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Remove good killer reduction rule.

Browse source 
STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 246544 W: 65646 L: 65657 D: 115241
Ptnml(0-2): 706, 27350, 67138, 27405, 673
https://tests.stockfishchess.org/tests/view/642e253277ff3301150e9aa2

LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 165136 W: 44878 L: 44809 D: 75449
Ptnml(0-2): 64, 15991, 50378, 16082, 53
https://tests.stockfishchess.org/tests/view/6430db07028b029b01acd87f

closes https://github.com/official-stockfish/Stockfish/pull/4519

Bench: 3746080
This commit is contained in:
Stefan Geschwentner 2023-04-11 01:20:29 +02:00 • committed by Joost VandeVondele
parent f66c36277f
commit 9829bceda9
1 changed files with 0 additions and 5 deletions
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5
src/search.cpp
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@ -1187,11 +1187,6 @@ moves_loop: // When in check, search starts here
if ((ss+1)->cutoffCnt > 3)
r++;
// Decrease reduction if move is a killer and we have a good history (~1 Elo)
if (move == ss->killers[0]
&& (*contHist[0])[movedPiece][to_sq(move)] >= 3722)
r--;
ss->statScore = 2 * thisThread->mainHistory[us][from_to(move)]
+ (*contHist[0])[movedPiece][to_sq(move)]
+ (*contHist[1])[movedPiece][to_sq(move)]