The "15q" version represents a specific, highly optimized iteration of their 2023/2024 theory, including recent novelties played by Grandmasters and Top Engine lines.
: Utilizing a professional tournament book can contribute more to a player's or engine's strength than an engine update alone, often adding an average of 40 Elo points of performance per year. Format Support: CTG and HCS chess hiarcs 15q openings book includes ctg and repack