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Chess engine: Stockfish 21060321 (Windows and Linux)

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Stockfish - UCI chess engine, compiled by Xoto10
Rating JCER=3144

Timestamp: 1622748176
Make extra time for bestMoveInstability dependent on rootdepth.

This change allocates more base time to moves and makes the additional time added for best move instability dependent on rootdepth.

STC 10+0.1 :
LLR: 2.94 (-2.94,2.94) <-0.50,2.50>
Total: 19432 W: 1711 L: 1553 D: 16168 Elo +2.83
Ptnml(0-2): 47, 1250, 6989, 1358, 72
https://tests.stockfishchess.org/tests/view/60b8cd41457376eb8bcaa1ad

LTC 60+0.6 :
LLR: 2.93 (-2.94,2.94) <0.50,3.50>
Total: 22480 W: 810 L: 693 D: 20977 Elo +1.81
Ptnml(0-2): 9, 603, 9902, 714, 12
https://tests.stockfishchess.org/tests/view/60b8e5bf457376eb8bcaa1e6
Bench 4364128

Stockfish 21060321 and NNUE download

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