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 2.80 061025 what's new?
Summary
I recorded canonical metadata for NNUE files (resolved path and timestamp) and purged them when the network is invalidated to maintain cache consistency.
I normalized the loading of NNUE networks from disk to reuse weights when the file has not changed and to document the origin of embedded networks.
I added a summary of reusable material in the evaluation to help decide which NNUE network to use without repeating piece counts or imbalances.
Updated the engine name constant and build defaults so binaries and UCI metadata now report Wordfish-2.80-061025.
Refreshed documentation and helper scripts to reference the new engine identifier for packaging, tuning, perft, and match automation workflows.
Checked the latest upstream Stockfish patch (ee243f0f, “Remove x86-64-vnni256 target”) and confirmed it has not been integrated yet because the local build system still exposes the x86-64-vnni256 target.
Wordfish 1.0 vs other engines:
| Defenchess 2.3 JA | 19/20 | +18 | 20 Games |
| Rebel Extreme 1.1 | 17.5/20 | +15 | 20 Games |
| Integral 7 dev.8bab JA | 11/20 | +2 | 20 Games |
| Spirit 100825 | 10/20 | +0 | 20 Games |
| Spirit 040825 | 10/20 | +0 | 20 Games |
| Senpai 2.0 JA | 18.5/19 | +18 | 19 Games |
| Omega 10 | 9.5/18 | +1 | 18 Games |
| Yuliana 7.0 | 9/18 | +0 | 18 Games |
| SF-PRO2 02.05.2025 | 9/18 | +0 | 18 Games |
| YuliGM Pro 20 | 9/18 | +0 | 18 Games |
| Stockfish dev-20250809 | 9/18 | +0 | 18 Games |
| Trout 1.0 JA | 10/10 | +10 | 10 Games |
| Pounce 1.2.4.8 JA | 10/10 | +10 | 10 Games |
| Petrel 1.0 JA | 10/10 | +10 | 10 Games |
| Molybdenum 4.1 JA | 9.5/10 | +9 | 10 Games |
| Fire 10 mingw | 6.5/10 | +3 | 10 Games |
| Pawn 4.0.4 JA | 6.5/10 | +3 | 10 Games |
| Fisherov chess monk 1.2 | 5.5/10 | +1 | 10 Games |
| Yuliirma 5.0 | 5/10 | +0 | 10 Games |
| Stockfish 17.1 | 5/10 | +0 | 10 Games |
| Alexandria 8.1.0 | 5/10 | +0 | 10 Games |
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