Fix Tsume mode speed regression

diff --git a/src/position.cpp b/src/position.cpp
index 63e37df..9d4575d 100644 (file)
--- a/src/position.cpp
+++ b/src/position.cpp
@@ -1927,7 +1927,7 @@ bool Position::is_immediate_game_end(Value& result, int ply) const {
       }
   }
   // Tsume mode: Assume that side with king wins when not in check
-  if (Options["TsumeMode"] && count<KING>(sideToMove) && !checkers())
+  if (!count<KING>(~sideToMove) && count<KING>(sideToMove) && !checkers() && Options["TsumeMode"])
   {
       result = mate_in(ply);
       return true;