Chess engine: Stockfish 23020216 NNUE for Windows and Linux (+2.38)

Stockfish 23020216 - UCI chess engine, compiled by Muzhen Gaming
Rating CEDR=3708

Timestamp: 1675356357

Decrease reduction for killer moves with good history

If move is a main killer and we have a good history, decrease reduction.

STC: https://tests.stockfishchess.org/tests/view/63d38b37721fe2bff693069a

LLR: 2.95 (-2.94,2.94) <0.00,2.00>

Total: 46688 W: 12542 L: 12222 D: 21924 Elo +2.38

Ptnml(0-2): 126, 5013, 12769, 5287, 149

LTC: https://tests.stockfishchess.org/tests/view/63d471e2bde6e5f3cb4be5d3

LLR: 2.93 (-2.94,2.94) <0.50,2.50>

Total: 130976 W: 35033 L: 34555 D: 61388 Elo +1.27

Ptnml(0-2): 38, 12551, 39833, 13027, 39

closes https://github.com/official-stockfish/Stockfish/pull/4369

Bench: 4069938

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