Remove good killer reduction rule.

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 04299dbd887e26cf721df70ef4fd39bb7d1d73e5..411befdedfb460459902ffd8d9fc62fede6cc0d4 100644 (file)
--- 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)]