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

HIARCS Home Online Book Access Book Download Sub Free Opening Books

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Online Tournament & Reference Book Access: 1 year subscription
World's Strongest Chess Opening Books
Suitable for all players from beginners to the World Chess Champion
Massive references of over 94 million positions, moves and statistics
Platform: HIARCS Chess Explorer for PC Windows or Apple Mac required to access books
Latest update: July 2019
Human Reference book 49,862,457 positions/moves, 2,097,947 variations based on 1,699,557 high quality human games
GM++ top human chess book: 22,418,101 positions/moves, 940,566 variations based on 829,772 GM human games
Tournament book with 22,166,732 positions/moves and 1,779,117 variations based on 4,800,073 top quality games

"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.

HIARCS Chess Explorer provides online access to GM opening books as standard. If you want to enhance this to have access to the World Strongest Chess Opening Book and a Human Reference of opening play this is the product for you. Many chess players need to remain up to date with the latest chess opening theory throughout the year and that is where our online book access subscription can help, giving you the latest and strongest opening book straight into the Opening Explorer view of your HIARCS Chess Explorer application.

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

For the first time we are making our tournament opening book available for online access from HIARCS Chess Explorer. You get:

bulletOnline access to the HIARCS Tournament opening book with quarterly updates in October, January, April and July of each year
bulletIncludes tournament and human reference books
bulletMoves analysed with statistics and up to date with latest chess opening theory
bulletUpon purchase you will receive a personal book license code which can be used in PC and Mac HIARCS Chess Explorer to enable direct access to the books in the Opening Explorer views
bulletSubscription lasts 1 year and is renewable
bulletEmail delivery, discounted renewals

Click here to order the 1 Year Online Tournament Book Access Subscription
Price*: 31.24 / 36.40 / $39.95      SAVE 20% NOW  24.99 / 29.12 / $31.96    *VAT may be applicable for European Union residents.


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

If you want to download the HIARCS tournament opening book in Chessbase CTG or HIarcs HCS format you need the HIARCS Chess Opening Book Subscription instead.

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 1991-2019 Applied Computer Concepts Ltd. All rights reserved.


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.  
*VAT may be applicable for customers resident in the European Union. Local sales tax may apply.
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 1991-2019 Applied Computer Concepts Ltd. All rights reserved. Last modified: Wednesday April 10, 2019.
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