Chess engine: Stockfish 23020217 NNUE for Windows and Linux (+3.05)

Stockfish 23020217 - UCI chess engine, compiled by Michael Chaly
Rating CEDR=3708

Timestamp: 1675357214

Do less SEE pruning in qsearch

Current master prunes all moves with negative SEE values in qsearch. This patch sets constant negative threshold thus allowing some moves with negative SEE values to be searched. Value of threshold is completely arbitrary and can be tweaked - also it as function of depth can be tried.

Original idea by author of Alexandria engine.

Passed STC

https://tests.stockfishchess.org/tests/view/63d79a59a67dd929a5564976

LLR: 2.94 (-2.94,2.94) <0.00,2.00>

Total: 34864 W: 9392 L: 9086 D: 16386 Elo +3.05

Ptnml(0-2): 113, 3742, 9429, 4022, 126

Passed LTC

https://tests.stockfishchess.org/tests/view/63d8074aa67dd929a5565bc2

LLR: 2.95 (-2.94,2.94) <0.50,2.50>

Total: 91616 W: 24532 L: 24126 D: 42958 Elo +1.54

Ptnml(0-2): 32, 8840, 27662, 9238, 36

closes https://github.com/official-stockfish/Stockfish/pull/4376