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Chess engine: Stockfish 22051413 NNUE for Windows and Linux (+3,07 ELO)

on


Stockfish - UCI chess engine, compiled by Disservin
Rating CEDR=3497 (2 place)

SE depth scaling using the previous depth
This patch makes the SE depth condition more robust and allows it to scale with completed depth from a previous search.

At long TC this patch is almost equivalent to https://github.com/official-stockfish/Stockfish/pull/4016 which had

VLTC:
https://tests.stockfishchess.org/tests/view/626abd7e8707aa698c0093a8
Elo: 2.35 +-1.5 (95%) LOS: 99.9%
Total: 40000 W: 10991 L: 10720 D: 18289 Elo +2.35
Ptnml(0-2): 8, 3534, 12648, 3799, 11
nElo: 5.47 +-3.4 (95%) PairsRatio: 1.08

VLTC multicore:
https://tests.stockfishchess.org/tests/view/6272a6afc8f14123163c1997
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 86808 W: 24165 L: 23814 D: 38829 Elo +1.40
Ptnml(0-2): 11, 7253, 28524, 7606, 10
however, it is now also gaining at LTC:

LTC:
https://tests.stockfishchess.org/tests/view/627e7cb523c0c72a05b651a9
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 27064 W: 7285 L: 7046 D: 12733 Elo +3.07
Ptnml(0-2): 8, 2446, 8390, 2675, 13

and should have nearly no influence at STC as depth 27 is rarely reached. It was noticed that initializing the threshold with MAX_PLY, had an adverse effect, possibly because the first move is sensitive to this.

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