From 9829bceda90d025a5f5d7c04457902413e367041 Mon Sep 17 00:00:00 2001 From: Stefan Geschwentner Date: Tue, 11 Apr 2023 01:20:29 +0200 Subject: [PATCH] Remove good killer reduction rule. 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 --- src/search.cpp | 5 ----- 1 file changed, 5 deletions(-) diff --git a/src/search.cpp b/src/search.cpp index 04299dbd..411befde 100644 --- a/src/search.cpp +++ b/src/search.cpp @@ -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)] -- 2.39.2