HIARCS Chess Software for PC Windows, Apple Mac and iPhone/iPad PC Chess HIARCS 11
World Championship winning computer chess software program & downloads for chess database, analysis and play on PC, Mac and iPhone

HIARCS Home Palm Chess HIARCS Pocket Chess HIARCS Palm Chess HIARCS9 PC Chess HIARCS 10 Mac Chess HIARCS 10 PC Chess HIARCS 11 Mac Chess HIARCS 11 Mac Chess HIARCS 12 PC Chess HIARCS 12 Pocket HIARCS 12 HIARCS Palm Pro 12 PC Deep Junior 11 Mac Chess HIARCS 13 iPhone HIARCS 12 PC Chess HIARCS 13 PC Deep Junior 12 Mac HIARCS & Junior

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H11  How To Buy
H11 UCI Engine Options
H11 PC Download
HIARCS 11 Games

Single and Multiprocessor versions available NOW!
A chess program that can do more than calculate!

Hiarcs has long been established as one of the world's premier chess playing engines. Now the latest version 11.2 takes the HIARCS series of chess engines to a new level of chess understanding and chess strength. Never before has HIARCS been so fast, searched so deep or been so strong!  The unique and entertaining attacking style has been enhanced and extended so HIARCS is often more decisive in its attacking approach which includes direct king attacks. The chess knowledge has naturally been improved and the search is deeper and hence Hiarcs 11 is more capable than any of its predecessors.

As usual all the unique chess features of HIARCS remain including the human-like but aggressive playing style, a liking for king attacks and unbalanced positions, and a preference for initiative and attacking options over more materialistic concerns associated with traditional chess programs. The ability to learn from positions it has seen remains essential for all chess players who analyse chess games, studies, positions and openings as it enables HIARCS to understand deep strategic or tactical ideas while analysing with you. With HIARCS you get an intelligent chess partner which actually learns and improves with you!

For the first time ever HIARCS now has the capability to search in parallel simultaneously on multiple CPUs or Cores, this qualifies for the so called "Deep" prefix for the name, e.g. Deep HIARCS 11, but we prefer to simply call it "HIARCS 11 MP" (for Multiprocessing).

The latest HIARCS opening book is included which has been significantly enhanced with the latest GM theory and a wealth of novelties to provide a huge repertoire of finely tuned variations. This is the work of computer chess expert Eric Hallsworth and HIARCS author Mark Uniacke who have combined to provide an exceptional new opening book. 

These features all add up to make HIARCS an essential tool for chess players of all strengths making the chess games you play or analyse much more interesting, unpredictable and exciting than ever before.

HIARCS 11 UCI provides the following key features:

bulletThe premier HIARCS 11.2 single or multiprocessor edition chess engine in UCI form for use in all good chess GUIs
bulletStrongest ever HIARCS chess engine, significantly stronger than HIARCS 10
bulletFREE updates of the HIARCS 11 series and special upgrade pricing to HIARCS 12 UCI when purchased on www.hiarcs.com
bulletHIARCS 11.2 now available as free update for customers.
bulletLatest HIARCS tournament opening book and accessible directly from the engine
bulletEngine book learning and position learning capabilities are built into all HIARCS UCI engines helping HIARCS improve through its playing experience
bulletFull set of configurable HIARCS engine parameters
bulletUCI compatibility including FRC/Chess960 allowing integration into any GUI supporting UCI
bulletUser defined playing strength from 1250 Elo based on your chosen Elo with realistic human like play make HIARCS suitable for all players from beginners to the World Champion.

HIARCS 11.2 UCI is a chess engine and is available by software download only. HIARCS UCI requires a PC running MS Windows 95, 98, ME, NT4, 2000, XP or Vista with a UCI compatible GUI (a Graphical User Interface is not included in the package). We recommend the excellent free Arena GUI v1.1 which supports UCI chess engines like HIARCS UCI. Alternatively other quality GUIs supporting UCI chess engines can be separately purchased e.g. Arena, Fritz, Chessbase, Chess Assistant, Shredder, Chess Partner etc

Our latest and strongest version is now available in both single and/or multiprocessor versions and we offer special upgrade prices for existing HIARCS UCI customers. To find out more and how to buy please visit our How to Buy HIARCS 11 UCI page.


Special thanks to Harvey Williamson, Enrico Carrisco and Eric Hallsworth for their outstanding testing and suggestions throughout the development of HIARCS 11 and without whom this product would not be what it is today.

Thanks also to a number of supporters who prefer to remain incognito.

We thank Eugene Nalimov and Andrew Kadatch for their kind permission to use their access code (copyright (c) Eugene Nalimov) and decompression code (copyright (c) Andrew Kadatch) for Nalimov tablebases in the HIARCS chess engine.


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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.   *VAT may be applicable for customers resident in the European Union.
Prices are given in Pounds Sterling, US dollars and Euros. Prices are subject to change without notice.
Purchases in other currencies will be subject to conversion rates from Pounds Sterling (GBP).

World class Palm, PC Chess, Mac Chess, Pocket PC and iPad, iPhone Computer Chess Software with innovative features and chess playing strength
HIARCS Computer Chess Engines are designed and developed by Mark Uniacke in England.
HIARCS is a trademark of Applied Computer Concepts Ltd. All other product trademarks acknowledged.
Copyright 1991-2016 Applied Computer Concepts Ltd. All rights reserved. Last modified: Monday February 01, 2016.
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