Chess engine: Stockfish 20090822 and NNUE

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

Timestamp: 1599598568

Double probability of using classical eval

This patch doubles the moderate imbalance threshold and probability of using classical eval.

So now if imbalance is greater than PawnValueMg / 4 then there is a 1/8 chance of using classical eval.

STC:

LLR: 2.93 (-2.94,2.94) {-0.25,1.25}

Total: 10984 W: 1303 L: 1140 D: 8541 Elo +5.16

Ptnml(0-2): 58, 867, 3489, 1010, 68

https://tests.stockfishchess.org/tests/view/5f554c9f97da2d5437d3813e

LTC:

LLR: 2.95 (-2.94,2.94) {0.25,1.25}

Total: 43064 W: 2476 L: 2276 D: 38312 Elo +1.61

Ptnml(0-2): 37, 1985, 17308, 2145, 57

https://tests.stockfishchess.org/tests/view/5f55690a00a0aa2ca79f0a43

Bench: 4161067

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