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Chess engine: Stockfish 20092108 and NNUE

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Stockfish - UCI chess engine, compiled by Stefan Geschwentner
Rating JCER=3294

Timestamp: 1600669150
Tweak hybrid treshold.

Increase the first hybrid threshold with more material. Rewrite the hybrid rules for clarity.

STC:
LLR: 2.94 (-2.94,2.94) {-0.25,1.25}
Total: 24416 W: 3039 L: 2848 D: 18529 Elo +2.72
Ptnml(0-2): 135, 2136, 7503, 2271, 163
https://tests.stockfishchess.org/tests/view/5f6451efbb0cae038ca8f4dc

LTC;
LLR: 2.95 (-2.94,2.94) {0.25,1.25}
Total: 65016 W: 3702 L: 3455 D: 57859 Elo +1.32
Ptnml(0-2): 66, 2991, 26157, 3218, 76
https://tests.stockfishchess.org/tests/view/5f64b143bb0cae038ca8f51f

Bench: 3973739
Stockfish 20092108 and NNUE download

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