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Free Windows x64 UCI chess engine with both Zobrist SQL databases and complete corresponding GPL source.
Built from Stockfish development source c5aef2bf and modified by Clive Spencer.
Includes Stage 7H Syzygy Ready Warmup, instant Syzygy moves, Syzygy result display, SQL own learning, opponent database comparison and the SQL opponent book.
Package: AVX2 engine, zobrist_opponents.db, zobrist_own.db, documentation, checksums and corresponding source.
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Engine archive
Explore six curated records covering proven controls, validated engines, SQL systems, companion tools and production utilities.
Open engine history and evidenceLatest processing evidence
Syzygy PGN Clean Correct v3.16 processed 2,833 games, wrote 2,545, corrected 45 unique games and completed 1,984 engine searches with no watchdog timeouts or worker restarts.
Open the daily report