X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fsearch.cpp;h=6bdf255c3dafee03b8b2fff95536cc7a7405fba7;hp=438c2d6fe858d85e1c72f1ed37c0ec73b74f48ce;hb=156635749bfc9fc8e71aa8c44d7bd2cfe7a78457;hpb=2ef53ee368683d5aa62b028377b94efe961f18ac

diff --git a/src/search.cpp b/src/search.cpp
index 438c2d6f..6bdf255c 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -523,6 +523,7 @@ namespace {
     bestValue = -VALUE_INFINITE;
     ss->currentMove = threatMove = (ss+1)->excludedMove = bestMove = MOVE_NONE;
     ss->ply = (ss-1)->ply + 1;
+    ss->futilityMoveCount = 0;
     (ss+1)->skipNullMove = false; (ss+1)->reduction = DEPTH_ZERO;
     (ss+2)->killers[0] = (ss+2)->killers[1] = MOVE_NONE;
 
@@ -645,6 +646,7 @@ namespace {
         && !inCheck
         &&  eval - futility_margin(depth, (ss-1)->futilityMoveCount) >= beta
         &&  abs(beta) < VALUE_MATE_IN_MAX_PLY
+        &&  abs(eval) < VALUE_KNOWN_WIN
         &&  pos.non_pawn_material(pos.side_to_move()))
         return eval - futility_margin(depth, (ss-1)->futilityMoveCount);
 
@@ -806,7 +808,6 @@ split_point_start: // At split points actual search starts from here
                         << " currmovenumber " << moveCount + PVIdx << sync_endl;
       }
 
-      ss->futilityMoveCount = 0;
       ext = DEPTH_ZERO;
       captureOrPromotion = pos.is_capture_or_promotion(move);
       givesCheck = pos.move_gives_check(move, ci);
@@ -906,6 +907,8 @@ split_point_start: // At split points actual search starts from here
           // far in the move list we are to be more aggressive in the child node.
           ss->futilityMoveCount = moveCount;
       }
+      else
+          ss->futilityMoveCount = 0;
 
       // Check for legality only before to do the move
       if (!RootNode && !SpNode && !pos.pl_move_is_legal(move, ci.pinned))