It contains millions of unique positions, but prioritizes depth and analytical correctness over sheer volume.
For the first time, many distributors are offering a that includes the proprietary CTG format alongside the standard book. Here is why this matters for your preparation.
When used with HIARCS Chess Explorer, it can help set realistic opening challenges for human players at various skill levels. HIARCS Chess Software for Mac and PC chess hiarcs 15q openings book includes ctg and repack
Note: It is always recommended to obtain the latest HIARCS Tournament Chess Opening Book directly from the source to ensure the highest quality and safety, as authorized by HIARCS. How to Use the HIARCS 15q Openings Book
Native format for the HIARCS Chess Explorer Pro and original HIARCS engines. It contains millions of unique positions, but prioritizes
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While HIARCS has its own internal format (HBK), the inclusion of CTG files ensures it can be used in the ChessBase environment or with other GUI programs like Fritz. When used with HIARCS Chess Explorer, it can
Designed for use on iOS devices (iPhone and iPad), allowing mobile users to carry professional-grade opening theory in their pocket. The "Repack" and Subscription Model
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They are the strongest available opening books and are at least 100 Elo stronger than the free chess opening books hosted here. HIARCS Chess Software Chess Openings: Book Access and CTG Downloads
Unlike pure engine books, the 15q release balances top-tier computer theory with human playability, making it suitable for both opening training and high-level competition.
