Fix assertion for atomic

No functional change.

diff --git a/src/position.cpp b/src/position.cpp
index 065f34e..332aadf 100644 (file)
--- a/src/position.cpp
+++ b/src/position.cpp
@@ -1752,6 +1752,8 @@ void Position::undo_move(Move m) {
                                                                                : ~unpromotedBpc);
           }
       }
+      // Reset piece since it exploded itself
+      pc = piece_on(to);
   }
 
   // Remove gated piece