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Simplify blending nnue complexity with optimism

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Passed non-regression STC:
https://tests.stockfishchess.org/tests/view/6478a26d54dd118e1d98f21c
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 241248 W: 64058 L: 64063 D: 113127
Ptnml(0-2): 644, 26679, 65960, 26720, 621

Passed non-regression LTC:
https://tests.stockfishchess.org/tests/view/647b464854dd118e1d9928b2
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 24336 W: 6658 L: 6451 D: 11227
Ptnml(0-2): 8, 2316, 7312, 2525, 7

closes https://github.com/official-stockfish/Stockfish/pull/4602

bench 2425813
This commit is contained in:
Linmiao Xu
2023-06-01 09:50:19 -04:00
committed by Joost VandeVondele
parent 06186b786e
commit 6cf8d938c5
1 changed files with 2 additions and 4 deletions
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6
src/evaluate.cpp
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@@ -1070,10 +1070,8 @@ Value Eval::evaluate(const Position& pos) {
Value nnue = NNUE::evaluate(pos, true, &nnueComplexity);
// Blend nnue complexity with (semi)classical complexity
nnueComplexity = 25 * (nnueComplexity + abs(psq - nnue)) / 64;
optimism += optimism * nnueComplexity / 256;
// Blend optimism with nnue complexity and (semi)classical complexity
optimism += 25 * optimism * (nnueComplexity + abs(psq - nnue)) / 16384;
v = (nnue * (945 + npm) + optimism * (174 + npm)) / 1024;
}