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 2.90 191025 what's new?
As a UCI-compliant engine, Wordfish operates through **standard chess interfaces** without an integrated graphical interface. Users must employ compatible chess GUIs (Arena, Scid vs PC, etc.) for board visualization and move input. Consult your GUI documentation for implementation details.
Wordfish exposes several options for experimenting with Monte Carlo Tree Search based on Shashin's position classification. For details see [docs/mcts.md](docs/mcts.md).
Wordfish can switch to an alternative neural network using the `FalconFile` option. If a `nn-c01dc0ffeede.nnue` file is present in the engine directory it will be embedded automatically; otherwise the engine falls back to the standard networks. To load the `nn-c01dc0ffeede.nnue` file when available, send:
Wordfish 2.50 vs other engines:
| Lambergar 1.3 | 9.5/10 | +9 | 10 Games |
| Alexander 6.0 | 9.5/10 | +9 | 10 Games |
| Zangdar 5 | 6.5/10 | +3 | 10 Games |
| Halogen 15.4.2 | 6.5/10 | +3 | 10 Games |
| Revolution 2.70 dev-210925 | 5/10 | +0 | 10 Games |
| Alexandria 8.1.2 | 5/10 | +0 | 10 Games |
| Raid 4.0 | 4.5/9 | +0 | 9 Games |
| Yakka 1.3 | 7.5/8 | +7 | 8 Games |
| Rebel Extreme 1.1 | 7/8 | +6 | 8 Games |
| Fire 10 mingw | 5/8 | +2 | 8 Games |
| Caissa 1.23 | 4.5/8 | +1 | 8 Games |
| YuliGM Pro 20 | 4/8 | +0 | 8 Games |
| Spirit XXL | 4/8 | +0 | 8 Games |
| Pawnocchio 1.8.1 | 4/8 | +0 | 8 Games |
| Claw 3.0-M | 4/8 | +0 | 8 Games |
| HypnoS ++ 1.03 | 4/8 | +0 | 8 Games |
| SF SE-240825 | 4/8 | +0 | 8 Games |
| ShashChess 39.1 | 4/8 | +0 | 8 Games |
| SF-POLY 200825 | 4/8 | +0 | 8 Games |
| DarkZoryn 2.0 | 4/8 | +0 | 8 Games |
| PlentyChess 6.0.18 | 4/8 | +0 | 8 Games |
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