Tweak history initialization

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 4b6b497a5b49b504031519b5fcb8137d6a76d1b9..3c2ae3e52df8b0c43f8cc05a132c2adb801bef81 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1002,8 +1002,7 @@ moves_loop: // When in check, search starts here
               || givesCheck)
           {
               // Futility pruning for captures (~0 Elo)
-              if (   !pos.empty(to_sq(move))
-                  && !givesCheck
+              if (   !givesCheck
                   && !PvNode
                   && lmrDepth < 7
                   && !ss->inCheck
@@ -1550,8 +1549,8 @@ moves_loop: // When in check, search starts here
       // Continuation history based pruning (~2 Elo)
       if (   !capture
           && bestValue > VALUE_TB_LOSS_IN_MAX_PLY
-          && (*contHist[0])[pos.moved_piece(move)][to_sq(move)] < CounterMovePruneThreshold
-          && (*contHist[1])[pos.moved_piece(move)][to_sq(move)] < CounterMovePruneThreshold)
+          && (*contHist[0])[pos.moved_piece(move)][to_sq(move)] < 0
+          && (*contHist[1])[pos.moved_piece(move)][to_sq(move)] < 0)
           continue;
 
       // movecount pruning for quiet check evasions