Grail - UCI chess engine
Author: Jørgen Hanssen
After working on it for a while, I feel my hobby chess engine is finally ready for v1.0.0. Not cutting edge, but plays a solid game.
Grail uses modern search techniques and evaluates positions using a simple NNUE trained on 500 million positions from self-play.
Development continues in my spare time, and I plan to release updates with several missing features and improvements like threading, tablebase support, and pondering. But don't worry! Grail supports all standard UCI time controls and analysis modes, so it works seamlessly with your favorite GUI for matches and analysis.
Grail 1.0.2 what's new?
Improvements
Smarter depth management when the transposition table doesn't have a best move cached (IIR).
Late move reductions now applied at the root level for better time efficiency.
Improved move ordering when escaping from check - prioritizes king safety and uses cheaper pieces as blockers.
More aggressive pruning using transposition table upper bounds.
Elo gain over 1.0.1
STC (10+0.1): +28.9 ± 5.2 Elo (10k games)
LTC (60+1.0): +22.6 ± 10.4 Elo (2k games)
Downloads
x86-64-v4: Modern CPUs with AVX-512 (2017+)
x86-64-v3: CPUs with AVX2 (2013+)
arm64: Apple Silicon
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