diff --git a/src/repr/board.rs b/src/repr/board.rs
index 0dcfc1d..673b3b0 100644
--- a/src/repr/board.rs
+++ b/src/repr/board.rs
@@ -286,8 +286,8 @@ impl Board {
         let seed = BitBoard::from_coord(coords);
 
         macro_rules! apply_dir {
-            ($base:expr, $sum_mask:expr, $dir:expr) => {
-                let mut current = $base;
+            ($dir:expr) => {
+                let mut current = seed;
                 let mut temp_flips = BitBoard::new();
 
                 // Expand in direction until edge or non-opponent piece
@@ -303,19 +303,19 @@ impl Board {
 
                 // If terminated on a player piece, keep the flips
                 if current.intersects(*player_board) {
-                    $sum_mask.bitor_assign(temp_flips);
+                    flip_mask.bitor_assign(temp_flips);
                 }
             };
         }
 
-        apply_dir!(seed, flip_mask, BitBoard::east);
-        apply_dir!(seed, flip_mask, BitBoard::west);
-        apply_dir!(seed, flip_mask, BitBoard::north);
-        apply_dir!(seed, flip_mask, BitBoard::south);
-        apply_dir!(seed, flip_mask, BitBoard::northeast);
-        apply_dir!(seed, flip_mask, BitBoard::northwest);
-        apply_dir!(seed, flip_mask, BitBoard::southeast);
-        apply_dir!(seed, flip_mask, BitBoard::southwest);
+        apply_dir!(BitBoard::east);
+        apply_dir!(BitBoard::west);
+        apply_dir!(BitBoard::north);
+        apply_dir!(BitBoard::south);
+        apply_dir!(BitBoard::northeast);
+        apply_dir!(BitBoard::northwest);
+        apply_dir!(BitBoard::southeast);
+        apply_dir!(BitBoard::southwest);
         flip_mask
     }