To truly appreciate its power, one must first acknowledge HIARCS itself—a six-time World Chess Software Champion and the engine of choice for chess legends like Viswanathan Anand and Garry Kasparov. Decades of elite computer chess pedigree feed directly into the quality of its opening books.
The is currently the gold standard for club players (1800-2200 Elo) and correspondence players. It bridges the gap between raw engine calculation and practical, winning chess.
We tested the (CTG repack) against four popular opening books: Perfect 2024 , Donninger , and Sedat’s Opening Book . The conditions: 10-minute rapid, using the Hiarcs 15q engine on a 16-core Threadripper. chess hiarcs 15q openings book includes ctg and repack
Download the CTG files and add them to your ChessBase software's "Opening Tree" option.
Before understanding the opening book, we must respect the engine behind it. Hiarcs (which stands for Hierarchical AI Research Chess System ) is one of the oldest and most respected chess engines in history. Version (with 'q' often denoting a minor revision or specific build) represents a peak in the engine’s development focusing on positional understanding and long-term strategy, rather than just raw tactical explosion. To truly appreciate its power, one must first
Using an unofficial "repack" is, in almost all cases, a violation of the software's license agreement, as these books are intended for personal use only and cannot be hosted on other websites or used for commercial purposes without permission. While you may find repacks available on third-party sites and forums, these are not endorsed by HIARCS, and their use carries significant risk. For a tool as critical as an opening book, sourcing it legitimately is the only way to ensure its integrity and your own security.
"Repack" or "Repacked" versions of the HIARCS 15q book often appear on chess forums and torrent sites. These are typically: Compilations of the quarterly updates. Compressed versions for easier downloading. It bridges the gap between raw engine calculation
: It contains positions, moves, and statistics derived from millions of top-quality Grandmaster (GM), computer, and correspondence games Analysis Features : Unlike standard game-extracted books, HIARCS books are hand-tuned and optimized to include novelties and refutations. HIARCS Chess Forums Technical Details : HIARCS tournament books are typically updated quarterly
The HIARCS 15 series offers a range of professional-grade opening books tailored for various styles of play and software environments.
The Opening Book is a high-performance chess resource released in September 2024 . It is designed for serious players and engine enthusiasts who require the latest theoretical updates and refined move recommendations. Key Technical Specifications Release Date: September 2024. Total Positions: 32,028,077. Variations: 1,875,832.
Sometimes, they include additional curated games aimed at specific tournament setups.