diff --git a/src/chess/bitboard.rs b/src/chess/bitboard.rs
index 5d66b2d..d3ba633 100644
--- a/src/chess/bitboard.rs
+++ b/src/chess/bitboard.rs
@@ -164,6 +164,8 @@ impl Bitboard {
     }
 
     #[inline(always)]
+    #[allow(clippy::allow_attributes, reason = "Only used in non-release mode")]
+    #[allow(unused, reason = "Only used in non-release mode")]
     pub fn flip_vertically(self) -> Self {
         Self(u64::swap_bytes(self.0))
     }
diff --git a/src/chess/board.rs b/src/chess/board.rs
index d44bfb9..40e1254 100644
--- a/src/chess/board.rs
+++ b/src/chess/board.rs
@@ -128,6 +128,8 @@ impl Board {
         enemy_attackers.any()
     }
 
+    #[allow(clippy::allow_attributes, reason = "Only used in non-release mode")]
+    #[allow(unused, reason = "Only used in non-release mode")]
     pub fn flip_vertically(&self) -> Self {
         let [white_colors, black_colors] = self.colors.inner();
         let [pawns, knights, bishops, rooks, queens, king] = self.pieces;
diff --git a/src/chess/square.rs b/src/chess/square.rs
index 1339e89..b72f0c7 100644
--- a/src/chess/square.rs
+++ b/src/chess/square.rs
@@ -61,7 +61,7 @@ impl File {
         }
     }
 
-    pub fn bitboard(&self) -> Bitboard {
+    pub fn bitboard(self) -> Bitboard {
         match self {
             Self::A => bitboards::A_FILE,
             Self::B => bitboards::B_FILE,