Simplify a condition in refutes()

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>

diff --git a/src/search.cpp b/src/search.cpp
index c98a53d..f47e601 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1454,7 +1454,7 @@ moves_loop: // When in check and at SpNode search starts from here
                        | (attacks_bb<BISHOP>(m2to, occ) & pos.pieces(color_of(pc), QUEEN, BISHOP));
 
         // Verify attackers are triggered by our move and not already existing
-        if (xray && (xray ^ (xray & pos.attacks_from<QUEEN>(m2to))))
+        if (xray && (xray & ~pos.attacks_from<QUEEN>(m2to))) // Unlikely xray
             return true;
     }