diff --git a/board/src/moves/move.rs b/board/src/moves/move.rs
index 53f6ecc..ece8f18 100644
--- a/board/src/moves/move.rs
+++ b/board/src/moves/move.rs
@@ -1,7 +1,10 @@
 // Eryn Wells <eryn@erynwells.me>
 
-use crate::piece::{Piece, PlacedPiece, Shape};
-use crate::Square;
+use crate::{
+    piece::{Piece, PlacedPiece, Shape},
+    position::BoardSide,
+    Square,
+};
 
 #[derive(Debug, Clone, Eq, Hash, PartialEq)]
 pub struct Move {
@@ -32,4 +35,27 @@ impl Move {
         self.promoting_to = Some(shape);
         self
     }
+
+    pub fn is_castle(&self) -> bool {
+        let color = self.piece.color();
+        self.piece.shape() == Shape::King
+            && self.from == Square::KING_STARTING_SQUARES[color as usize]
+            && Square::KING_CASTLE_TARGET_SQUARES[color as usize].contains(&self.to)
+    }
+
+    pub fn is_kingside_castle(&self) -> bool {
+        let color = self.piece.color();
+        self.piece.shape() == Shape::King
+            && self.from == Square::KING_STARTING_SQUARES[color as usize]
+            && self.to
+                == Square::KING_CASTLE_TARGET_SQUARES[color as usize][BoardSide::King as usize]
+    }
+
+    pub fn is_queenside_castle(&self) -> bool {
+        let color = self.piece.color();
+        self.piece.shape() == Shape::King
+            && self.from == Square::KING_STARTING_SQUARES[color as usize]
+            && self.to
+                == Square::KING_CASTLE_TARGET_SQUARES[color as usize][BoardSide::Queen as usize]
+    }
 }
diff --git a/board/src/square.rs b/board/src/square.rs
index 7a0d6d8..d380b29 100644
--- a/board/src/square.rs
+++ b/board/src/square.rs
@@ -155,6 +155,10 @@ impl Square {
 }
 
 impl Square {
+    pub(crate) const KING_STARTING_SQUARES: [Square; 2] = [Square::E1, Square::E8];
+    pub(crate) const KING_CASTLE_TARGET_SQUARES: [[Square; 2]; 2] =
+        [[Square::C1, Square::G1], [Square::C8, Square::G8]];
+
     pub fn from_algebraic_str(s: &str) -> Result<Square, ParseSquareError> {
         s.parse()
     }