The "15q" package provides three distinct formats to suit different chess software:
The HIARCS 15q book is built on a massive dataset of top-quality games, including , elite correspondence games , and high-level computer matches . HIARCS Chess Explorer Pro for PC Chess Hiarcs 15q Openings Book Includes Ctg And...
The is a high-performance tournament resource released in September 2024, containing over 32 million positions and 1.87 million variations . Designed for both elite human preparation and engine competition, it includes the critical CTG , HBG , and HCS file formats to ensure compatibility across a wide range of platforms . Key Formats Included The "15q" package provides three distinct formats to
The native format used directly by the HIARCS engine in various environments. Many users consider this format superior for engine-to-engine matches because it supports specific "learning" features where the engine can record its own results. Content and Performance Key Formats Included The native format used directly
Specifically used for HIARCS Chess Explorer (Pro) and the HIARCS iOS apps. This format is optimized for HIARCS's own search algorithms and is often used by mobile players who want a full-strength book on the go.
The standard format for ChessBase GUIs (Fritz, Komodo, Houdini). It allows users to "optimize" the book to prioritize tournament-ready moves.