Allow inCheck pruning

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 3dc17962ae92bda4f7457bcff7271ec65276b5d7..64cdb325ebce53c3a785747767cf76109b5daa31 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -728,8 +728,7 @@ namespace {
         &&  ttMove == MOVE_NONE
         &&  eval + razor_margin[depth / ONE_PLY] <= alpha)
     {
-        if (   depth <= ONE_PLY
-            && eval + razor_margin[3] <= alpha)
+        if (depth <= ONE_PLY)
             return qsearch<NonPV, false>(pos, ss, alpha, beta, DEPTH_ZERO);
 
         Value ralpha = alpha - razor_margin[depth / ONE_PLY];
@@ -920,7 +919,6 @@ moves_loop: // When in check search starts from here
 
       // Step 13. Pruning at shallow depth
       if (  !rootNode
-          && !inCheck
           &&  bestValue > VALUE_MATED_IN_MAX_PLY)
       {
           if (   !captureOrPromotion
@@ -1122,6 +1120,9 @@ moves_loop: // When in check search starts from here
     // All legal moves have been searched and if there are no legal moves, it
     // must be a mate or a stalemate. If we are in a singular extension search then
     // return a fail low score.
+
+    assert(moveCount || !inCheck || excludedMove || !MoveList<LEGAL>(pos).size());
+
     if (!moveCount)
         bestValue = excludedMove ? alpha
                    :     inCheck ? mated_in(ss->ply) : DrawValue[pos.side_to_move()];