Extend discovered checks regardless of SEE

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index de67560a808a701ef11299bf7d6a3b8fb1753246..651bd95b6feff4ceecc70840ef82fb37bafbb86d 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -953,11 +953,13 @@ moves_loop: // When in check, search starts from here
           else if (cutNode && singularBeta > beta)
               return beta;
       }
-      else if (    givesCheck // Check extension (~2 Elo)
-               &&  pos.see_ge(move))
+
+      // Check extension (~2 Elo)
+      else if (    givesCheck
+               && (pos.blockers_for_king(~us) & from_sq(move) || pos.see_ge(move)))
           extension = ONE_PLY;
 
-      // Extension if castling
+      // Castling extension
       else if (type_of(move) == CASTLING)
           extension = ONE_PLY;