refactor: compute pieces by color separately

1 files changed, 11 insertions, 3 deletions

diff --git a/src/board.rs b/src/board.rs
index 55086bf..a078fff 100644
--- a/src/board.rs
+++ b/src/board.rs
@@ -100,13 +100,21 @@ impl Board {
         !self.occupancy
     }
 
-    fn color_occupancy(&self, color: Color) -> Bitboard {
-        let mut occupancy = 0;
+    fn pieces_by_color(&self, color: Color) -> [Bitboard; 6] {
+        let mut pieces = [0; 6];
         for (piece_type, piece) in self.pieces.iter().enumerate() {
             if piece_type % 2 == color as usize {
-                occupancy |= piece;
+                pieces[piece_type / 2] = *piece;
             }
         }
+        pieces
+    }
+
+    fn color_occupancy(&self, color: Color) -> Bitboard {
+        let mut occupancy = 0;
+        for piece in self.pieces_by_color(color) {
+            occupancy |= piece;
+        }
         occupancy
     }