Chess engine: Stockfish 22103015 NNUE for Windows and Linux (+1.53)

Stockfish 22103015 - UCI chess engine, compiled by Kurt22i
Rating CEDR=3724

Timestamp: 1667143149

Adjust reduction less at medium depths

This patch dampens the reduction increase/decrease from statScore at mid-range depths.

Inspired by patterns noticed in this tune: https://tests.stockfishchess.org/tests/view/635188930e5f47a8d0ffe8f5

Passed STC:

https://tests.stockfishchess.org/tests/view/63599dfd6b27ef94d9ec04af

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

Total: 87464 W: 23519 L: 23134 D: 40811 Elo +1.53

Ptnml(0-2): 319, 9599, 23524, 9958, 332

Passed LTC:

https://tests.stockfishchess.org/tests/view/635a73046b27ef94d9ec2313

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

Total: 154792 W: 41746 L: 41214 D: 71832 Elo +1.19

Ptnml(0-2): 79, 15181, 46349, 15703, 84

closes https://github.com/official-stockfish/Stockfish/pull/4213

Bench 4271738

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