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Adjust history usage in moves loop pruning

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After experiments with conthist 5 addition failed really bad divions by 2 passed as a gainer.

Passed STC:
https://tests.stockfishchess.org/tests/view/6636d7114b68b70d858035ce
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 35936 W: 9287 L: 8976 D: 17673
Ptnml(0-2): 81, 4129, 9234, 4446, 78

Passed LTC:
https://tests.stockfishchess.org/tests/view/6636ddb64b68b70d858040a8
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 82428 W: 21035 L: 20622 D: 40771
Ptnml(0-2): 29, 8985, 22775, 9394, 31

closes https://github.com/official-stockfish/Stockfish/pull/5217

Bench: 2309253
This commit is contained in:
Michael Chaly 2024-05-05 05:20:05 +03:00 • committed by Joost VandeVondele
parent 6da1590de0
commit f161261245
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -991,7 +991,7 @@ moves_loop: // When in check, search starts here
int history = int history =
(*contHist[0])[movedPiece][move.to_sq()] (*contHist[0])[movedPiece][move.to_sq()]
+ (*contHist[1])[movedPiece][move.to_sq()] + (*contHist[1])[movedPiece][move.to_sq()]
+ (*contHist[3])[movedPiece][move.to_sq()] + (*contHist[3])[movedPiece][move.to_sq()] / 2
+ thisThread->pawnHistory[pawn_structure_index(pos)][movedPiece][move.to_sq()]; + thisThread->pawnHistory[pawn_structure_index(pos)][movedPiece][move.to_sq()];
// Continuation history based pruning (~2 Elo) // Continuation history based pruning (~2 Elo)