diff --git a/src/repr.rs b/src/repr.rs
index 985d770..731fb9e 100644
--- a/src/repr.rs
+++ b/src/repr.rs
@@ -23,6 +23,14 @@ impl Piece {
     }
 }
 
+impl std::ops::Not for Piece {
+    type Output = Piece;
+
+    fn not(self) -> Self::Output {
+        self.flip()
+    }
+}
+
 const BOARD_SIZE: usize = 8;
 
 #[derive(Copy, Clone)]