tablebase

Exhaustive helpmate tablebases for chess problem composers — CLI, API and Website for helpmate tablebases of fixed material. Datasets at https://huggingface.co/datasets/osick/helpmate-tables complete through 5 pieces. For 6 and 7 pieces contributions wanted.

Confronts lichess puzzles V2 to syzygy tablebase

Independent checks and tools for chesstb endgame tablebases and cdb: a reference generator, DTM50 PV walker, prober client, benchmarks and a PV trust metric.

SkyLance C++20 UCI chess engine and Syzygy endgame reader, with auditable correctness and performance evidence.

Every American checkers (English draughts) position with four pieces or fewer, solved exactly: 6,408,836 positions with win/loss/draw and the exact distance to the end. 1.8 MB, CC BY 4.0, with a dependency-free Python reader.