X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fsearch.cpp;h=2218336775cb8fc58ead6028efd840f60d050c64;hp=40561544ab00a872947d6fef00db1364de71dfaf;hb=1a3449676182bba94ac3995c0f56781199db17eb;hpb=19dd0de4ff83e682bafa56d27f302d8f00d3040d

diff --git a/src/search.cpp b/src/search.cpp
index 40561544..22183367 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1092,8 +1092,11 @@ split_point_start: // At split points actual search starts from here
             // Increase history value of the cut-off move
             Value bonus = Value(int(depth) * int(depth));
             Hist.update(pos.piece_moved(bestMove), to_sq(bestMove), bonus);
-            Square prevSq = to_sq((ss-1)->currentMove);
-            Refutation.update(pos.piece_on(prevSq), prevSq, bestMove);
+            if (is_ok((ss-1)->currentMove))
+            {
+                Square prevSq = to_sq((ss-1)->currentMove);
+                Refutation.update(pos.piece_on(prevSq), prevSq, bestMove);
+            }
 
             // Decrease history of all the other played non-capture moves
             for (int i = 0; i < playedMoveCount - 1; i++)