Less reduction for tt move.

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index e322a1c99aa5ca094c05ec186ce54dcfe55f862b..366065b8e9c3380642ab74b040c7db9f3760f7f6 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1169,6 +1169,9 @@ moves_loop: // When in check, search starts here
       if ((ss+1)->cutoffCnt > 3)
           r++;
 
+      else if (move == ttMove)
+          r--;
+
       ss->statScore =  2 * thisThread->mainHistory[us][from_to(move)]
                      + (*contHist[0])[movedPiece][to_sq(move)]
                      + (*contHist[1])[movedPiece][to_sq(move)]