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 2.10 DeepJunior style 090925 what's new?
Added a new dynamic_activity_bonus evaluation term that scores mobility, attacks on the enemy king’s ring, and direct pressure, while offsetting material deficits when initiative is strong.
Integrated this activity bonus into the main evaluation flow to emphasize dynamic, aggressive play.
Added an aggressive king-safety bonus that penalizes weak pawn cover and rewards direct pressure on the enemy king, reinforcing dynamic play
Integrated the new bonus into the overall evaluation, pairing it with the existing activity scoring for heightened attack focus
Extended the search whenever a move gives check to a poorly shielded king, encouraging sacrificial lines that expose the opponent’s king
Documented the aggressive king-safety strategy in the project README and changelog for clearer user guidance.
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 |
Wordfish 2.10 DeepJunior style 090925 download mirror
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