Wordfish is a free, open-source UCI chess engine implementing cutting-edge search algorithms combined with neural network evaluation. Derived from fundamental chess programming principles, Wordfish analyzes positions through parallelized alpha-beta search enhanced with null-move pruning and late move reductions.
Author: Jorge Ruiz Centelles and the Stockfish developers
Wordfish 3.20 101125 what's new?
Added UCI options to enable the live book, configure its endpoint, timeout, depth, diversity, contribution flag, and the Lichess tablebase URL exposed by the engine.
Updated the search/livebook stack to sanitize configurable URLs, apply configurable cURL timeouts, reuse ChessDB defaults, and expose helpers for building Lichess tablebase queries.
Routed Lichess endgame and tablebase lookups through the shared URL builder with graceful fallbacks when the user clears the endpoint.
Updated the README to present the Wordfish-3.20-101125 branding and describe the new binary identifier example for builders.
Set the engine name constants and build defaults to Wordfish-3.20-101125 so GUIs display the rebranded identity consistently.
Refreshed the changelog and tooling scripts to reference the Wordfish-3.20-101125 executable name throughout the project.
Wordfish 3.10 011125 vs other engines:
| Stockfish 17.1 | 10/22 | -2 | 22 games |
| SugaR 1.0.1 | 9.5/22 | -3 | 22 games |
| ShashChess 40 | 8.5/18 | -1 | 18 games |
| Stockfish dev-20251102 | 8.5/18 | -1 | 18 games |
| HypnoS 1.00 | 7.5/18 | -3 | 18 games |
| DarkSeid 7.0 EE | 6.5/16 | -3 | 16 games |
| SpecTral 11 | 6.5/14 | -1 | 14 games |
| CorChess 20251005 | 6.5/14 | -1 | 14 games |
| JudaS 1.0.1 | 6.5/14 | -1 | 14 games |
| Brainlearn 31 | 6/14 | -2 | 14 games |
| Killfish PB 151025 | 6/14 | -2 | 14 games |
| Artemis 18.8TR | 6/14 | -2 | 14 games |
| Kookaburra 3.11 | 5/14 | -4 | 14 games |
| Revolution 3.10 051125 | 4.5/14 | -5 | 14 games |
| Revolution 3.0 011125 | 4/8 | +0 | 8 games |
| PlentyChess 7.0.12 | 4/8 | +0 | 8 games |
| Tactical Titan 5.7 | 3.5/8 | -1 | 8 games |
| Solistafish Sep25 PB | 3.5/8 | -1 | 8 games |
| Deep Blue | 3/8 | -2 | 8 games |
| Revolution 3.40 081125 | 2.5/8 | -3 | 8 games |
| Omega Explorer 121025 | 3/6 | +0 | 6 games |
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