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Quadratic smallnet threshold with re-evaluation

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The threshold now decreases more quickly as pawn count decreases,
using the smallnet more compared to before.

Combo of two eval patches:
https://tests.stockfishchess.org/tests/view/66576c5f6b0e318cefa8d26e
https://tests.stockfishchess.org/tests/view/664ced40830eb9f886616a77

Passed STC:
https://tests.stockfishchess.org/tests/view/66588c136b0e318cefa8ff21
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 112608 W: 29336 L: 28908 D: 54364
Ptnml(0-2): 344, 13223, 28718, 13699, 320

Passed LTC:
https://tests.stockfishchess.org/tests/view/6658c8786b0e318cefa900f5
LLR: 2.96 (-2.94,2.94) <0.50,2.50>
Total: 108288 W: 27493 L: 27026 D: 53769
Ptnml(0-2): 54, 11821, 29930, 12282, 57

closes https://github.com/official-stockfish/Stockfish/pull/5323

bench 1728074
This commit is contained in:
Linmiao Xu
2024-05-29 13:56:15 -04:00
committed by Joost VandeVondele
parent de1ae4949d
commit 0ef809ac71
1 changed files with 3 additions and 2 deletions
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src/evaluate.cpp
+3 -2
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@@ -46,7 +46,8 @@ int Eval::simple_eval(const Position& pos, Color c) {
bool Eval::use_smallnet(const Position& pos) { bool Eval::use_smallnet(const Position& pos) {
int simpleEval = simple_eval(pos, pos.side_to_move()); int simpleEval = simple_eval(pos, pos.side_to_move());
return std::abs(simpleEval) > 992 + 6 * pos.count<PAWN>(); int pawnCount = pos.count<PAWN>();
return std::abs(simpleEval) > 992 + 6 * pawnCount * pawnCount / 16;
} }
// Evaluate is the evaluator for the outer world. It returns a static evaluation // Evaluate is the evaluator for the outer world. It returns a static evaluation
@@ -67,7 +68,7 @@ Value Eval::evaluate(const Eval::NNUE::Networks& networks,
: networks.big.evaluate(pos, &caches.big, true, &nnueComplexity); : networks.big.evaluate(pos, &caches.big, true, &nnueComplexity);
// Re-evaluate the position when higher eval accuracy is worth the time spent // Re-evaluate the position when higher eval accuracy is worth the time spent
if (smallNet && nnue * simpleEval < 0) if (smallNet && (nnue * simpleEval < 0 || std::abs(nnue) < 250))
{ {
nnue = networks.big.evaluate(pos, &caches.big, true, &nnueComplexity); nnue = networks.big.evaluate(pos, &caches.big, true, &nnueComplexity);
smallNet = false; smallNet = false;