HIARCS Chess Software for PC Windows, Apple Mac and iPhone/iPad PC Chess HIARCS 13
World Championship winning computer chess software program & downloads for chess database, analysis & play on PC, Mac and iPhone

HIARCS Home Up How To Buy UCI Engine Options PC UCI FAQ PC Download

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Single and Multi-core/processor versions available NOW
A chess program that can do more than calculate!

For 20 years HIARCS has been among the very best chess programs in the world. Ever since its first World Championship success in 1991 HIARCS has maintained its position as one of the world's premier chess playing programs. As recently as June 2009 HIARCS further enhanced its reputation by winning the 9th International CSVN Tournament in Leiden, The Netherlands.

HIARCS is famous for its human-like playing style and its ability to come up with the unexpected. Recent HIARCS versions are renowned for sharp attacking chess and a never say die attitude to their play. In HIARCS 13 this playing style has been positively enhanced through a new deeper search and evaluation of dynamic possibilities. It is capable of building deep attacking positions against the enemy king and executing exciting mating attacks. This new approach enables HIARCS to play interesting, distinctive aggressive chess while being sensitive to the needs of the position. This has improved HIARCS in all phases of the game and even in quieter positions HIARCS 13 is able to be more selective about the variations it explores to achieve a better understanding than previous versions leading to much stronger play.

As an analysis partner HIARCS is second to none with its ability to learn from the positions it analyses and plays. This is an essential feature for all chess players interested in analysing games, studies, positions and particularly the opening as it guides HIARCS into a greater understanding of chess positions and their possibilities than ever before. For many years top chess players have used HIARCS as an important analysis partner for this very reason.

This combination of strength, playing style and learning makes HIARCS 13 ideal for all players looking for an intelligent chess partner that learns and improves with you. A new super strong HIARCS 13 openings book (in own/engine HCS format) is also included which has been dramatically enhanced with the latest cutting edge chess theory and a wealth of novelties to provide a huge repertoire of finely tuned variations.

The HIARCS 13 MP version is the ultimate multi-core/multi-processor HIARCS chess engine capable of utilising up to 16 CPU cores simultaneously. This results in much faster analysis and playing strength depending on your hardware e.g. on Dual-Core hardware HIARCS 13 MP runs nearly twice as fast as on a single core processor. HIARCS 13 MP even works on single core processor systems so you can use it today in the knowledge it can grow with your new hardware to future proof your purchase decision.

HIARCS 13 UCI provides the following key features:

bulletThe premier HIARCS 13.2 & 13.1 single or multi-core/mulit-processor edition chess engines in UCI form for use in all good chess GUIs
bulletBoth HIARCS 13.2 and HIARCS 13.1 are 32 bit engines compatible with BOTH 32 and 64 bit Windows operating systems
bulletStrongest ever HIARCS chess engine, significantly stronger than HIARCS 12 by more than 100 Elo
bulletFREE updates of the HIARCS 13 series as and when available and special upgrade pricing to an eventual HIARCS 14 UCI when purchased on www.hiarcs.com.
bulletLatest super strong HIARCS tournament opening book 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
bulletFlexible user-friendly license
bulletUCI compatibility including FRC/Chess960 allowing integration into any GUI supporting UCI
bulletUser defined playing strength from 750 Elo based on your chosen Elo with realistic human like play make HIARCS suitable for all players from beginners to the World Champion.
bulletPurchase includes discount coupon of 20% off future purchases on www.hiarcs.com (valid until 31st December 2011)

HIARCS 13 UCI is a chess engine and is available by software download only. HIARCS 13 UCI requires a PC running MS Windows 98, ME, NT4, 2000, XP, Vista or Windows 7 (all versions 32 & 64 bit) with a UCI compatible GUI (a Graphical User Interface is not included in the package). We recommend the excellent free Arena GUI which supports UCI chess engines like HIARCS UCI. Alternatively other quality GUIs supporting UCI chess engines can be separately purchased e.g. Fritz, Chessbase, Chess Assistant, Shredder, Aquarium, Chess Partner etc

Our latest and strongest version is now available in both single and/or multi-core/multi-processor 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 13 page.


I would like to dedicate HIARCS 13 to my Nan, Lily Uniacke, who sadly died very recently. A strong, genuine independent lady who was as reliable as you could find, a true woman of substance. Her love touched and enriched my life even in her last years.


Special thanks to Harvey Williamson, Eric Hallsworth, Rob Osborne, Enrico Carrisco, Christian Goralski and André van Ark for their outstanding testing and suggestions throughout the development of HIARCS 13 and without whom this product would not be what it is today.

A big thanks to  Eric Hallsworth, Harvey Williamson, Rob Osbourne and Christian Goralski for their help with the opening book and operating HIARCS at various tournaments.

Thanks also to a number of other 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. 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.
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