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Tweak the stats bonus and malus

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For depth 1 we don't have a negative score anymore.

Passed STC:
https://tests.stockfishchess.org/tests/view/65fb055c0ec64f0526c5024f
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 117120 W: 30468 L: 30023 D: 56629
Ptnml(0-2): 526, 13759, 29539, 14216, 520

Passed LTC:
https://tests.stockfishchess.org/tests/view/65fdca4b0ec64f0526c5293f
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 54816 W: 13955 L: 13595 D: 27266
Ptnml(0-2): 30, 6046, 14897, 6404, 31

closes https://github.com/official-stockfish/Stockfish/pull/5134

Bench: 1876428
This commit is contained in:
FauziAkram
2024-03-24 14:02:27 +03:00
committed by Disservin
parent 7998570414
commit d49b3738bc
1 changed files with 3 additions and 3 deletions
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6
src/search.cpp
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@@ -74,10 +74,10 @@ Value to_corrected_static_eval(Value v, const Worker& w, const Position& pos) {
} }
// History and stats update bonus, based on depth // History and stats update bonus, based on depth
int stat_bonus(Depth d) { return std::min(223 * d - 332, 1258); } int stat_bonus(Depth d) { return std::clamp(245 * d - 320, 0, 1296); }
// History and stats update malus, based on depth // History and stats update malus, based on depth
int stat_malus(Depth d) { return std::min(536 * d - 299, 1353); } int stat_malus(Depth d) { return (d < 4 ? 554 * d - 303 : 1203); }
// Add a small random component to draw evaluations to avoid 3-fold blindness // Add a small random component to draw evaluations to avoid 3-fold blindness
Value value_draw(size_t nodes) { return VALUE_DRAW - 1 + Value(nodes & 0x2); } Value value_draw(size_t nodes) { return VALUE_DRAW - 1 + Value(nodes & 0x2); }
@@ -1709,7 +1709,7 @@ void update_all_stats(const Position& pos,
if (!pos.capture_stage(bestMove)) if (!pos.capture_stage(bestMove))
{ {
int bestMoveBonus = bestValue > beta + 173 ? quietMoveBonus // larger bonus int bestMoveBonus = bestValue > beta + 168 ? quietMoveBonus // larger bonus
: stat_bonus(depth); // smaller bonus : stat_bonus(depth); // smaller bonus
// Increase stats for the best move in case it was a quiet move // Increase stats for the best move in case it was a quiet move