Tweak history initialization

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 7019635dd34b6f4015822541621174fe5b90cb11..3c2ae3e52df8b0c43f8cc05a132c2adb801bef81 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1549,8 +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