Chess engine: Stockfish 22021720 NNUE for Windows and Linux, +15,72 ELO progress!

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Stockfish - UCI chess engine, compiled by Michael Chaly
Rating CEDR=3577 (1 place)

Timestamp: 1645127121
Tune search at very long time control
This patch is a result of tuning done by user @candirufish after 150k games.

Since the tuned values were really interesting and touched heuristics that are known for their non-linear scaling I decided to run limited games LTC match, even if the STC test was really bad (which was expected). After seeing the results of the LTC match, I also run a VLTC (very long time control) SPRTtest, which passed.

The main difference is in extensions: this patch allows much more singular/double extensions, both in terms of allowing them at lower depths and with lesser margins.

Failed STC:
https://tests.stockfishchess.org/tests/view/620d66643ec80158c0cd3b46
LLR: -2.94 (-2.94,2.94) <0.00,2.50>
Total: 4968 W: 1194 L: 1398 D: 2376 Elo -14.27
Ptnml(0-2): 47, 633, 1294, 497, 13

Performed well at LTC in a fixed-length match:
https://tests.stockfishchess.org/tests/view/620d66823ec80158c0cd3b4a
ELO: 3.36 +-1.8 (95%) LOS: 100.0%
Total: 30000 W: 7966 L: 7676 D: 14358 Elo +3.36
Ptnml(0-2): 36, 2936, 8755, 3248, 25

Passed VLTC SPRT test:
https://tests.stockfishchess.org/tests/view/620da11a26f5b17ec884f939
LLR: 2.96 (-2.94,2.94) <0.50,3.00>
Total: 4400 W: 1326 L: 1127 D: 1947 Elo +15.72
Ptnml(0-2): 13, 309, 1348, 526, 4
Bench: 6318903

Stockfish 22021720 NNUE download

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