HIARCS Chess Software for PC Windows, Apple Mac and iPhone/iPad Tournament Book
World Championship winning computer chess software program & downloads for chess database, analysis & play on PC, Mac and iPhone


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HIARCS Chess Opening Book Subscription

World's Strongest and broadest chess opening books¹
Suitable for all players from beginners to the World Chess Champion
Platform: PC Windows, Mac OS X, iPhone/iPad
Chessbase GUI for CTG access or HIARCS Chess for iPad/iPhone (HBG) or HIARCS Chess Explorer (online access)
Latest update: August 2021 includes latest human theory analysed with unique play recommendations
Tournament CTG book with 28,323,677
positions/moves and 1,755,342 variations based on 1,727,883 top quality games
one year online access via HIARCS Chess Explorer to our unrivalled Tournament, Human Reference and GM++ opening books totalling over 106 million positions!
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

[New!]Opening Book Sale extended, don't miss out

"I subscribe to your Powerbook now and I'm pretty impressed by it, I use it all the time in my chess teaching. As far as I know it is the best publicly available book."
Larry Kaufman, Grandmaster and World Senior Chess Champion.

Click here to order the 1 Year HIARCS Chess Opening Book Subscription
Price*: £49.95 / €55.95 / $62.45   SAVE 20% NOW  £39.96 / 44.76 / $49.96

HIARCS Chess Opening Books are for software download only. They require either the HIARCS Chess Explorer GUI (direct access), a Chessbase/Fritz GUI for CTG, HIARCS chess engine for HCS or HIARCS Chess on iPhone/iPad for HBG. Statistics are only available for direct access, CTG & HBG format books. The HCS format book can be used by HIARCS 14 engines on Mac and PC.

Please note the HIARCS opening books are for your personal use only. Under no circumstances are the books to used for commercial purposes, hosted on another website or used in official tournaments without the prior express written permission of Applied Computer Concepts Ltd. All HIARCS books are copyright © 1991-2021 Applied Computer Concepts Ltd. All rights reserved.


Each HIARCS product comes with its own chess opening book with the latest chess opening theory at the time of the release of the particular product. However, many chess players need to remain up to date with the latest chess opening theory throughout the year and online chess engine players like to have the latest and strongest chess opening book.

For many years HIARCS has had the strongest opening book available and it keeps getting stronger with every release. We even supplied the HIARCS tournament chess opening book to help World Chess Champion, Vishy Anand's team prepare for his World Championship matches.

We now find our book is sought after by many of world's strongest players and is an essential additional resource for the serious chess player.

The latest HIARCS tournament opening book is available in Chessbase CTG format (for PC), HIARCS' own HCS format for Mac and PC with regular updates for subscribers to the HIARCS Chess Opening Book Subscription product. Improvements per year have averaged about 80 Elo points. Over the course of a year the opening book may contribute more to chess strength improvement than the increase in chess engine strength.

The HIARCS Chess Opening Book Subscription offers the following:

bulletLatest HIARCS tournament chess opening book in CTG, HBG and HCS formats with online access for HIARCS Chess Explorer customers.
bulletQuarterly updates usually in July, October, January and April - you will be sent an email with details of each update.
bulletDirect access to human reference if you already have HIARCS Chess Explorer
bulletUp to date with the latest chess opening theory
bulletAverage improvement of 80 Elo per year
bulletUpon purchase you will receive a link and login details for downloading the latest HIARCS opening book and many previous opening books!
bulletSubscription lasts 1 year and is renewable
bulletEmailed delivery and discounted renewal

The HIARCS tournament book is unbeaten in all book matches against other commercial books. It is the standard by which any other chess opening book should be measured.

Click here to order the 1 Year HIARCS Chess Opening Book Subscription
Price*: £49.95 / €54.95 / $59.95   SAVE 20% NOW  £39.96 / 43.96 / $47.96

Unrivalled track record of delivery and improvements:

Book release date and name Positions Variations Statistics from Top Quality Games
May 2010: Hiarcs13aBook 2,414,780 325,712 545,826
June 2010: Hiarcs13bBook 2,479,533 335,923 583,896
September 2010: Hiarcs13cBook 2,581,613 351,951 719,857
December 2010: Hiarcs13dBook 2,925,726 382,899 678,641
March 2011: Hiarcs13eBook 3,454,030 442,650 1,077,116
June 2011: Hiarcs13fBook 3,879,189 527,673 1,363,537
September 2011: Hiarcs13gBook 4,163,027 497,190 1,602,737
December 2011: Hiarcs13hBook 5,185,413 633,515 2,083,695
March 2012: Hiarcs13iBook 5,302,731 647,305 1,770,327
June 2012: Hiarcs13jBook 6,304,018 688,358 1,871,251
September 2012: Hiarcs14cBook 7,359,979 788,566 1,982,128
December 2012: Hiarcs14dBook 7,558,429 811,574 2,090,700
March 2013: Hiarcs14eBook 8,247,074 833,897 2,038,316
June 2013: Hiarcs14fBook 8,604,093 858,231 1,793,542
September 2013: Hiarcs14gBook 9,756,350 972,482 1,889,958
December 2013: Hiarcs14hBook 10,211,291 1,015,501 2,015,268
March 2014: Hiarcs14iBook 10,897,668 1,068,174 1,803,109
June 2014:  Hiarcs14jBook 11,161,032 1,092,176 1,930,879
September 2014:  Hiarcs14kBook 12,024,410 1,157,157 2,100,345
December 2014:  Hiarcs14lBook 12,681,453 1,202,363 2,189,453
March 2015:  Hiarcs14mBook 12,930,890 1,222,011 2,262,009
June 2015:  Hiarcs14nBook 13,047,908 1,230,973 2,284,528
September 2015:  Hiarcs14oBook 14,254,799 834,277 1,071,330
December 2015:  Hiarcs14pBook 16,933,739 973,051 1,254,482
March 2016:  Hiarcs14qBook 17,285,794 1,200,871 2,511,474
June 2016:  Hiarcs14rBook 17,663,676 1,153,239 2,754,556
September 2016:  Hiarcs14sBook 18,156,517 1,511,490 4,362,240
December 2016:  Hiarcs14tBook 19,788,161 1,632,989 4,573,427
February 2017:  Hiarcs14uBook 19,788,161 1,632,989 4,573,427
April 2017:  Hiarcs14vBook 19,598,165 1,597,806 4,438,337
July 2017:  Hiarcs14wBook 20,116,561 1,742,212 5,137,292
October 2017:  Hiarcs14xBook 17,721,580 1,473,019 4,713,302
January 2018:  Hiarcs14yBook 16,524,864 1.329.892 3,995,015
April 2018:  Hiarcs14zBook 16,877,162 1.567,454 3,885,104
July 2018:  Hiarcs14zaBook 19,067,269 1,457,537 4,132,399
October 2018:  Hiarcs14zbBook 19,195,301 1,533,133 4,105,104
January 2019:  Hiarcs14zcBook 20,944,106 1,711,469 4,553,033
April 2019:  Hiarcs14zdBook 21,929,403 1,767,391 4,788,010
July 2019:  Hiarcs14zeBook 22,166,732 1,779,117 4,800,073
October 2019:  Hiarcs14zfBook 22,462,112 1,793,343 4,814,684
January 2020  Hiarcs14zgBook 22,729,989 1,807,576  4,831,080
April 2020  Hiarcs14zhBook 24,273,151 1,901,315 4,921,239
July 2020 
24,599,456 1,917,305 4,936,363
October 2020  Hiarcs14zjBook 25,412,066 1,950,470 4,943,505
January 2021  Hiarcs14zkBook 26,631,111 1,910,946 4,962,159

"I subscribe to your Powerbook now and I'm pretty impressed by it, I use it all the time in my chess teaching. As far as I know it is the best publicly available book."
Larry Kaufman, Grandmaster and World Senior Chess Champion.

"I have tried the book in several configurations. Means in autoplayer, games at home, at FICS chess server and at playchess. I am very impressed. My feedback: This book is a masterpiece ! Congratulations" - Clemens

"I agree. Clearly a lot of work has been put into this book to provide strength in depth so the openings hold up in different time control games.
Excellent value for money in its own right but with a quarterly update ... just superb."
- PeterG

¹ Computer chess opening books contain positions, moves, statistics and play recommendations, they do not include games and textual comments.


The HIARCS opening books are prepared and managed by Mark Uniacke.

Assistance is provided by Senior International Master Harvey Williamson and Computer Chess Expert Eric Hallsworth. Further input is provided by a number of top chess players and subscribers to the book. Thank you - your help enables a larger, stronger and better opening books.


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"generally I use HIARCS." - Five time World Chess Champion Vishy Anand, in a recent interview when asked what chess program he uses to analyse with
"HIARCS is much better positionally than Deep Blue." - Garry Kasparov 1997 (after game 5 of the rematch)

World Chess Champion, Vishy Anand, used "Powerful" HIARCS machine in preparations for his 2010 & 2012 world title matches

"This level of service is one other big reason to buy HIARCS." - John Jackson

† Highest performance reached depends on computer used. Computer Chess Software with world class chess engine playing strength.
HIARCS is designed and developed by Mark Uniacke in England.

*VAT and local sales tax may be applicable. Prices given in GBP, USD and EUR are subject to change without notice.
Other currencies are subject to conversion rates from GBP.

HIARCS is a trademark of Applied Computer Concepts Ltd. All other product trademarks acknowledged.
Copyright © 1991-2021 Applied Computer Concepts Ltd. All rights reserved.
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