Clarify definition of capture_or_promotion()

No functional change.

diff --git a/src/position.h b/src/position.h
index 4e15bb1..9a88e1b 100644 (file)
--- a/src/position.h
+++ b/src/position.h
@@ -379,7 +379,7 @@ inline bool Position::is_chess960() const {
 inline bool Position::capture_or_promotion(Move m) const {
 
   assert(is_ok(m));
-  return type_of(m) ? type_of(m) != CASTLING : !empty(to_sq(m));
+  return type_of(m) != NORMAL ? type_of(m) != CASTLING : !empty(to_sq(m));
 }
 
 inline bool Position::capture(Move m) const {