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Only evaluate the PSQT part of the small net for large evals.

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Thanks to Viren6 for suggesting to set complexity to 0.

STC https://tests.stockfishchess.org/tests/view/65d7d6709b2da0226a5a203f
LLR: 2.92 (-2.94,2.94) <0.00,2.00>
Total: 328384 W: 85316 L: 84554 D: 158514
Ptnml(0-2): 1414, 39076, 82486, 39766, 1450

LTC https://tests.stockfishchess.org/tests/view/65dce6d290f639b028a54d2e
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 165162 W: 41918 L: 41330 D: 81914
Ptnml(0-2): 102, 18332, 45124, 18922, 101

closes https://github.com/official-stockfish/Stockfish/pull/5083

bench: 1504003
This commit is contained in:
mstembera
2024-02-29 14:27:00 -08:00
committed by Joost VandeVondele
parent 0a3eb1d8fa
commit 7831131591
6 changed files with 193 additions and 148 deletions
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src/evaluate.cpp
+3 -2
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@@ -194,11 +194,12 @@ Value Eval::evaluate(const Position& pos, int optimism) {
int simpleEval = simple_eval(pos, pos.side_to_move());
bool smallNet = std::abs(simpleEval) > 1050;
bool psqtOnly = std::abs(simpleEval) > 2500;
int nnueComplexity;
Value nnue = smallNet ? NNUE::evaluate<NNUE::Small>(pos, true, &nnueComplexity)
: NNUE::evaluate<NNUE::Big>(pos, true, &nnueComplexity);
Value nnue = smallNet ? NNUE::evaluate<NNUE::Small>(pos, true, &nnueComplexity, psqtOnly)
: NNUE::evaluate<NNUE::Big>(pos, true, &nnueComplexity, false);
// Blend optimism and eval with nnue complexity and material imbalance
optimism += optimism * (nnueComplexity + std::abs(simpleEval - nnue)) / 512;