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CMH Pruning Tweak

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replace CounterMovePruneThreshold by a depth dependent threshold

STC:
LLR: 2.94 (-2.94,2.94) <-0.50,2.50>
Total: 35512 W: 2718 L: 2552 D: 30242
Ptnml(0-2): 66, 2138, 13194, 2280, 78
https://tests.stockfishchess.org/tests/view/6104442fafad2da4f4ae3b94

LTC:
LLR: 2.96 (-2.94,2.94) <0.50,3.50>
Total: 36536 W: 1150 L: 1019 D: 34367
Ptnml(0-2): 10, 920, 16278, 1049, 11
https://tests.stockfishchess.org/tests/view/6104b033afad2da4f4ae3bbc

closes https://github.com/official-stockfish/Stockfish/pull/3636

Bench: 5848718
This commit is contained in:
VoyagerOne 2021-07-31 08:18:49 -04:00 • committed by Joost VandeVondele
parent 26edf9534a
commit a0fca67da4
1 changed files with 3 additions and 3 deletions
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6
src/search.cpp
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@ -907,7 +907,7 @@ namespace {
&& !ttMove) && !ttMove)
depth -= 2; depth -= 2;
moves_loop: // When in check, search starts from here moves_loop: // When in check, search starts here
ttCapture = ttMove && pos.capture_or_promotion(ttMove); ttCapture = ttMove && pos.capture_or_promotion(ttMove);
@ -1017,8 +1017,8 @@ moves_loop: // When in check, search starts from here
{ {
// Continuation history based pruning (~20 Elo) // Continuation history based pruning (~20 Elo)
if ( lmrDepth < 5 if ( lmrDepth < 5
&& (*contHist[0])[movedPiece][to_sq(move)] < CounterMovePruneThreshold && (*contHist[0])[movedPiece][to_sq(move)] < (depth == 1 ? 0 : -stat_bonus(depth-1))
&& (*contHist[1])[movedPiece][to_sq(move)] < CounterMovePruneThreshold) && (*contHist[1])[movedPiece][to_sq(move)] < (depth == 1 ? 0 : -stat_bonus(depth-1)))
continue; continue;
// Futility pruning: parent node (~5 Elo) // Futility pruning: parent node (~5 Elo)