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Simplify second probcut to linear function of depth

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Passed non-regression STC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 57472 W: 14962 L: 14765 D: 27745
Ptnml(0-2): 140, 6715, 14817, 6936, 128
https://tests.stockfishchess.org/tests/view/680df1063629b02d74b15b69

Passed non-regression LTC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 88416 W: 22499 L: 22348 D: 43569
Ptnml(0-2): 31, 9565, 24874, 9698, 40
https://tests.stockfishchess.org/tests/view/680df3a93629b02d74b15b7d

closes https://github.com/official-stockfish/Stockfish/pull/6035

Bench: 1792000
This commit is contained in:
Daniel Monroe
2025-04-27 01:55:17 -07:00
committed by Disservin
parent 3e26d3acc7
commit af3692b2d0
1 changed files with 1 additions and 7 deletions
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8
src/search.cpp
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@@ -111,12 +111,6 @@ Value to_corrected_static_eval(const Value v, const int cv) {
return std::clamp(v + cv / 131072, VALUE_TB_LOSS_IN_MAX_PLY + 1, VALUE_TB_WIN_IN_MAX_PLY - 1);
}
constexpr int adaptiveProbcutMargin[32] = {148, 150, 212, 214, 276, 278, 280, 282, 344, 346, 348,
350, 352, 354, 356, 358, 420, 422, 424, 426, 428, 430,
430, 430, 430, 430, 430, 430, 430, 430, 430, 430};
void update_correction_history(const Position& pos,
Stack* const ss,
Search::Worker& workerThread,
@@ -989,7 +983,7 @@ Value Search::Worker::search(
moves_loop: // When in check, search starts here
// Step 12. A small Probcut idea
probCutBeta = beta + adaptiveProbcutMargin[std::min(depth, 31)];
probCutBeta = beta + 180 + depth * 20;
if ((ttData.bound & BOUND_LOWER) && ttData.depth >= depth - 4 && ttData.value >= probCutBeta
&& !is_decisive(beta) && is_valid(ttData.value) && !is_decisive(ttData.value))
return probCutBeta;