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Update 2 search parameters after tune.

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A tuning run on 3 search parameters was done with 200k games, narrow ranges (50-150%) and a small value for A (3% of total games) :
https://tests.stockfishchess.org/tests/view/613b5f4b689039fce12e1220

STC 10+0.1 :
LLR: 2.95 (-2.94,2.94) <-0.50,2.50>
Total: 73112 W: 18800 L: 18520 D: 35792
Ptnml(0-2): 205, 8395, 19115, 8597, 244
https://tests.stockfishchess.org/tests/view/613cb8d2689039fce12e1308

LTC 60+0.6 :
LLR: 2.95 (-2.94,2.94) <0.50,3.50>
Total: 45616 W: 11604 L: 11321 D: 22691
Ptnml(0-2): 24, 4769, 12946, 5038, 31
https://tests.stockfishchess.org/tests/view/613d07048253e53e97b55b32

closes https://github.com/official-stockfish/Stockfish/pull/3698

Bench 6504816
This commit is contained in:
xoto10 2021-09-12 09:19:38 +01:00 • committed by Joost VandeVondele
parent 30fdbf4328
commit fd5e77950e
1 changed files with 4 additions and 4 deletions
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8
src/search.cpp
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@ -793,7 +793,7 @@ namespace {
&& (ss-1)->statScore < 23767
&& eval >= beta
&& eval >= ss->staticEval
&& ss->staticEval >= beta - 20 * depth - 22 * improving + 168 * ss->ttPv + 159
&& ss->staticEval >= beta - 20 * depth - 22 * improving + 168 * ss->ttPv + 177
&& !excludedMove
&& pos.non_pawn_material(us)
&& (ss->ply >= thisThread->nmpMinPly || us != thisThread->nmpColor))
@ -1032,7 +1032,7 @@ moves_loop: // When in check, search starts here
// Futility pruning: parent node (~5 Elo)
if ( !ss->inCheck
&& lmrDepth < 7
&& ss->staticEval + 174 + 157 * lmrDepth <= alpha)
&& ss->staticEval + 172 + 157 * lmrDepth <= alpha)
continue;
// Prune moves with negative SEE (~20 Elo)
@ -1101,8 +1101,8 @@ moves_loop: // When in check, search starts here
}
// Capture extensions for PvNodes and cutNodes
else if ( (PvNode || cutNode)
&& captureOrPromotion
else if ( (PvNode || cutNode)
&& captureOrPromotion
&& moveCount != 1)
extension = 1;