diff --git a/board/src/check.rs b/board/src/check.rs
new file mode 100644
index 0000000..92fa168
--- /dev/null
+++ b/board/src/check.rs
@@ -0,0 +1,49 @@
+// Eryn Wells <eryn@erynwells.me>
+
+use crate::Board;
+use chessfriend_bitboard::BitBoard;
+use chessfriend_core::{Color, Piece};
+
+impl Board {
+    #[must_use]
+    pub fn active_color_is_in_check(&self) -> bool {
+        self.color_is_in_check(self.active_color)
+    }
+
+    #[must_use]
+    pub fn color_is_in_check(&self, color: Color) -> bool {
+        let king = self.king_bitboard(color);
+        let opposing_sight = self.opposing_sight(color);
+        (king & opposing_sight).is_populated()
+    }
+
+    fn king_bitboard(&self, color: Color) -> BitBoard {
+        self.pieces.find_pieces(Piece::king(color))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::test_board;
+    use chessfriend_core::Color;
+
+    #[test]
+    fn active_color_is_in_check() {
+        let board = test_board!(
+            White King on A3,
+            Black Rook on F3,
+        );
+
+        assert!(board.color_is_in_check(Color::White));
+    }
+
+    #[test]
+    fn active_color_is_not_in_check() {
+        let board = test_board!(
+            White King on A3,
+            Black Rook on B4,
+        );
+
+        assert!(!board.color_is_in_check(Color::White));
+    }
+}
diff --git a/board/src/lib.rs b/board/src/lib.rs
index 3a347d4..1df6832 100644
--- a/board/src/lib.rs
+++ b/board/src/lib.rs
@@ -9,6 +9,7 @@ pub mod macros;
 pub mod movement;
 pub mod sight;
 
+mod check;
 mod piece_sets;
 
 pub use board::Board;
diff --git a/position/src/position/position.rs b/position/src/position/position.rs
index 0eedb0d..c3d5793 100644
--- a/position/src/position/position.rs
+++ b/position/src/position/position.rs
@@ -122,23 +122,6 @@ impl Position {
         self.moves().moves_for_piece(piece)
     }
 
-    #[cfg(test)]
-    pub(crate) fn is_king_in_check(&self) -> bool {
-        let danger_squares = self.king_danger(self.player_to_move());
-        !(danger_squares & self.king_bitboard(self.player_to_move())).is_empty()
-    }
-
-    fn king_bitboard(&self, player: Color) -> BitBoard {
-        self.board.pieces.bitboard_for_piece(Piece::king(player))
-    }
-
-    pub(crate) fn king_square(&self, player: Color) -> Square {
-        self.king_bitboard(player)
-            .occupied_squares(&IterationDirection::default())
-            .next()
-            .unwrap()
-    }
-
     pub(crate) fn checking_pieces(&self) -> CheckingPieces {
         let opponent = self.player_to_move().other();
         let king_square = self.king_square(self.player_to_move());