raccrompton/bookbuilder

BookBuilder is a browser-based tool that automatically generates practical chess opening repertoires by analyzing millions of games from Lichess, validating moves with Stockfish engine analysis, and exporting results in PGN format for platforms like Chessable and ChessTempo. It's designed for chess players of all levels who want to build data-driven opening repertoires without manual research, using customizable filters for rating ranges, time controls, and analysis depth. The tool combines statistical analysis with engine validation to find moves that are both theoretically sound and practically effective in real games.