human games
    Tournament Book with 31,157,316 positions/moves and 1,818,856 variations based on 1,705,014 top quality games

    Monday 22nd April 2024

  • Mid April 2024 Online Book Access update, over 121 million positions with statistics - all positions and moves deeply analysed with play recommendations.
    • Human Reference book 61,246,233 positions/moves, 2,649,069 variations based on 2,136,745 high quality human games
    GM++ top human chess book: 28,603,625 positions/moves, 1,254,566 variations based on 1,090,609 GM human games
    Tournament Book with 31,157,316 positions/moves and 1,818,856 variations based on 1,705,014 top quality games

    Monday 1st April 2024

  • April 2024 Online Book Access update, over 120 million positions with statistics - all positions and moves deeply analysed with play recommendations.
    • Human Reference book 61,116,155 positions/moves, 2,642,386 variations based on 2,131,266 high quality human games
    GM++ top human chess book: 28,520,806 positions/moves, 1,250,038 variations based on 1,086,715 GM human games
    Tournament Book with 31,157,316 positions/moves and 1,818,856 variations based on 1,705,014 top quality games

    Saturday 16th March 2024

  • Mid March 2024 Tournament CTG Book update, now 31.4 million positions, with statistics - all analysed with play recommendations
    • Tournament CTG Book with 31,397,311 positions/moves and 1,833,692 variations based on 1,717,647 top quality games
  • Mid March 2024 Online Book Access update, over 120 million positions with statistics - all positions and moves deeply analysed with play recommendations.
    • Human Reference book 61,086,392 positions/moves, 2,641,100 variations based on 2,130,283 high quality human games
    GM++ top human chess book: 28,512,678 positions/moves, 1,249,667 variations based on 1,086,440 GM human games
    Tournament Book with 31,397,311 positions/moves and 1,833,692 variations based on 1,717,647 top quality games

    Friday, 1st March 2024

  • HIARCS Chess Explorer Pro v1.3.3 released with HCE Pro 1.3.3 on macOS and HCE Pro 1.3.3 on PC Windows
    • Supports Windows 10 and 11; macOS 11 BigSur and later including latest macOS Sonoma
    Separate download available to support older Windows 7 and macOS 10.14 Mojava and Catalina.
    Key improvements include:

    New stronger HIARCS 15.3.1 chess engine
    Much deeper game analysis from H15.3.1
    Game analysis includes opening book annotations
    Enhanced position analysis views and variation depth with H15.3.1
    Improved position learning
    Improved handicap levels in game play
    Bulk game analysis improvements
    New stronger engine opening book
    Improved resignation handling
    Enhanced tablebase explorer dialog
    Automatically backup database before compaction
    eBoard sync during replay game
    Improved live game support
    Improved database search including variations
    Enhanced database import for cyrillic
    Improved PGN handling for invalid formats
    Engine match fix for play from database
    Enhanced non-admin user installation
    Other minor enhancements



    Friday 1st March 2024

  • March 2024 Online Book Access update, over 120 million positions with statistics - all positions and moves deeply analysed with play recommendations.
    • Human Reference book 60,969,113 positions/moves, 2,635,174 variations based on 2,125,481 high quality human games
    GM++ top human chess book: 28,450,147 positions/moves, 1,246,196 variations based on 1,083,510 GM human games
    Tournament Book with 31,157,316 positions/moves and 1,818,856 variations based on 1,705,014 top quality games

    Friday, 23rd February 2024

  • HIARCS Chess Explorer Pro v1.3.2 released with HCE Pro 1.3.2 on macOS and HCE Pro 1.3.2 on PC Windows
    • Supports Windows 10 and 11; macOS 11 BigSur and later including latest macOS Sonoma
    Separate download available to support older Windows 7 and macOS 10.14 Mojava and Catalina.
    Key improvements include:

    New stronger HIARCS 15.3.1 chess engine
    Much deeper game analysis from H15.3.1
    Game analysis includes opening book annotations
    Enhanced position analysis views and variation depth with H15.3.1
    Improved position learning
    Improved handicap levels in game play
    Bulk game analysis improvements
    New stronger engine opening book
    Improved resignation handling
    Enhanced tablebase explorer dialog
    Automatically backup database before compaction
    eBoard sync during replay game
    Improved live game support
    Improved database search including variations
    Enhanced database import for cyrillic
    Other minor enhancements



    Friday, 16th February 2024

  • HIARCS Chess Explorer Pro v1.3.1 released with HCE Pro 1.3.1 on macOS and HCE Pro 1.3.1 on PC Windows
    • Key improvements include:

    New stronger HIARCS 15.3 chess engine
    Much deeper game analysis from H15.3
    Game analysis includes opening book annotations
    Enhanced position analysis views and variation depth with H15.3
    Improved handicap levels in game play
    Bulk game analysis improvements
    New stronger engine opening book
    Improved resignation handling
    Enhanced tablebase explorer dialog
    Automatically backup database before compaction
    eBoard sync during replay game
    Improved live game support
    Improved database search including variations
    Enhanced database import for cyrillic
    Other minor enhancements



    Thursday 1st February 2024

  • February 2024 Online Book Access update, around 120 million positions with statistics - all positions and moves deeply analysed with play recommendations. New books include the 86th Tata Steel 2024 games downloadable for customers.
    • Human Reference book 60,515,728 positions/moves, 2,614,223 variations based on 2,109,688 high quality human games
    GM++ top human chess book: 28,281,647 positions/moves, 1,238,053 variations based on 1,077,066 GM human games
    Tournament Book with 31,157,316 positions/moves and 1,818,856 variations based on 1,705,014 top quality games

    Tuesday 16th January 2024

  • mid January 2024 Online Book Access update, around 120 million positions with statistics - all positions and moves deeply analysed with play recommendations. New books include the strongest games from the 2023 Rapid and Blitz World Championships, downloadable for customers.
    • Human Reference book 60,188,446 positions/moves, 2,599,996 variations based on 2,099,729 high quality human games
    GM++ top human chess book: 28,288,890 positions/moves, 1,238,256 variations based on 1,077,211 GM human games
    Tournament Book with 31,157,316 positions/moves and 1,818,856 variations based on 1,705,014 top quality games

    Monday, 1st January 2024

  • January 2024 Online Book Access update, around 120 million positions with statistics - all positions and moves deeply analysed with play recommendations. New books include the strongest games from the 2023 Rapid and Blitz World Championships, downloadable for customers.
    • Human Reference book 60,110,541 positions/moves, 2,595,892 variations based on 2,096,336 high quality human games
    GM++ top human chess book: 28,230,145 positions/moves, 1,235,030 variations based on 1,074,449 GM human games
    Tournament Book with 31,157,316 positions/moves and 1,818,856 variations based on 1,705,014 top quality games

    Friday, 15th December 2023

  • Mid December 2023 Online Book Access update, around 120 million positions with statistics - all positions and moves deeply analysed with play recommendations
    • Human Reference book 60,043,251 positions/moves, 2,592,899 variations based on 2,094,124 high quality human games
    GM++ top human chess book: 28,217,459 positions/moves, 1,234,496 variations based on 1,074,054 GM human games
  • Mid December 2023 Tournament CTG Book update, now over 31 million positions, with statistics - all analysed with play recommendations
    • Tournament CTG Book with 31,157,316 positions/moves and 1,818,856 variations based on 1,705,014 top quality games

    Friday, 1st December 2023

  • December 2023 Online Book Access update, over 122 million positions with statistics - all positions and moves deeply analysed with play recommendations
    • Human Reference book 59,933,758 positions/moves, 2,587,443 variations based on 2,089,798 high quality human games
    GM++ top human chess book: 28,155,031 positions/moves, 1,231,187 variations based on 1,071,316 GM human games
    Tournament Book with 34,469,699 positions/moves and 2,040,450 variations based on 1,817,696 top quality games

    Wednesday, 15th November 2023

  • mid November 2023 Online Book Access update, over 122 million positions with statistics - all positions and moves deeply analysed with play recommendations
    • Human Reference book 59,878,037 positions/moves, 2,584,983 variations based on 2,087,895 high quality human games
    GM++ top human chess book: 28,133,736 positions/moves, 1,230,262 variations based on 1,070,593 GM human games
    Tournament Book with 34,469,699 positions/moves and 2,040,450 variations based on 1,817,696 top quality games

    Wednesday, 1st November 2023

  • November 2023 Online Book Access update, over 122 million positions with statistics - all positions and moves deeply analysed with play recommendations
    • Human Reference book 59,782,581 positions/moves, 2,579,994 variations based on 2,083,687 high quality human games
    GM++ top human chess book: 28,060,431 positions/moves, 1,226,295 variations based on 1,067,168 GM human games
    Tournament Book with 34,469,699 positions/moves and 2,040,450 variations based on 1,817,696 top quality games

    Sunday, 15th October 2023

  • mid October 2023 Online Book Access update, over 122 million positions with statistics (over 1 million added!) - all positions and moves deeply analysed with play recommendations
    • Human Reference book 59,714,811 positions/moves, 2,576,992 variations based on 2,081,362 high quality human games
    GM++ top human chess book: 28,031,782 positions/moves, 1,225,043 variations based on 1,066,204 GM human games
    Tournament Book with 34,469,699 positions/moves and 2,040,450 variations based on 1,817,696 top quality games

    Sunday, 1st October 2023

  • October 2023 Online Book Access update, over 121 million positions with statistics - all positions and moves deeply analysed with play recommendations
    • Human Reference book 58,725,914 positions/moves, 2,533,360 variations based on 2,049,831 high quality human games
    GM++ top human chess book: 27,829,146 positions/moves, 1,215,763 variations based on 1,059,079 GM human games
    Tournament Book with 34,469,699 positions/moves and 2,040,450 variations based on 1,817,696 top quality games

    Tuesday, 26th September 2023

  • Apple has released the new macOS 14 Sonoma. The good news is our products already support macOS 14 Sonoma and we have tested them with the latest available macOS Sonoma. HIARCS Chess Software has been supporting Apple Mac OS since 1995.

    • Friday, 1st September 2023

  • September 2023 Online Book Access update, over 120 million positions with statistics - all positions and moves deeply analysed with play recommendations
    • Human Reference book 58,551,773 positions/moves, 2,525,138 variations based on 2,043,375 high quality human games
    GM++ top human chess book: 27,748,281 positions/moves, 1,211,698 variations based on 1,055,690 GM human games
    Tournament Book with 34,469,699 positions/moves and 2,040,450 variations based on 1,817,696 top quality games

    Saturday, 26th August 2023

  • September 2023 Tournament CTG Book update, now over 34.5 million positions, with statistics - all analysed with play recommendations
    • Tournament CTG Book with 34,469,699 positions/moves and 2,040,450 variations based on 1,817,696 top quality games

    Wednesday, 16th August 2023

  • Mid August 2023 Online Book Access update, over 120 million positions, with statistics - all analysed with play recommendations
    • Human Reference book 58,514,938 positions/moves, 2,523,541 variations based on 2,042,135 high quality human games
    GM++ top human chess book: 27,737,509 positions/moves, 1,211,237 variations based on 1,055,332 GM human games

    Saturday, 5th August 2023

  • update to HIARCS Chess Explorer Pro v1.2.1 released with HCE Pro 1.2.1 on macOS and HCE Pro 1.2.1 on PC Windows
    • Key improvements include:

      Improved engine book
      Improved annotations during game analysis
      Enhanced database compaction checks
      Remove index when asked to forget database
      Support localized piece names and letters based on HCE Pro language setting
      Improved Database->Find position
      Other minor enhancements

    Tuesday, 1st August 2023

  • August 2023 Online Book Access update, over 120 million positions, with statistics - all analysed with play recommendations
    • Human Reference book 58,400,762 positions/moves, 2,517,924 variations based on 2,037,489 high quality human games
    GM++ top human chess book: 27,657,893 positions/moves, 1,207,163 variations based on 1,051,860 GM human games
    Tournament book with 35,768,257 positions/moves and 2,120,477 variations based on 1,892,610 top quality games

    Wednesday, 19th July 2023

  • Major 2023 update to HIARCS Chess Explorer Pro v1.2 released with HCE Pro 1.2 on macOS and HCE Pro 1.2 on PC Windows
    • Key improvements include:

      New HIARCS 15.2 engines with about 50 Elo strength improvement

      Improved positional play, book and position learning
      Improved handicap weaker levels with Set Elo, improved Elo simulation accuracy
      Optional Fortress detection in analysis for Premium customers
      New 2023 Local and engine opening books

      New 2023 MasterBase23 database with over 575,000 high quality games

      New support for Millennium eBoards

      Analyse on a physical electronic chess board
      Play games against the computer using the eBoard
      Supports natural piece movement, sliding pieces, adjusting moves, exchanging pieces

      Improved search functions

      Improved quick search expressions
      Faster searching and extra parameters
      New negated quick search using !

      Improved database, import and export capabilities

      Import multiple databases at once
      Detect more ChessBase symbols on CBH/CBV import
      Improved support for ChessBase CTG books
      Export improvements for PGN/EPUB/CSV/HTML/PDF
      Improved support for ISO-8859-1 databases
      Auto recovery of databases

    • Improved user interface features

      • Faster start up with many tabs open
      Improved Player Explorer and opening reports
      New evaluation and best move shortcut icons
      Improved evaluation graph strength and quick click navigation
      Extra book and tree views, view mulitple books and databases at once
      Improved Analysis, caching and highlighting important lines
      Improved Annotation of book lines and missed blunders
      Click source and destination squares to move
      Improved browsing of trees and games
      Improved Game List sorting
      Improved Live Game viewing
      Optional store clock usage in engine match
      Restore Play game opening and store clocks
      Improved Puzzle mode, hides result and variations
      Configurable diagram size for HTML/PDF
      Show figurines in Endgame Tablebase navigation
      Improved support for Windows scaling and dual monitor resolutions and scaling differences
      Improved Print fonts and diagram sizes

      Numerous other fixes and enhancements

    Saturday, 1st July 2023

  • July 2023 Online Book Access update, over 120 million positions, with statistics - all analysed with play recommendations
    • Human Reference book 58,238,325 positions/moves, 2,510,244 variations based on 2,031,435 high quality human games
    GM++ top human chess book: 27,577,650 positions/moves, 1,203,042 variations based on 1,048,543 GM human games
    Tournament book with 35,768,257 positions/moves and 2,120,477 variations based on 1,892,610 top quality games

    Thursday, 1st June 2023

  • June 2023 Online Book Access update, over 120 million positions, with statistics - all analysed with play recommendations
    • Human Reference book 58,085,906 positions/moves, 2,502,838 variations based on 2,025,665 high quality human games
    GM++ top human chess book: 27,509,749 positions/moves, 1,199,475 variations based on 1,045,617 GM human games
    Tournament book with 35,768,257 positions/moves and 2,120,477 variations based on 1,892,610 top quality games

    Wednesday, 24th May 2023

  • May 2023 Tournament CTG Book update, now over 35.7 million positions, with statistics - all analysed with play recommendations
    • Tournament CTG Book with 35,768,194 positions/moves and 1,892,610 variations based on 2,012,477 top quality games

    Monday 1st May 2023

  • May 2023 Online Book Access update, over 120 million positions, with statistics - all analysed with play recommendations
    • Human Reference book 57,927,447 positions/moves, 2,495,182 variations based on 2,019,397 high quality human games
    GM++ top human chess book: 27,406,754 positions/moves, 1,194,291 variations based on 1,041,235 GM human games
    Tournament book with 35,328,859 positions/moves and 2,176,516 variations based on 2,012,477 top quality games

    Saturday 1st April 2023

  • April 2023 Online Book Access update, over 119 million positions, with statistics - all analysed with play recommendations
    • Human Reference book 57,402,741 positions/moves, 2,468,832 variations based on 1,997,747 high quality human games
    GM++ top human chess book: 26,923,635 positions/moves, 1,170,007 variations based on 1,021,124 GM human games
    Tournament book with 35,328,859 positions/moves and 2,176,516 variations based on 2,012,477 top quality games

    Wednesday 1st March 2023

  • March 2023 Online Book Access update, over 119 million positions, with statistics - all analysed with play recommendations
    • Human Reference book 57,216,868 positions/moves, 2,460,057 variations based on 1,990,786 high quality human games
    GM++ top human chess book: 26,833,515 positions/moves, 1,165,487 variations based on 1,017,340 GM human games
    Tournament book with 35,328,859 positions/moves and 2,176,516 variations based on 2,012,477 top quality games

    Tuesday, 21st February 2023

  • March 2023 Tournament CTG Book update, now over 35.3 million positions, with statistics - all analysed with play recommendations
    • Tournament CTG Book with 35,328,859 positions/moves and 2,176,516 variations based on 2,012,477 top quality games

    Wednesday 1st February 2023

  • February 2023 Online Book Access update, over 118 million positions, with statistics - all analysed with play recommendations
    • Human Reference book 57,079,081 positions/moves, 2,453,185 variations based on 1,985,203 high quality human games
    GM++ top human chess book: 26,745,311 positions/moves, 1,160,842 variations based on 1,013,427 GM human games
    Tournament book with 34,901,500 positions/moves and 2,146,514 variations based on 1,984,592 top quality games

    Saturday, 14th January 2023

  • Mid January 2023 Online Book Access update, over 118 million positions, with statistics - all analysed with play recommendations
    • Human Reference book 56,986,044 positions/moves, 2,449,307 variations based on 1,982,872 high quality human games
    GM++ top human chess book: 26,776,567 positions/moves, 1,162,271 variations based on 1,014,647 GM human games
    Tournament book with 34,901,500 positions/moves and 2,146,514 variations based on 1,984,592 top quality games

    Sunday, 1st January 2023

  • January 2023 Online Book Access update, over 118 million positions, with statistics - all analysed with play recommendations
    • Human Reference book 56,766,040 positions/moves, 2,438,934 variations based on 1,975,213 high quality human games
    GM++ top human chess book: 26,695,818 positions/moves, 1,158,058 variations based on 1,011,350 GM human games
    Tournament book with 34,901,500 positions/moves and 2,146,514 variations based on 1,984,592 top quality games

    Thursday, 15th December 2022

  • Mid December 2022 Online Book Access update, over 118 million positions, with statistics - all analysed with play recommendations
    • Human Reference book 56,529,121 positions/moves, 2,415,932 variations based on 1,952,016 high quality human games
    GM++ top human chess book: 26,628,213 positions/moves, 1,149,680 variations based on 1,001,646 GM human games
    Tournament book with 34,901,500 positions/moves and 2,146,514 variations based on 1,984,592 top quality games

    Thursday, 1st December 2022

  • December 2022 Online Book Access update, over 117 million positions, with statistics - all analysed with play recommendations
    • Human Reference book 56,442,561 positions/moves, 2,411,553 variations based on 1,948,450 high quality human games
    GM++ top human chess book: 26,568,854 positions/moves, 1,146,504 variations based on 999,016 GM human games
    Tournament book with 34,901,500 positions/moves and 2,146,514 variations based on 1,984,592 top quality games

    Monday, 21st November 2022

  • HIARCS 15.2 outright winner of 58th CSVN Tournament with 9/10, +8=2-0

    • Tuesday, 8th November 2022

  • November 2022 Tournament CTG Book update over 34.9 million positions, with statistics - all analysed with play recommendations
    • Tournament CTG Book with 34,901,500 positions/moves and 2,146,514 variations based on 1,984,592 top quality games

    Tuesday, 1st November 2022

  • November 2022 Online Book Access update, over 116 million positions, with statistics - all analysed with play recommendations
    • Human Reference book 56,402,259 positions/moves, 2,409,068 variations based on 1,946,068 high quality human games
    GM++ top human chess book: 26,550,159 positions/moves, 1,144,817 variations based on 997,468 GM human games
    Tournament book with 33,448,168 positions/moves and 2,043,808 variations based on 1,874,732 top quality games

    Saturday, 15th October 2022

  • Mid October 2022 Online Book Access update, over 116 million positions, with statistics - all analysed with play recommendations
    • Human Reference book 56,334,847 positions/moves, 2,406,099 variations based on 1,943,815 high quality human games
    GM++ top human chess book: 26,528,995 positions/moves, 1,143,898 variations based on 996,755 GM human games
    Tournament book with 33,448,168 positions/moves and 2,043,808 variations based on 1,874,732 top quality games

    Monday, 3rd October 2022

  • Updated iPhone HIARCS Chess version 13.88 released
  • Updated iPad HIARCS Chess version 13.8.9 released

    • Saturday, 1st October 2022

  • October 2022 Online Book Access update, over 116 million positions, with statistics - all analysed with play recommendations
    • Human Reference book 56,251,757 positions/moves, 2,401,838 variations based on 1,940,316 high quality human games
    GM++ top human chess book: 26,466,770 positions/moves, 1,140,582 variations based on 993,966 GM human games
    Tournament book with 33,448,168 positions/moves and 2,043,808 variations based on 1,874,732 top quality games

    Saturday, 10th September 2022

  • Updated iPhone HIARCS Chess version 13.86 released
  • Updated iPad HIARCS Chess version 13.8.6 released

    • Thursday, 1st September 2022

  • September 2022 Online Book Access update, over 115 million positions, with statistics - all analysed with play recommendations
    • Human Reference book 56,074,043 positions/moves, 2,393,486 variations based on 1,934,927 high quality human games
    GM++ top human chess book: 26,379,155 positions/moves, 1,136,204 variations based on 990,974 GM human games
    Tournament book with 33,448,168 positions/moves and 2,043,808 variations based on 1,874,732 top quality games

    Friday, 26th August 2022

  • HIARCS Chess Explorer v1.12.2 free customer update for Apple Mac OS X now available

    • Monday, 15th August 2022

  • Mid August 2022 Online Book Access update, over 115 million positions, with statistics - all analysed with play recommendations
    • Human Reference book 56,011,221 positions/moves, 2,390,767 variations based on 1,931,609 high quality human games
    GM++ top human chess book: 26,359,169 positions/moves, 1,135,372 variations based on 989,672 GM human games
    Tournament CTG book with 33,448,168 positions/moves and 2,043,808 variations based on 1,874,732 top quality games

    Monday, 1st August 2022

  • August 2022 Online Book Access update, over 114 million positions, with statistics - all analysed with play recommendations
    • Human Reference book 55,698,541 positions/moves, 2,374,239 variations based on 1,917,030 high quality human games
    GM++ top human chess book: 25,685,813 positions/moves, 1,100,414 variations based on 959,475 GM human games
    Tournament CTG book with 33,448,168 positions/moves and 2,043,808 variations based on 1,874,732 top quality games

    Wednesday, 13th July 2022

  • HIARCS Chess Explorer v1.12.1 free customer update for Apple Mac OS X now available

    • Friday, 1st July 2022

  • July 2022 Online Book Access update, over 113 million positions, with statistics - all analysed with play recommendations
    • Human Reference book 55,129,132 positions/moves, 2,345,551 variations based on 1,893,381 high quality human games
    GM++ top human chess book: 25,573,781 positions/moves, 1,094,782 variations based on 954,891 GM human games
    Tournament CTG book with 32,736,668 positions/moves and 2,002,736 variations based on 1,840,802 top quality games

    Monday, 6th June 2022

  • HIARCS Chess Explorer v1.12 free customer update for Apple Mac OS X now available

    • Wednesday, 1st June 2022

  • June 2022 Online Book Access update, over 113 million positions, with statistics - all analysed with play recommendations
    • Human Reference book 54,955,154 positions/moves, 2,337,274 variations based on 1,886,727 high quality human games
    GM++ top human chess book: 25,469,902 positions/moves, 1,089,576 variations based on 950,568 GM human games
    Tournament CTG book with 32,736,668 positions/moves and 2,002,736 variations based on 1,840,802 top quality games

    Monday, 17th May 2022

  • HIARCS 15.1 joint winner of 57th CSVN Programmers Tournament

    • Tuesday, 10th May 2022

  • HIARCS Chess Explorer Pro v1.1 update released for macOS and PC Windows

      • Key improvements include:

      New HIARCS 15.1 engines with improved strength and multi-core support
      Updated 2022 opening books
      Updated 2022 MasterBase database
      Improved Annotation display
      Improved support for ChessBase CTG books
      Improved support for Unicode and figurines in ChessBase CBH databases
      Improved copy and paste functions
      Improved export to EPUB
      Engine match enhancements
      New language translations
      Auto recovery of databases after restart
      Skip p with different names or results
      Show existing comments in Puzzle mode
      Numerous other fixes and enhancements

    Sunday, 1st May 2022

  • May 2022 Online Book Access update, over 113 million positions, with statistics - all analysed with play recommendations
    • Human Reference book 55,184,994 positions/moves, 2,349,579 variations based on 1,897,360 high quality human games
    GM++ top human chess book: 25,757,735 positions/moves, 1,104,328 variations based on 962,983 GM human games
    Tournament CTG book with 32,736,668 positions/moves and 2,002,736 variations based on 1,840,802 top quality games

    Friday, 22nd April 2022

  • mid April 2022 Online Book Access update, over 113 million positions, with statistics - all analysed with play recommendations
    • Human Reference book 55,122,706 positions/moves, 2,346,895 variations based on 1,895,325 high quality human games
    GM++ top human chess book: 25,733,081 positions/moves, 1,103,307 variations based on 962,203 GM human games
    Tournament CTG book with 32,736,668 positions/moves and 2,002,736 variations based on 1,840,802 top quality games

    Friday, 1st April 2022

  • April 2022 Online Book Access update, over 111 million positions, with statistics - all analysed with play recommendations
    • Human Reference book 55,097,339 positions/moves, 2,345,056 variations based on 1,893,017 high quality human games
    GM++ top human chess book: 25,670,452 positions/moves, 1,099,712 variations based on 958,882 GM human games
    Tournament CTG book with 30,604,733 positions/moves and 1,895,525 variations based on 1,754,460 top quality games

    Tuesday, 1st March 2022

  • March 2022 Online Book Access update, over 111 million positions, with statistics - all analysed with play recommendations
    • Human Reference book 54,959,509 positions/moves, 2,338,573 variations based on 1,887,670 high quality human games
    GM++ top human chess book: 25,578,451 positions/moves, 1,095,526 variations based on 955,116 GM human games
    Tournament CTG book with 30,604,733 positions/moves and 1,895,525 variations based on 1,754,460 top quality games

    Tuesday, 1st February 2022

  • February 2022 Online Book Access update, over 110 million positions, with statistics - all analysed with play recommendations
    • Human Reference book 54,844,113 positions/moves, 2,332,770 variations based on 1,882,934 high quality human games
    GM++ top human chess book: 25,486,742 positions/moves, 1,090,539 variations based on 951,196 GM human games
    Tournament CTG book with 30,604,733 positions/moves and 1,895,525 variations based on 1,754,460 top quality games

    Wednesday, 5th January 2022

  • HIARCS Chess Explorer Pro released for macOS and PC Windows
    • HIARCS Chess Explorer Pro is a new highly advanced chess database, analysis and playing program for PC Windows and Apple Mac computers. It offers a very powerful user interface with the strongest ever HIARCS chess engine and world class chess database features. This unique combination offers easy to use features managing chess databases, preparation, analysis, play and training for players of all abilities from beginner to Grandmasters and beyond.

    Key features include:

      Advanced Database Support

      HCE database format offers huge databases only limited by memory - 1GB per 8 million games
      Fast searching for players, openings, events, material, pawn structure and positions.
      Comprehensive game database support (PGN, HCE, reads Chessbase CBH, CBV and EPD)
      Extensive game notation with variations, comments, symbols, diagrams and named openings
      Export and publish your work, games and preparation to PGN, PDF, EPUB e-book and HTML
      Reference databases, manage databases, duplicate search and clean up, watch live games

      HIARCS 15 chess engine – more than 200 Elo stronger

      Full range of realistic set Elo levels with human like playing style, have your strength matched
      Very strong analysis & play, more than 200 Elo stronger than HIARCS 14 WCSC engine
      Supports up to 32† threads/cores, and any UCI Chess User Interface (Chessbase/Fritz)

      Player Explorer

      View reports on players, their games, performances and favourite openings and statistics
      Build tree of games and openings of players instantly into a player report with a single click
      Automated repertoire summaries for databases and players. Merge misspelled players

      Game, Opening and Tree Explorers

      Revolutionary multi-source chess trees with moves, statistics from games and advice
      Build an opening repertoire tree instantly from database games to learn and prepare openings
      Access huge online opening books, view multiple books & Chessbase CTG books simultaneously

      Analysis and Evaluation Explorers

      Analyse positions and games with multiple engines simultaneously with load management
      Multiple lines of analysis with stats, move selection and integrate analysis with game notation
      Check games for blunders, inaccuracies and improvements with post game analysis

      Custom Playing modes

      Play against the computer with human-like play and full range of handicap Elo levels
      Choose rating, time controls, start positions and even chess openings and Chess960 for practice
      Train with the guess the move feature, learn and improve your tactical and positional play
      Coach points out mistakes, shows move quality and hints. Rates your play in Elo points
      Engine matches – set up and watch them play or have them play out test or analysis positions

      Packaged Databases

      Top quality database with 300,000+ Master games, IM/GM annotated games, tactical exercises
      Online access to up over to 1,000 GB of endgame tablebases and opening book databases
      Local book with latest GM Theory and access to much larger online books

    Saturday, 1st January 2021

  • January 2022 Online Book Access update, over 108 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 54,850,343 positions/moves, 2,336,837 variations based on 1,890,150 high quality human games
    GM++ Top Human Chess Book: 25,634,190 positions/moves, 1,100,618 variations based on 962,620 GM human games
    Tournament CTG Book with 28,323,677 positions/moves and 1,755,342 variations based on 1,727,883 top quality games

    Wednesday, 15th December 2021

  • Mid December 2021 Online Book Access update, over 108 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 54,773,992 positions/moves, 2,333,587 variations based on 1,887,809 high quality human games
    GM++ Top Human Chess Book: 25,613,185 positions/moves, 1,099,766 variations based on 961,996 GM human games
    Tournament CTG Book with 28,323,677 positions/moves and 1,755,342 variations based on 1,727,883 top quality games

    Wednesday, 1st December 2021

  • December 2021 Online Book Access update, over 108 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 54,318,575 positions/moves, 2,309,448 variations based on 1,867,364 high quality human games
    GM++ Top Human Chess Book: 25,106,876 positions/moves, 1,074,657 variations based on 940,346 GM human games
    Tournament CTG Book with 28,323,677 positions/moves and 1,755,342 variations based on 1,727,883 top quality games

    Monday, 15th November 2021

  • Mid November 2021 Online Book Access update, over 107 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 54,137,733 positions/moves, 2,299,815 variations based on 1,859,228 high quality human games
    GM++ Top Human Chess Book: 24,944,386 positions/moves, 1,064,993 variations based on 929,670 GM human games
    Tournament CTG Book with 28,323,677 positions/moves and 1,755,342 variations based on 1,727,883 top quality games

    Monday, 1st November 2021

  • November 2021 Online Book Access update, over 107 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 54,065,531 positions/moves, 2,296,082 variations based on 1,856,083 high quality human games
    GM++ Top Human Chess Book: 24,880,981 positions/moves, 1,061,687 variations based on 929,833 GM human games
    Tournament CTG Book with 28,323,677 positions/moves and 1,755,342 variations based on 1,727,883 top quality games

    Saturday, 23rd October 2021

  • HIARCS Chess Explorer v1.11 free customer update for Apple Mac OS X now available
  • HIARCS Chess Explorer v1.11 free customer update for PC Windows now available

    • Monday, 18th October 2021

  • Mid October 2021 Online Book Access update, over 107 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 54,003,464 positions/moves, 2,293,378 variations based on 1,854,025 high quality human games
    GM++ Top Human Chess Book: 24,798,818 positions/moves, 1,057,572 variations based on 929,104 GM human games

    Monday, 4th October 2021

  • October 2021 Tournament CTG Book update over 29.4 million positions, with statistics - all analysed with play recommendations
    • Tournament CTG Book with 29,465,051 positions/moves and 1,813,194 variations based on 1,777,433 top quality games
  • Updated iPhone HIARCS Chess version 13.85 released
  • Updated iPad HIARCS Chess version 13.8.5 released

    • Friday, 1st October 2021

  • October 2021 Online Book Access update, over 106 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 53,940,300 positions/moves, 2,290,070 variations based on 1,851,045 high quality human games
    GM++ Top Human Chess Book: 24,798,818 positions/moves, 1,057,572 variations based on 926,9376 GM human games
    Tournament CTG Book with 28,323,677 positions/moves and 1,755,342 variations based on 1,727,883 top quality games

    Wednesday, 1st September 2021

  • September 2021 Online Book Access update, over 106 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 53,687,385 positions/moves, 2,2748,709 variations based on 1,839,878 high quality human games
    GM++ Top Human Chess Book: 24,605,590 positions/moves, 1,048,335 variations based on 918,855 GM human games
    Tournament CTG Book with 28,323,677 positions/moves and 1,755,342 variations based on 1,727,883 top quality games

    Sunday, 1st August 2021

  • August 2021 Online Book Access update, over 106 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 53,606,911 positions/moves, 2,274,630 variations based on 1,839,878 high quality human games
    GM++ Top Human Chess Book: 24,605,590 positions/moves, 1,048,335 variations based on 918,855 GM human games
    Tournament CTG Book with 28,323,677 positions/moves and 1,755,342 variations based on 1,727,883 top quality games

    Saturday, 24th July 2021

  • July 2021 Tournament CTG Book update over 28.3 million positions, with statistics - all analysed with play recommendations
    • Tournament CTG Book with 28,323,677 positions/moves and 1,755,342 variations based on 1,727,883 top quality games

    Saturday, 17th July 2021

  • Mid July 2021 Online Book Access update, over 106 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 53,524,576 positions/moves, 2,271,123 variations based on 1,836,049 high quality human games
    GM++ Top Human Chess Book: 24,582,225 positions/moves, 1,047,391 variations based on 918,067 GM human games
    Tournament CTG Book with 28,039,830 positions/moves and 1,617,579 variations based on 1,4749,503 top quality games

    Thursday, 1st July 2021

  • July 2021 Online Book Access update, over 106 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 53,481,097 positions/moves, 2,268,666 variations based on 1,833,750 high quality human games
    GM++ Top Human Chess Book: 24,515,689 positions/moves, 1,043,914 variations based on 915,097 GM human games
    Tournament CTG Book with 28,039,830 positions/moves and 1,617,579 variations based on 1,4749,503 top quality games

    Tuesday, 1st June 2021

  • June 2021 Online Book Access update, over 106 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 53,527,019 positions/moves, 2,323,226 variations based on 1,826,591 high quality human games
    GM++ Top Human Chess Book: 24,411,502 positions/moves, 1,038,967 variations based on 911,153 GM human games
    Tournament CTG Book with 28,039,830 positions/moves and 1,617,579 variations based on 1,4749,503 top quality games

    Monday, 25th May 2021

  • HIARCS Chess Explorer v1.10.1 free customer update for Apple Mac OS X now available
  • HIARCS Chess Explorer v1.10.1 free customer update for PC Windows now available

    • Saturday, 1st May 2021

  • May 2021 Online Book Access update, over 106 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 53,420,757 positions/moves, 2,318,030 variations based on 1,822,247 high quality human games
    GM++ Top Human Chess Book: 24,650,604 positions/moves, 1,110,333 variations based on 907,500 GM human games
    Tournament CTG Book with 28,039,830 positions/moves and 1,617,579 variations based on 1,4749,503 top quality games

    Monday, 19th April 2021

  • April 2021 Online Book Access update, over 105.4 million positions, with statistics - all analysed with play recommendations
    • Tournament CTG Book with 28,039,830 positions/moves and 1,617,579 variations based on 1,4749,503 top quality games
    Human Reference Book 53,117,417 positions/moves, 2,251,773 variations based on 1,820,639 high quality human games
    GM++ Top Human Chess Book: 24,309,077 positions/moves, 1,034,020 variations based on 907,048 GM human games

    Saturday, 17th April 2021

  • Mid April 2021 Online Book Access update, over 104 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 53,117,417 positions/moves, 2,251,773 variations based on 1,820,639 high quality human games
    GM++ Top Human Chess Book: 24,309,077 positions/moves, 1,034,020 variations based on 907,048 GM human games
    Tournament CTG Book with 26,631,111 positions/moves and 1,910,946 variations based on 4,962,159 top quality games

    Thursday, 1st April 2021

  • April 2021 Online Book Access update, over 103.8 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 53,086,499 positions/moves, 2,249,760 variations based on 1,818,639 high quality human games
    GM++ Top Human Chess Book: 24,253,715 positions/moves, 1,030,980 variations based on 904,351 GM human games

    Monday, 15th March 2021

  • Mid March 2021 Online Book Access update, over 103.8 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 53,004,006 positions/moves, 2,246,273 variations based on 1,816,090 high quality human games
    GM++ Top Human Chess Book: 24,223,295 positions/moves, 1,029,741 variations based on 903,438 GM human games

    Monday, 1st March 2021

  • March 2021 Online Book Access update, over 103.7 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 52,933,431 positions/moves, 2,242,676 variations based on 1,813,106 high quality human games
    GM++ Top Human Chess Book: 24,163,873 positions/moves, 1,026,667 variations based on 900,831 GM human games

    Wednesday, 17th February 2021

  • Mid February 2021 Online Book Access update, over 103 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 52,923,649 positions/moves, 2,242,254 variations based on 1,812,786 high quality human games
    GM++ Top Human Chess Book: 24,160,792 positions/moves, 1,026,541 variations based on 900,731 GM human games

    Monday, 1st February 2021

  • February 2021 Online Book Access update, over 103 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 52,842,365 positions/moves, 2,237,978 variations based on 1,809,210 high quality human games
    GM++ Top Human Chess Book: 24,082,722 positions/moves, 1,022,459 variations based on 897,293 GM human games

    Monday, 18th January 2021

  • Mid January 2021 Tournament CTG Book update over 26.6 million positions, with statistics - all analysed with play recommendations
    • Tournament CTG Book with 26,631,111 positions/moves and 1,910,946 variations based on 4,962,159 top quality games

  • Mid January 2021 Online Book Access update, over 103 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 52,827,375 positions/moves, 2,237,359 variations based on 1,808,725 high quality human games
    GM++ Top Human Chess Book: 24,076,550 positions/moves, 1,022,213 variations based on 897,102 GM human games

    Friday, 8th January 2021

  • January 2021 Online Book Access update, over 102 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 52,807,748 positions/moves, 2,236,554 variations based on 1,808,105 high quality human games
    GM++ Top Human Chess Book: 24,068,653 positions/moves, 1,021,895 variations based on 896,862 GM human games
    Tournament CTG Book with 24,599,456 positions/moves and 1,917,305 variations based on 4,936,363 top quality games

    Wednesday, 16th December 2020

  • Mid December 2020 Online Book Access update, over 102 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 52,747,098 positions/moves, 2,233,005 variations based on 1,803,001 high quality human games
    GM++ Top Human Chess Book: 24,054,871 positions/moves, 1,020,472 variations based on 893,326 GM human games
    Tournament CTG Book with 24,599,456 positions/moves and 1,917,305 variations based on 4,936,363 top quality games

    Tuesday, 1st December 2020

  • December 2020 Online Book Access update, over 102 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 52,660,763 positions/moves, 2,228,876 variations based on 1,799,633 high quality human games
    GM++ Top Human Chess Book: 23,987,598 positions/moves, 1,017,199 variations based on 890,596 GM human games
    Tournament CTG Book with 24,599,456 positions/moves and 1,917,305 variations based on 4,936,363 top quality games

    Thursday, 26th November 2020

  • Updated iPhone HIARCS Chess version 13.84 released
  • Updated iPad HIARCS Chess version 13.8.4 released

    • Monday, 23rd November 2020

  • November 2020 Online Book Access update, over 101.9 million positions, with statistics - all analysed with play recommendations

    • Sunday, 1st November 2020

  • November 2020 Online Book Access update, over 101.4 million positions, with statistics - all analysed with play recommendations

    • Saturday, 10th October 2020

  • HIARCS Chess Explorer v1.9.5 free customer update for Apple Mac OS X now available
  • HIARCS Chess Explorer v1.9.5 free customer update for PC Windows now available

    • Tuesday, 6th October 2020

  • October 2020 Tournament CTG Book update over 25.4 million positions, with statistics - all analysed with play recommendations
    • Tournament CTG Book with 25,412,066 positions/moves and 1,950,470 variations. Includes statistics from 4,943,505 top quality games

    Thursday, 1st October 2020

  • October 2020 Online Book Access update, over 100.7 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 52,295,476 positions/moves, 2,212,011 variations based on 1,786,725 high quality human games
    GM++ Top Human Chess Book: 23,815,133 positions/moves, 1,008,801 variations based on 883,682 GM human games
    Tournament CTG Book with 24,599,456 positions/moves and 1,917,305 variations based on 4,936,363 top quality games

    Thursday, 15th September 2020

  • Mid September 2020 Online Book Access update, over 100.5 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 52,267,738 positions/moves, 2,210,814 variations based on 1,782,870 high quality human games
    GM++ Top Human Chess Book: 23,799,631 positions/moves, 1,008,155 variations based on 883,190 GM human games
    Tournament CTG Book with 24,599,456 positions/moves and 1,917,305 variations based on 4,936,363 top quality games

    Wednesday, 2nd September 2020

  • September 2020 Online Book Access update, over 100.5 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 52,194,024 positions/moves, 2,2207,209 variations based on 1,782,870 high quality human games
    GM++ Top Human Chess Book: 23,739,971 positions/moves, 1,005,189 variations based on 880,720 GM human games
    Tournament CTG Book with 24,599,456 positions/moves and 1,917,305 variations based on 4,936,363 top quality games

    Thursday, 20th August 2020

  • Mid August 2020 Online Book Access update, over 100.4 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 52,161,849 positions/moves, 2,205,836 variations based on 1,781,841 high quality human games
    GM++ Top Human Chess Book: 23,733,111 positions/moves, 1,004,919 variations based on 880,503 GM human games
    Tournament CTG Book with 24,599,456 positions/moves and 1,917,305 variations based on 4,936,363 top quality games

    Saturday, 1st August 2020

  • August 2020 Online Book Access update, over 100.3 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 52,059,184 positions/moves, 2,199,844 variations based on 1,778,348 high quality human games
    GM++ Top Human Chess Book: 23,636,571 positions/moves, 999,222 variations based on 877.239 GM human games
    Tournament CTG Book with 24,599,456 positions/moves and 1,917,305 variations based on 4,936,363 top quality games

    Tuesday, 21st July 2020

  • Mid July 2020 Online Book Access update, over 100 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 52,049,254 positions/moves, 2,199,419 variations based on 1,778,033 high quality human games
    GM++ Top Human Chess Book: 23,633,678 positions/moves, 999,105 variations based on 877.147 GM human games
    Tournament CTG Book with 24,599,456 positions/moves and 1,917,305 variations based on 4,936,363 top quality games

    Friday, 10th July 2020

  • July 2020 Tournament CTG Opening Book update, 24.6 million position for Book Subscribers available now
    • Plus online books:
    Human Reference Book 51,969,995 positions/moves, 2,195,431 variations based on 1,774,723 high quality human games
    GM++ Top Human Chess Book: 23,562,007 positions/moves, 995,493 variations based on 874,115 GM human games
    Tournament CTG Book with 24,599,456 positions/moves and 1,917,305 variations based on 4,936,363 top quality games

    Wednesday, 1st July 2020

  • July 2020 Online Book Access update, over 99.8 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 51,969,995 positions/moves, 2,195,431 variations based on 1,774,723 high quality human games
    GM++ Top Human Chess Book: 23,562,007 positions/moves, 995,493 variations based on 874,115 GM human games
    Tournament CTG Book with 24,267,425 positions/moves and 1,900,921 variations based on 4,920,878 top quality games

    Thursday, 25th June 2020

  • Updated iPhone HIARCS Chess version 13.83 released
  • Updated iPad HIARCS Chess version 13.8.3 released

    • Wednesday, 17th June 2020

  • Mid June 2020 Online Book Access update, over 99.8 million positions, with statistics - all analysed with play recommendations
    • Human Reference Book 51,962,701 positions/moves, 2,195,113 variations based on 1,774,495 high quality human games
    GM++ Top Human Chess Book: 23,556,341 positions/moves, 995,271 variations based on 873,943 GM human games
    Tournament CTG Book with 24,267,425 positions/moves and 1,900,921 variations based on 4,920,878 top quality games

    Monday, 1st June 2020

  • June 2020 Online Book Access update, over 99.7 million positions, with statistics - all analysed with play recommendations

    • Monday, 18th May 2020

  • Mid May 2020 Online Book Access update, over 99.5 million positions, with statistics - all analysed with play recommendations

    • Saturday, 2nd May 2020

  • May 2020 Online Book Access update, over 99.3 million positions, with statistics - all analysed with play recommendations

    • Wednesday, 20th April 2020

  • Mid April 2020 Online Book Access update, over 99.2 million positions, with statistics - all analysed with play recommendations

    • Wednesday, 8th April 2020

  • April 2020 Tournament CTG Opening Book update, now 24.2 million position for Book Subscribers available now

    • Thursday, 2nd April 2020

  • April 2020 Online Book Access update, over 99.1 million positions, with statistics - all analysed with play recommendations

    • Wednesday, 18th March 2020

  • Mid March 2020 Online Book Access update, over 99.1 million positions, with statistics - all analysed with play recommendations

    • Monday, 2nd March 2020

  • March 2020 Online Book Access update, over 97.4 million positions, with statistics - all analysed with play recommendations

    • Friday, 14th February 2020

  • Mid February 2020 Online Book Access update, over 97.3 million positions, with statistics - all analysed with play recommendations

    • Saturday, 1st February 2020

  • February 2020 Online Book Access update, over 97.2 million positions, with statistics - all analysed with play recommendations

    • Saturdayy, 25th January 2020

  • Late January 2020 Online Book Access update, over 97 million positions, with statistics - all analysed with play recommendations

    • Monday, 6th January 2020

  • January 2020 Tournament CTG Opening Book update, now 22.4 million position for Book Subscribers available now

    • Friday, 3rd January 2020

  • January 2020 Online Book Access update, over 96.3 million positions, with statistics - all analysed with play recommendations

    • Wednesday 1st January 2020

  • WISHING ALL OUR CUSTOMERS AND VISITORS A HAPPY NEW YEAR FOR 2020

    • Monday, 23rd December 2019

  • Christmas 2019 Online Book Access update, over 96.3 million positions, with statistics - all analysed with play recommendations

    • Wednesday, 18th December 2019

  • HIARCS Chess Explorer for Mac free update for customers
  • HIARCS Chess Explorer for PC free update for customers

    • Monday, 16th December 2019

  • Mac Chess Explorer users can read the latest online manual for HIARCS Chess Explorer for Mac here
  • PC Chess Explorer users can read the latest online manual for HIARCS Chess Explorer for PC here

    • Thursday, 12th December 2019

  • Mid December 2019 Online Human Reference and GM++ Opening Books - over 30,000 new positions with statistics and unique play recommendations

    • Wednesday, 4th December 2019

  • December 2019 Online Human Reference and GM++ Opening Books - over 75,000 new positions with statistics and unique play recommendations

    • Tuesday, 26th November 2019

  • Late November 2019 Online Human Reference and GM++ Opening Books - over 25,000 new positions with statistics and unique play recommendations

    • Monday, 18th November 2019

  • Mid November 2019 Online Human Reference and GM++ Opening Books - over 110,000 new positions with statistics and unique play recommendations

    • Monday, 4th November 2019

  • November 2019 Online Human Reference and GM++ Opening Books - 50,000 new positions with statistics and unique play recommendations

    • Tuesday, 15th October 2019

  • October 2019 Online Human Reference and GM++ Opening Books - 80,000 new positions with statistics and unique play recommendations

    • Friday, 4th October 2019

  • October 2019 Tournament CTG Opening Book update, now 22.4 million position for Book Subscribers available now

    • Thursday, 3rd October 2019

  • October 2019 online Tournament Opening Book now available in HIARCS Chess Explorer, now 22.4 million positions

    • Wednesday, 2nd October 2019

  • HIARCS Chess Explorer v1.9.4 free customer update for Apple Mac OS X now available
  • HIARCS Chess Explorer v1.9.4 free customer update for PC Windows now available

    • Tuesday, 1st October 2019

  • October 2019 Online Human Reference and GM++ Opening Books - 75,000 new positions with statistics and unique play recommendations, now 73.1 million

    • Monday, 16th September 2019

  • Mid September 2019 Online Human Reference and GM++ Opening Books - over 140,000 new positions with statistics and unique play recommendations

    • Sunday, 1st September 2019

  • September 2019 Online Human Reference and GM++ Opening Books - combined with tournament book over 95 million positions with statistics and unique play recommendations

    • Monday, 19th August 2019

  • Mid August 2019 Online Human Reference and GM++ Opening Books - combined with tournament book over 94.8 million positions with statistics and unique play recommendations

    • Monday, 29th July 2019

  • End July 2019 Online Human Reference and GM++ Opening Books - combined with tournament book over 94.5 million positions with statistics and unique play recommendations

    • Tuesday, 16th July 2019

  • Mid July 2019 Online Human Reference and GM++ Opening Books - combined with tournament book 94 million positions with statistics and unique play recommendations

    • Thursday, 4th July 2019

  • July 2019 Online Human Reference and GM++ Opening Books - combined over 72 million positions with statistics and unique play recommendations
  • July 2019 Tournament Opening Book update, now 22.1 million position for Book Subscribers available now

    • Monday, 17th June 2019

  • Mid June 2019 Online Human Reference and GM++ Opening Books - with latest openings

    • Saturday, 1st June 2019

  • June 2019 Online Human Reference and GM++ Opening Books - with latest openings

    • Wednesday, 15th May 2019

  • Mid May 2019 Online Human Reference and GM++ Opening Books - with latest openings

    • Wednesday, 1st May 2019

  • May 2019 Online Human Reference and GM++ Opening Books - with latest openings including from the Grenke Classic

    • Saturday, 20th April 2019

  • Mid April 2019 Online Human Reference and GM++ Opening Books - combined over 71 million positions with statistics and unique play recommendations

    • Friday, 5th April 2019

  • April 2019 Online Human Reference and GM++ Opening Books - combined over 71 million positions with statistics and unique play recommendations
  • April 2019 Tournament Opening Book update, now 21.9 million position for Book Subscribers available now

    • Monday, 25th March 2019

  • Late March 2019 Online Human Reference and GM++ Opening Books - combined over 71 million positions with statistics and unique play recommendations

    • Saturday, 2nd March 2019

  • March 2019 Online Human Reference and GM++ Opening Books - combined now over 71 million positions with statistics and unique play recommendations - now includes Aeroflot 2019

    • Friday, 1st February 2019

  • February 2019 Online Human Reference and GM++ Opening Books - combined now over 71 million positions with statistics and unique play recommendations - now includes Gibraltar 2019

    • Sunday, 27th January 2019

  • Tata Steel Tournament special 2019 Online Human Reference and GM++ Opening Books - combined now over 71 million positions with statistics and unique play recommendations

    • Friday, 4th January 2019

  • January 2019 Tournament Opening Book update, now 20.9 million position for Book Subscribers available now

    • Tuesday, 1st January 2019

  • January 2019 Online Human Reference and GM++ Opening Books - combined now over 71 million positions with statistics and unique play recommendations

    • Monday, 17th December 2018

  • Mid December 2018 Online Human Reference and GM++ Opening Books - combined now over 71 million positions with statistics and unique play recommendations

    • Monday, 3rd December 2018

  • December 2018 Online Human Reference and GM++ Opening Books - combined now over 71 million positions with statistics and unique play recommendations

    • Thursday, 22nd November 2018

  • HIARCS Chess Explorer v1.9.3 free customer update for Apple Mac OS X now available
  • HIARCS Chess Explorer v1.9.3 free customer update for PC Windows now available

    • Monday, 19th November 2018

  • Mid November 2018 Online Human Reference and GM++ Opening Books - combined now almost 71 million positions with statistics and unique play recommendations

    • Tuesday, 6th November 2018

  • November 2018 Online Human Reference and GM++ Opening Books - combined now almost 71 million positions with statistics and unique play recommendations

    • Tuesday, 23rd October 2018

  • Mid October 2018 Online Human Reference and GM++ Opening Books - combined now almost 71 million positions with statistics and unique play recommendations

    • Monday, 8th October 2018

  • October 2018 Online Human Reference and GM++ Opening Books - combined now almost 70 million positions with statistics and unique play recommendations
  • October 2018 Tournament Opening Book update, now 19.5 million position for Book Subscribers available now

    • Monday, 3rd September 2018

  • September 2018 Online Human Reference and GM++ Opening Books - combined now almost 70 million positions with statistics and unique play recommendations

    • Tuesday, 27th August 2018

  • Updated iPhone HIARCS Chess version 13.82 released
  • Updated iPad HIARCS Chess version 13.8.2 released

    • Monday, 20th August 2018

  • Updated iPhone HIARCS Chess version 13.81 released
  • Updated iPad HIARCS Chess version 13.8.1 released
  • Mid August 2018 Online Human Reference and GM++ Opening Books - combined now almost 70 million positions with statistics and unique play recommendations

    • Monday, 6th August 2018

  • August 2018 Online Human Reference and GM++ Opening Books - combined now almost 70 million positions with statistics and unique play recommendations

    • Monday, 23rd July 2018

  • Updated iPhone HIARCS Chess version 13.80 released
  • Updated iPad HIARCS Chess version 13.8.0 released

    • Tuesday, 3rd July 2018

  • July 2018 Tournament Opening Book update, now 19 million position for Book Subscribers available now
  • July 2018 Human Reference Book update, now 49 million position for Book Subscribers available now

    • Monday, 4th June 2018

  • HIARCS X winner of 53rd CSVN Programmers Tournament with 9/9!

    • Friday, 25th May 2018

  • Please read our updated Privacy Policy here

    • Sunday, 1st April 2018

  • April 2018 Tournament Opening Book for Book Subscribers now available
  • April 2018 Human Reference Book update for Book Subscribers now available

    • Thursday, 1st March 2018

  • HIARCS Chess Explorer v1.9.2 free customer update for Apple Mac OS X now available
  • HIARCS Chess Explorer v1.9.2 free customer update for PC Windows now available

    • Wednesday, 28th February 2018

  • March 2018 Human Reference Book update for Book Subscribers now available

    • Monday, 1st January 2018

  • January 2018 Tournament Opening Book for Book Subscribers now available

    • Sunday, 1st October 2017

  • Updated iPhone HIARCS Chess version 13.75 released

    • Thursday, 7th September 2017

  • Updated iPad HIARCS Chess version 13.7.9 released

    • Saturday, 1st July 2017

  • July 2017 Tournament Opening Book for Book Subscribers now available

    • Friday, 30th June 2017

  • July 2017 Online Tournament and Human Reference Opening Book for HIARCS Chess Explorer book subscribers now available

    • Tuesday, 6th June 2017

  • Updated iPhone HIARCS Chess version 13.74 released

    • Monday, 1st May 2017

  • May 2017 HIARCS wins 51st CSVN computer chess tournament

    • Monday, 24th April 2017

  • April 2017 Extra update to Human Reference and GM++ opening books for Book Subscribers now available

    • Thursday, 30th March 2017

  • April 2017 Tournament Opening Book for Book Subscribers now available
  • April 2017 Online Tournament and Human Reference Opening Book for HIARCS Chess Explorer book subscribers now available

    • Sunday, 5th February 2017

  • February 2017 Tournament Opening Book for Book Subscribers now available
  • February 2017 Online Tournament and Human Reference Opening Book for HIARCS Chess Explorer book subscribers now available

    • Saturday, 31st December 2016

  • December 2016 Tournament Opening Book for Book Subscribers now available
  • December 2016 Online Tournament and Human Reference Opening Book for HIARCS Chess Explorer book subscribers now available

    • Thursday, 20th October 2016

  • HIARCS Chess Explorer v1.9.1 free customer update for Apple Mac OS X now available
  • HIARCS Chess Explorer v1.9.1 free customer update for PC Windows now available

    • Friday, 30th September 2016

  • September 2016 Tournament Opening Book for Book Subscribers now available
  • September 2016 Online Tournament and Human Reference Opening Book for HIARCS Chess Explorer book subscribers now available

    • Thursday, 30th June 2016

  • June 2016 Tournament Opening Book for Book Subscribers now available
  • June 2016 Online Tournament and Human Reference Opening Book for HIARCS Chess Explorer book subscribers now available

    • Thursday, 31st March 2016

  • March 2016 Tournament Opening Book for Book Subscribers now available
  • March 2016 Online Tournament and Human Reference Opening Book for HIARCS Chess Explorer book subscribers now available

    • Thursday, 24th March 2016

  • HIARCS Chess Explorer v1.9 free customer update for Apple Mac OS X now available
  • HIARCS Chess Explorer v1.9 free customer update for PC Windows now available

    • Wednesday, 10th February 2016

  • Revelation II HIARCS 14 is strongest ever SSDF rated dedicated chess computer at 2929 Elo

    • Thursday, 31st December 2015

  • December 2015 Tournament Opening Book for Book Subscribers now available
  • December 2015 Online Tournament and Human Reference Opening Book for HIARCS Chess Explorer book subscribers now available

    • Wednesday, 30th September 2015

  • September 2015 Tournament Opening Book for Book Subscribers now available
  • September 2015 Online Tournament and Human Reference Opening Book for HIARCS Chess Explorer book subscribers now available

    • Tuesday, 30th June 2015

  • June 2015 Tournament Opening Book for Book Subscribers now available
  • June 2015 Online Tournament and Human Reference Opening Book for HIARCS Chess Explorer book subscribers now available

    • Tuesday, 31st March 2015

  • March 2015 Tournament Opening Book for Book Subscribers now available
  • March 2015 Online Tournament and Human Reference Opening Book for HIARCS Chess Explorer book subscribers now available

    • Wednesday, 31st December 2014

  • December 2014 Tournament Opening Book for Book Subscribers now available
  • December 2014 Online Tournament and Human Reference Opening Book for HIARCS Chess Explorer book subscribers now available

    • Tuesday, 18th December 2014

  • HIARCS Chess Explorer v1.8 free customer update for Apple Mac OS X now available
  • HIARCS Chess Explorer v1.8 free customer update for PC Windows now available

    • Saturday, 22nd November 2014

  • Updated iPad HIARCS Chess version 13.7.5 released

    • Sunday, 19th October 2014

  • Updated iPad HIARCS Chess version 13.70 released

    • Wednesday, 8th October 2014

  • Updated iPhone HIARCS Chess version 13.70 released

    • Monday, 30th September 2014

  • September 2014 Tournament Opening Book for Book Subscribers now available
  • September 2014 Online Tournament and Human Reference Opening Book for HIARCS Chess Explorer book subscribers now available

    • Monday, 30th June 2014

  • June 2014 Tournament Opening Book for Book Subscribers now available
  • June 2014 Online Tournament and Human Reference Opening Book for HIARCS Chess Explorer book subscribers now available

    • Friday, 16th May 2014

  • HIARCS Revelation is "the strongest dedicated chess computer we have ever tested" - SSDF Rating List

    • Monday, 12th May 2014

  • Update to Human Reference Opening Book for HIARCS Chess Explorer book subscribers

    • Tuesday, 22nd April 2014

  • Update to Human Reference Opening Book for HIARCS Chess Explorer book subscribers

    • Monday, 31st March 2014

  • March 2014 Tournament Opening Book for Book Subscribers now available

    • Friday, 28th March 2014

  • Update to Human Reference Opening Book for HIARCS Chess Explorer book subscribers with latest games

    • Friday, 14th March 2014

  • Update to Online GM+ and Human Reference Opening Book for HIARCS Chess Explorer book subscribers with latest games

    • Wednesday, 19th February 2014

  • Update to Online Human Reference Opening Book for HIARCS Chess Explorer book subscribers with latest games

    • Tuesday, 14th January 2014

  • HIARCS Chess Explorer v1.7 free customer update for Apple Mac OS X now available
  • HIARCS Chess Explorer v1.7 free customer update for PC Windows now available

    • Tuesday, 31st December 2013

  • December 2013 Online Tournament and Human Reference Opening Book for HIARCS Chess Explorer book subscribers now available

    • Sunday, 1st December 2013

  • Mac Deep Junior Yokohama World Computer Chess Champion version available (free for existing DJ13 customers!)

    • Monday, 11th November 2013

  • HIARCS Chess Explorer v1.6 free customer update for Apple Mac OS X now available
  • HIARCS Chess Explorer v1.6 free customer update for PC Windows now available

    • Thursday, 31st October 2013

  • PC Deep Junior Yokohama World Computer Chess Champion version available (free for DJ13 existing customers!)

    • Thursday, 24th October 2013

  • Deep Junior Yokohama World Computer Chess Champion version available (free for DJ13 existing customers!)

    • Monday, 30th September 2013

  • New September 2013 Tournament Opening Book Update for Book Subscribers now available
  • New September 2013 Online Tournament and Human Reference Opening Book Updates for HIARCS Chess Explorer subscribers now available

    • Wednesday, 11th September 2013

  • Updated iPhone HIARCS Chess version 13.6 released

    • Sunday, 18th August 2013

  • HIARCS wins the 2013 World Chess Software Championship

    • Saturday, 17th August 2013

  • Junior wins the 2013 World Computer Chess Championship

    • Thursday, 25th July 2013

  • HIARCS Chess Explorer v1.5 free customer update for Apple Mac OS X now available
  • HIARCS Chess Explorer v1.5 free customer update for PC Windows now available

    • Sunday, 30th June 2013

  • New June 2013 Opening Book Update for Book Subscribers now available

    • Sunday, 31st March 2013

  • New March 2013 Opening Book Update for Book Subscribers now available

    • Tuesday, 19th March 2013

  • HIARCS Chess Explorer v1.4 free customer update for Apple Mac OS X now available
  • HIARCS Chess Explorer v1.4 free customer update for PC Windows now available

    • Saturday, 9th March 2013

  • Updated iPad HIARCS Chess version 13.5 released

    • Tuesday, 5th March 2013

  • HIARCS Chess Explorer v1.3 free customer update for Apple Mac OS X now available
  • HIARCS Chess Explorer v1.3 free customer update for PC Windows now available

    • Friday, 1st March 2013

  • Updated iPhone HIARCS Chess version 13.5 released

    • Tuesday, 22nd January 2013

  • Updated iPad HIARCS Chess version 13.4 released

    • Monday, 21st January 2013

  • Updated iPhone HIARCS Chess version 13.4 released

    • Monday, 31st December 2012

  • New December 2012 Opening Book Update for Book Subscribers now available

    • Monday 24th December 2012

  • New Tournament and Human Reference Book available for HIARCS Chess Explorer book subscribers via Opening Explorer online book access

    • Saturday, 24th November 2012

  • HIARCS Chess Explorer v1.2 free customer update for Apple Mac OS X now available
  • HIARCS Chess Explorer v1.2 free customer update for PC Windows now available

    • Monday, 19th November 2012

  • The independent SSDF rating group report Deep HIARCS 14 defeated Deep Fritz 13 at tournament time controls by 28-12 (70% +149 Elo perf).Download Games

    • Wednesday, 31st October 2012

  • New Deep Junior 13.3 chess engine for Macintosh released

    • Friday, 12th October 2012

  • HIARCS Chess Explorer v1.1 free customer update for Apple Mac OS X now available
  • HIARCS Chess Explorer v1.1 free customer update for PC Windows now available

    • Sunday, 30th September 2012

  • New September 2012 Opening Book Update for Book Subscribers now available

    • Sunday, 26th August 2012

  • The wait is over! - HIARCS Chess Explorer and HIARCS 14 available now for Apple Mac OS
  • The wait is over! - HIARCS Chess Explorer and HIARCS 14 available now for PC Windows

    • Saturday, 30th June 2012

  • New June 2012 Opening Book Update for Book Subscribers now available
  • Deep Junior 13.3 update available (free for existing customers)

    • Monday, 25th June 2012

  • HIARCS Chess Explorer release candidate in testing

    • Tuesday, 15th May 2012

  • The innovative new HIARCS Chess Explorer product has moved forward to the final beta stage

    • Wednesday, 28th March 2012

  • New March 2012 Opening Book Update for Book Subscribers now available

    • Tuesday, 28th February 2012

  • The innovative new HIARCS Chess Explorer product has moved forward to the next beta stage

    • Wednesday, 1st February 2012

  • Current World Computer Chess Champion Deep Junior 13 released!

    • Saturday, 31st December 2011

  • New December 2011 Opening Book Update for Book Subscribers now available

    • Saturday, 26th November 2011

  • HIARCS wins the World Chess Software Championship

    • Wednesday, 23rd November 2011

  • Junior wins the World Computer Chess Championship

    • Thursday, 29th September 2011

  • New September 2011 Opening Book Update for Book Subscribers now available

    • Tuesday, 13th September 2011

  • HIARCS iPad 13.3 now available from the AppStore

    • Saturday, 10th September 2011

  • HIARCS iPhone 13.31 reviewed by iPhone App Finder, rated 9.4/10!

    • Saturday, 3rd September 2011

  • HIARCS iPhone 13.3 now available from the AppStore

    • Monday, 29th August 2011

  • HIARCS iPad Chess finishes detailed beta testing, product pages updated

    • Saturday, 3rd September 2011

  • HIARCS iPhone 13.3 now available from the AppStore

    • Monday, 29th August 2011

  • HIARCS iPad Chess finishes detailed beta testing, product pages updated

    • Sunday, 28th August 2011

  • HIARCS iPhone Chess finishes detailed beta testing, product pages updated

    • Thursday, 28th July 2011

  • HIARCS iPad Chess goes code complete: release to follow after final beta testing

    • Thursday, 14th July 2011

  • HIARCS Chess Explorer development announced to customers

    • Tuesday, 28th June 2011

  • New June 2011 Opening Book update for Book Subscribers now available

    • Monday, 27th June 2011

  • New Deep Junior 12.5 chess engine for Macintosh released

    • Saturday, 21st May 2011

  • Reference book with statistics from top class human games now available - free for HIARCS book subscribers

    • Monday, 16th May 2011

  • PC Deep Junior 12.5 UCI - shared first at Thüringer Computer Chess Championship, Germany, May 2011

    • Wednesday, 6th April 2011

  • New Deep Junior 12.5 UCI chess engine available now! (free for existing Junior customers)

    • Thursday, 31st March 2011

  • New March 2011 Opening Book update for Book Subscribers now available

    • Monday, 28th February 2011

  • Deep Junior 12 and HIARCS 13.2 with Sigma Chess 6.2.1 now available

    • Friday, 11th February 2011

  • HIARCS Chess 12.3 for iPhone now available (free update for existing iPhone customers)

    • Friday, 24th December 2010

  • PC Chess HIARCS 13.2 UCI Update (free for all existing PC HIARCS 13 UCI customers)

    • Thursday, 23rd December 2010

  • New December 2010 Opening Book update for Book Subscribers now available

    • Thursday, 28th October 2010

  • New Deep Junior 12 UCI chess engine available now!

    • Friday, 10th September 2010

  • New September 2010 Opening Book update for Book Subscribers now available

    • Thursday, 2nd September 2010

  • Much anticipated HIARCS Palm Chess Pro 13.1 released.

    • Tuesday, 22nd June 2010

  • New June 2010 Opening Book Update for Book Subscribers now available

    • Monday, 31st May 2010

  • New HIARCS 13.1 for Pocket PC now available

    • Saturday, 22nd May 2010

  • New HIARCS Chess Opening Book Subscription now available

    • Friday, 21st May 2010

  • New PC Chess HIARCS 13 UCI Single and Multi-core/processor products released!

    • Monday, 17th May 2010

  • New Deep Junior 11.2 UCI chess engine available now!

    • Tuesday, 19th April 2010

  • New Sigma Chess 6.2 HIARCS 13 for Apple Macintosh Computers available now!

    • Sunday, 14th March 2010

  • New Deep Junior 11.1a UCI chess engine available now!

    • Wednesday, 10th March 2010

  • New Deep Junior 11.1 UCI chess engine available now!

    • Monday, 8th March 2010

  • New Deep Junior 11.1 UCI chess engine available soon

    • Wednesday, 11th November 2009

  • Free update for HIARCS Palm Chess Pro owners to version 12.1u

    • Monday, 28th September 2009

  • Download free HIARCS 12.1 Chessbase opening book in ctg format 23Mb - Chessbase GUI on PC needed to read book

    • Tuesday, 22nd September 2009

  • HIARCS 12.1 for Pocket PC chess achieves highest ever rating for a mobile device of 2749 Elo on official SSDF rating list

    • Saturday, 19th September 2009

  • The 1992 HIARCS 1.0+ for PC Windows/Dos is available for free download on our free chess software page.

    • Friday, 28th August 2009

  • HIARCS Chess for the iPhone and iPod Touch finally available on the Apple App Store.

    • Saturday, 15th August 2009

  • HIARCS on Pocket PC wins 2009 Mescusor Cup in Buenos Aires, Argentina ahead of Grandmasters, while scoring an incredible undefeated 9½/10 points and 2938 Elo performance rating!

    • Monday, 7th June 2009

  • HIARCS wins the 9th International CSVN Tournament in Leiden, The Netherlands, June 2009

    • Sunday, 8th March 2009

  • Much anticipated HIARCS Palm Chess Pro finally released

    • Wednesday, 3rd December 2008

  • The new Pocket Chess HIARCS for CEBoard product released. Now Pocket PC chess users can have the strongest chess program native on their Pocket PC.

    • Monday, 17th November 2008

  • HIARCS was runner-up in the 28th Dutch Open Computer Chess Championship. HIARCS was running on a single computer and it's only defeat was to a 40 core, 5 computer cluster "super computer".

    • Monday, 1st August 2008

  • HIARCS 12.1 is the new engine for Pocket Fritz 3

    • Sunday, 15th June 2008

  • Sigma Chess 6.1.6 HIARCS 12.1 now available

    • Monday 5th May 2008

  • HIARCS wins 17th International German Computer Chess Championship ahead of a World class field

    • Wednesday, 2nd April 2008

  • HIARCS 12 UCI SP and MP now available

    • Monday, 31st December 2007

  • HIARCS wins 17th International Paderborn Computer Chess Championship!

    • Friday, 16th November 2007

  • Palm Chess HIARCS 9.7 now available

    • Monday, 13th August 2007

  • Sigma Chess 6.1.5 HIARCS 11.2 is now available

    • Tuesday, 31st July 2007

  • New HIARCS Forums launched for discussions of HIARCS computer chess, chess and wider subjects with regular competitions and special discounts for registered members

    • Thursday, 26th July 2007

  • Free update to HIARCS 11.2 now available

    • Friday, 8th June 2007

  • Free setup installers now available for the original HIARCS versions from 1981 and 1983.

    • Friday, 11th May 2007

  • We have a winner of the resurrect HIARCS challenge!

    • Tuesday, 10th April 2007

  • Sigma Chess 6.1.4 HIARCS 11 is now available

    • Monday, 2nd April 2007

  • Sigma Chess HIARCS 11 is now available for existing owners

    • Wednesday, 21st February 2007

  • HIARCS 11.1 UCI version which became ICC Computer Chess Blitz Champion 2007 is available as a free update for HIARCS 11 customers

    • Tuesday, 20th February 2007

  • HIARCS 11 UCI is Internet Chess Club Computer Chess Blitz Champion 2007

    • Monday, 6th November 2006

  • The first prototype Deep HIARCS MP version wins trophy for 3rd place in Dutch Open Championship in Leiden, The Netherlands. Impressively coming above well known programs like Deep Shredder 10, Fruit X, Deep Gandalf, Deep Sjeng and The King. Despite some hardware problems this was a good first outing for Deep Hiarcs MP considering the software only ran in multiprocessor form a week ago!

    • Monday, 30th October 2006

  • The first ever Deep HIARCS multiprocessor version now running on our development machines just in time for the Dutch Open in Leiden!

    • Thursday, 28th September 2006

  • HIARCS UCI X54 32 and 64 bit free updates for HIARCS UCI owners now available

    • Tuesday, 30th May 2006

  • HIARCS UCI now available to buy online

    • Thursday, 6th April 2006

  • HIARCS for Palm wins a GM master tournament in the Philippines

    • Friday, 17th March 2006

  • Some outstanding games played by HIARCS for Palm in the independent SSDF testing can be seen and played through online. HIARCS for Palm is the world's top rated Palm chess program.

    • Monday, 27th February 2006

  • Some outstanding games played by PC HIARCS 10 in the independent SSDF testing can be seen and played through online. HIARCS 10 is the world's top rated chess program on the Selective Search rating list.

    • Thursday, December 29th 2005

  • Sigma Chess 6.1.3 HIARCS 10 released. Sigma chess now supports engine-engine matches!

    • Monday, December 12th 2005

  • Palm HIARCS 9.6 is now available!
  • Mac HIARCS 10 now available for free to registered customers!

    • Tuesday, 25th January 2005

  • Palm HIARCS' wins against GM Jan Gustafsson.

    • Sunday, 23rd January 2005

  • Sigma Chess HIARCS 9.60 for Macintosh now available. Includes new Sigma Chess 6.1.1 GUI and HIARCS 9.60 UCI chess engine.

    • Wednesday, 15th December 2004

  • Palm HIARCS 9.5a Christmas update available

    • Sunday, 12th December 2004

  • Palm HIARCS 9.5 competes in the CSS Online Masters 2005 against some of the fastest PCs!

    • Monday, 6th December 2004

  • Palm HIARCS 9.5 version now released offering intermediate levels and other coaching enhancements.

    • Friday, 30th July 2004

  • HIARCS 9.46 Palm Chess Software now available

    • Saturday, 17th July 2004

  • Based on customer results Palm Chess HIARCS on Tungsten T3 breaks through the 2600 Elo barrier.

    • Monday, 5th July 2004

  • HIARCS 9.41 Palm Chess Software now available

    • Friday, 25th June 2004

  • HIARCS 9.32 for Palm now available

    • Tuesday, 22nd June 2004

  • HIARCS 9.31 for Palm now available