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Remove conthist 3 from moves loop pruning

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Followup to previous gainer that made it twice less impactful there - this patch removes it entirely as a simplification.

Passed STC:
https://tests.stockfishchess.org/tests/view/6637aa7e9819650825aa93e0
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 26208 W: 6930 L: 6694 D: 12584
Ptnml(0-2): 113, 2997, 6652, 3225, 117

Passed LTC:
https://tests.stockfishchess.org/tests/view/66383cba493aaaf4b7ea90c2
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 67866 W: 17294 L: 17118 D: 33454
Ptnml(0-2): 46, 7627, 18415, 7795, 50

closes https://github.com/official-stockfish/Stockfish/pull/5221

Bench: 2691699
This commit is contained in:
Michael Chaly 2024-05-07 09:27:04 +03:00 • committed by Joost VandeVondele
parent 3b4ddf4ae6
commit 23439e4096
1 changed files with 0 additions and 1 deletions
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src/search.cpp
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@ -990,7 +990,6 @@ moves_loop: // When in check, search starts here
int history =
(*contHist[0])[movedPiece][move.to_sq()]
+ (*contHist[1])[movedPiece][move.to_sq()]
+ (*contHist[3])[movedPiece][move.to_sq()] / 2
+ thisThread->pawnHistory[pawn_structure_index(pos)][movedPiece][move.to_sq()];
// Continuation history based pruning (~2 Elo)