fix shift

src/repr/board.rs

@@ -271,9 +271,8 @@ impl Board {
     /// DO NOT USE THIS ALONE, this should be called as a part of
     /// [`Board::place`] or [`Board::place_and_prop_unchecked`]
     fn propegate_from_dry(&self, coords: CoordPair, starting_color: Piece) -> BitBoard {
-        let opponent_color = starting_color.flip();
         let player_board = *self.board(starting_color);
-        let opponent_board = *self.board(opponent_color);
+        let opponent_board = *self.board(starting_color.flip());
 
         let mut flip_mask = BitBoard::new();
         let seed = BitBoard::from_coord(coords);
@@ -300,12 +299,12 @@ impl Board {
                 if current.count() == 0 || !current.intersects(opponent_board) {
                     break;
                 }
-                temp_flips = temp_flips.union(current);
+                temp_flips |= current;
             }
 
             // If terminated on a player piece, keep the flips
             if current.intersects(player_board) {
-                flip_mask = flip_mask.union(temp_flips);
+                flip_mask |= temp_flips;
             }
         }