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Chess engine: Stockfish 21112519 NNUE (Windows and Linux)

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Stockfish - UCI chess engine, compiled by Michael Chaly
Rating CEDR=3375 (1 place)

Timestamp: 1637865483
Use fraction of history heuristics in futility pruning

This idea is somewhat of a respin of smth we had in futility pruning and that was simplified away - dependence of it not only on static evaluation of position but also on move history heuristics. Instead of aborting it when they are high there we use fraction of their sum to adjust static eval pruning criteria.

passed STC
https://tests.stockfishchess.org/tests/view/619bd438c0a4ea18ba95a27d
LLR: 2.93 (-2.94,2.94) <0.00,2.50>
Total: 113704 W: 29284 L: 28870 D: 55550 Elo +1.27
Ptnml(0-2): 357, 12884, 30044, 13122, 445

passed LTC
https://tests.stockfishchess.org/tests/view/619cb8f0c0a4ea18ba95a334
LLR: 2.96 (-2.94,2.94) <0.50,3.00>
Total: 147136 W: 37307 L: 36770 D: 73059 Elo +1.27
Ptnml(0-2): 107, 15279, 42265, 15804, 113
bench 6777918

Stockfish 21112519 NNUE download

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