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Update some params for pruning at shallow depth

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Values found around 82k / 120k spsa games at 60+0.6:
https://tests.stockfishchess.org/tests/view/6681aca4481148df247298bd

Passed STC:
https://tests.stockfishchess.org/tests/view/6681c795c1657e386d2948fa
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 145216 W: 37595 L: 37122 D: 70499
Ptnml(0-2): 375, 17122, 37185, 17507, 419

Passed LTC:
https://tests.stockfishchess.org/tests/view/6681d4eec1657e386d2949e0
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 154062 W: 39117 L: 38557 D: 76388
Ptnml(0-2): 67, 16874, 42608, 17396, 86

closes https://github.com/official-stockfish/Stockfish/pull/5425

bench 996419
This commit is contained in:
Linmiao Xu 2024-06-30 17:00:49 -04:00 • committed by Joost VandeVondele
parent f6842a145c
commit 843b6f7c98
1 changed files with 5 additions and 5 deletions
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10
src/search.cpp
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@ -994,7 +994,7 @@ moves_loop: // When in check, search starts here
// Futility pruning for captures (~2 Elo)
if (!givesCheck && lmrDepth < 7 && !ss->inCheck)
{
Value futilityValue = ss->staticEval + 287 + 248 * lmrDepth
Value futilityValue = ss->staticEval + 294 + 246 * lmrDepth
+ PieceValue[capturedPiece] + captHist / 7;
if (futilityValue <= alpha)
continue;
@ -1002,7 +1002,7 @@ moves_loop: // When in check, search starts here
// SEE based pruning for captures and checks (~11 Elo)
int seeHist = std::clamp(captHist / 32, -180 * depth, 163 * depth);
if (!pos.see_ge(move, -160 * depth - seeHist))
if (!pos.see_ge(move, -163 * depth - seeHist))
continue;
}
else
@ -1013,15 +1013,15 @@ moves_loop: // When in check, search starts here
+ thisThread->pawnHistory[pawn_structure_index(pos)][movedPiece][move.to_sq()];
// Continuation history based pruning (~2 Elo)
if (lmrDepth < 6 && history < -4151 * depth)
if (lmrDepth < 6 && history < -3899 * depth)
continue;
history += 2 * thisThread->mainHistory[us][move.from_to()];
lmrDepth += history / 3678;
lmrDepth += history / 4040;
Value futilityValue =
ss->staticEval + (bestValue < ss->staticEval - 51 ? 138 : 54) + 140 * lmrDepth;
ss->staticEval + (bestValue < ss->staticEval - 51 ? 135 : 56) + 140 * lmrDepth;
// Futility pruning: parent node (~13 Elo)
if (!ss->inCheck && lmrDepth < 12 && futilityValue <= alpha)