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CMH Pruning Tweak

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Tweak pruning formula by adding up CMH values.

STC:
LLR: 2.94 (-2.94,2.94) <-0.50,2.50>
Total: 14608 W: 3837 L: 3641 D: 7130
Ptnml(0-2): 27, 1681, 3723, 1815, 58
https://tests.stockfishchess.org/tests/view/612792f362d20cf82b5ad156

LTC:
LLR: 2.94 (-2.94,2.94) <0.50,3.50>
Total: 53520 W: 13580 L: 13276 D: 26664
Ptnml(0-2): 28, 5610, 15183, 5908, 31
https://tests.stockfishchess.org/tests/view/6127d27062d20cf82b5ad191

closes https://github.com/official-stockfish/Stockfish/pull/3682

Bench: 5186641
This commit is contained in:
VoyagerOne 2021-08-27 14:25:09 -04:00 • committed by Joost VandeVondele
parent 69eede7d08
commit ad357e147a
1 changed files with 4 additions and 3 deletions
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7
src/search.cpp
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@ -1018,9 +1018,10 @@ moves_loop: // When in check, search starts here
else
{
// Continuation history based pruning (~20 Elo)
if ( lmrDepth < 5
&& (*contHist[0])[movedPiece][to_sq(move)] < 23 - 23 * depth * depth
&& (*contHist[1])[movedPiece][to_sq(move)] < 23 - 23 * depth * depth)
if (lmrDepth < 5
&& (*contHist[0])[movedPiece][to_sq(move)]
+ (*contHist[1])[movedPiece][to_sq(move)]
+ (*contHist[3])[movedPiece][to_sq(move)] < -3000 * depth + 3000)
continue;
// Futility pruning: parent node (~5 Elo)