diff --git a/board/Cargo.toml b/board/Cargo.toml
index 6b600a9..da7df3c 100644
--- a/board/Cargo.toml
+++ b/board/Cargo.toml
@@ -6,3 +6,4 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+chess_core = { path = "../chess_core" }
diff --git a/board/src/fen.rs b/board/src/fen.rs
index b212c94..be63610 100644
--- a/board/src/fen.rs
+++ b/board/src/fen.rs
@@ -3,8 +3,9 @@
 use crate::{
     piece::{Piece, PlacedPiece},
     r#move::Castle,
-    Color, File, Position, Rank, Square,
+    Color, Position,
 };
+use chess_core::{File, Rank, Square};
 use std::fmt::Write;
 
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
@@ -42,7 +43,7 @@ impl ToFen for Position {
                 write!(fen_string, "{}", empty_squares).map_err(|err| FenError::FmtError(err))?;
                 empty_squares = 0;
             }
-            if rank != &Rank::One {
+            if rank != &Rank::ONE {
                 write!(fen_string, "/").map_err(|err| FenError::FmtError(err))?;
             }
         }
diff --git a/board/src/lib.rs b/board/src/lib.rs
index 8c68fad..670368f 100644
--- a/board/src/lib.rs
+++ b/board/src/lib.rs
@@ -16,6 +16,5 @@ mod sight;
 pub use piece::{Color, Piece};
 pub use position::{MoveBuilder as MakeMoveBuilder, Position, PositionBuilder};
 pub use r#move::{Castle, MakeMoveError, Move, MoveBuilder};
-pub use square::{File, Rank, Square};
 
 pub(crate) use bitboard::BitBoard;
diff --git a/board/src/macros.rs b/board/src/macros.rs
index 9dd3323..ad69496 100644
--- a/board/src/macros.rs
+++ b/board/src/macros.rs
@@ -6,7 +6,7 @@ macro_rules! piece {
         $crate::piece::Piece::new($crate::piece::Color::$color, $crate::piece::Shape::$shape)
     };
     ($color:ident $shape:ident on $square:ident) => {
-        $crate::piece::PlacedPiece::new(piece!($color $shape), $crate::square::Square::$square)
+        $crate::piece::PlacedPiece::new(piece!($color $shape), chess_core::Square::$square)
     }
 }
 
diff --git a/board/src/move.rs b/board/src/move.rs
index 08cf988..c593b56 100644
--- a/board/src/move.rs
+++ b/board/src/move.rs
@@ -1,10 +1,7 @@
 // Eryn Wells <eryn@erynwells.me>
 
-use crate::{
-    piece::{Piece, PlacedPiece, Shape},
-    square::Rank,
-    Square,
-};
+use crate::piece::{Piece, PlacedPiece, Shape};
+use chess_core::{Rank, Square};
 use std::fmt;
 
 pub use castle::Castle;
@@ -20,7 +17,8 @@ pub enum MakeMoveError {
 }
 
 mod castle {
-    use crate::{Color, Square};
+    use crate::Color;
+    use chess_core::Square;
 
     #[repr(u16)]
     #[derive(Copy, Clone, Debug, Eq, PartialEq)]
@@ -248,8 +246,8 @@ impl MoveBuilder {
             Shape::Pawn => {
                 let from_rank = from.rank();
                 let to_rank = to.rank();
-                let is_white_double_push = from_rank == Rank::Two && to_rank == Rank::Four;
-                let is_black_double_push = from_rank == Rank::Seven && to_rank == Rank::Five;
+                let is_white_double_push = from_rank == Rank::TWO && to_rank == Rank::FOUR;
+                let is_black_double_push = from_rank == Rank::SEVEN && to_rank == Rank::FIVE;
                 if is_white_double_push || is_black_double_push {
                     Kind::DoublePush
                 } else {
@@ -421,8 +419,8 @@ mod move_formatter {
                         $crate::piece::Color::$color,
                         $crate::piece::Shape::$shape,
                     ),
-                    $crate::Square::$from_square,
-                    $crate::Square::$to_square,
+                    chess_core::Square::$from_square,
+                    chess_core::Square::$to_square,
                 )
                 .build()
             };
@@ -432,15 +430,15 @@ mod move_formatter {
                         $crate::piece::Color::$color,
                         $crate::piece::Shape::$shape,
                     ),
-                    $crate::Square::$from_square,
-                    $crate::Square::$to_square,
+                    chess_core::Square::$from_square,
+                    chess_core::Square::$to_square,
                 )
                 .capturing($crate::piece::PlacedPiece::new(
                     $crate::piece::Piece::new(
                         $crate::piece::Color::$captured_color,
                         $crate::piece::Shape::$captured_shape,
                     ),
-                    $crate::Square::$to_square,
+                    chess_core::Square::$to_square,
                 ))
                 .build()
             };
diff --git a/board/src/move_generator/bishop.rs b/board/src/move_generator/bishop.rs
index 7b07d54..7bad274 100644
--- a/board/src/move_generator/bishop.rs
+++ b/board/src/move_generator/bishop.rs
@@ -3,9 +3,9 @@
 use super::{move_generator_declaration, MoveGeneratorInternal, MoveSet};
 use crate::{
     piece::{Color, Piece, PlacedPiece},
-    square::Direction,
     BitBoard, MoveBuilder, Position,
 };
+use chess_core::Direction;
 
 move_generator_declaration!(ClassicalMoveGenerator);
 
diff --git a/board/src/move_generator/queen.rs b/board/src/move_generator/queen.rs
index 6694bf6..10ad498 100644
--- a/board/src/move_generator/queen.rs
+++ b/board/src/move_generator/queen.rs
@@ -3,9 +3,9 @@
 use super::{move_generator_declaration, MoveGeneratorInternal, MoveSet};
 use crate::{
     piece::{Color, Piece, PlacedPiece},
-    square::Direction,
     BitBoard, MoveBuilder, Position,
 };
+use chess_core::Direction;
 
 move_generator_declaration!(ClassicalMoveGenerator);
 
diff --git a/board/src/move_generator/rook.rs b/board/src/move_generator/rook.rs
index bd48711..8ee6acd 100644
--- a/board/src/move_generator/rook.rs
+++ b/board/src/move_generator/rook.rs
@@ -3,9 +3,9 @@
 use super::{move_generator_declaration, MoveGeneratorInternal, MoveSet};
 use crate::{
     piece::{Color, Piece, PlacedPiece},
-    square::Direction,
     BitBoard, MoveBuilder, Position,
 };
+use chess_core::Direction;
 
 move_generator_declaration!(ClassicalMoveGenerator);
 
@@ -62,9 +62,8 @@ impl<'pos> MoveGeneratorInternal for ClassicalMoveGenerator<'pos> {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::{
-        piece::Piece, position, position::DiagramFormatter, BitBoard, Color, Position, Square,
-    };
+    use crate::{piece::Piece, position, position::DiagramFormatter, BitBoard, Color, Position};
+    use chess_core::Square;
 
     #[test]
     fn classical_single_rook_bitboard() {
diff --git a/board/src/piece.rs b/board/src/piece.rs
index f65a7b8..cc91765 100644
--- a/board/src/piece.rs
+++ b/board/src/piece.rs
@@ -1,9 +1,7 @@
 // Eryn Wells <eryn@erynwells.me>
 
-use crate::{
-    display::{ASCIIDisplay, FENDisplay, UnicodeDisplay},
-    Square,
-};
+use crate::display::{ASCIIDisplay, FENDisplay, UnicodeDisplay};
+use chess_core::Square;
 use std::fmt;
 use std::slice::Iter;
 
diff --git a/board/src/position/builders/move_builder.rs b/board/src/position/builders/move_builder.rs
index 5d12b19..2146e9d 100644
--- a/board/src/position/builders/move_builder.rs
+++ b/board/src/position/builders/move_builder.rs
@@ -4,9 +4,9 @@ use crate::{
     piece::{PlacedPiece, Shape},
     position::flags::Flags,
     r#move::Castle,
-    square::Direction,
-    BitBoard, Color, MakeMoveError, Move, Piece, Position, Square,
+    BitBoard, Color, MakeMoveError, Move, Piece, Position,
 };
+use chess_core::{Direction, Square};
 
 /// A position builder that builds a new position by making a move.
 #[derive(Clone)]
diff --git a/board/src/position/builders/position_builder.rs b/board/src/position/builders/position_builder.rs
index 7c68413..0410ca3 100644
--- a/board/src/position/builders/position_builder.rs
+++ b/board/src/position/builders/position_builder.rs
@@ -5,9 +5,9 @@ use crate::{
     piece::{PlacedPiece, Shape},
     position::{flags::Flags, piece_sets::PieceBitBoards},
     r#move::Castle,
-    square::{Direction, Rank},
-    BitBoard, Color, MakeMoveError, Move, Piece, Position, Square,
+    BitBoard, Color, MakeMoveError, Move, Piece, Position,
 };
+use chess_core::{Rank, Square};
 use std::collections::BTreeMap;
 
 #[derive(Clone)]
@@ -100,7 +100,7 @@ impl Builder {
             // Pawns cannot be placed on the first (back) rank of their side,
             // and cannot be placed on the final rank without a promotion.
             let rank = piece.square().rank();
-            return rank != Rank::One && rank != Rank::Eight;
+            return rank != Rank::ONE && rank != Rank::EIGHT;
         }
 
         true
diff --git a/board/src/position/diagram_formatter.rs b/board/src/position/diagram_formatter.rs
index b007d20..ff4c3cf 100644
--- a/board/src/position/diagram_formatter.rs
+++ b/board/src/position/diagram_formatter.rs
@@ -1,6 +1,7 @@
 // Eryn Wells <eryn@erynwells.me>
 
-use crate::{File, Position, Rank, Square};
+use crate::Position;
+use chess_core::{File, Rank, Square};
 use std::fmt;
 
 pub struct DiagramFormatter<'a>(&'a Position);
diff --git a/board/src/position/piece_sets.rs b/board/src/position/piece_sets.rs
index 58921b9..fa08c84 100644
--- a/board/src/position/piece_sets.rs
+++ b/board/src/position/piece_sets.rs
@@ -2,8 +2,9 @@
 
 use crate::{
     piece::{Piece, PlacedPiece},
-    BitBoard, Color, Square,
+    BitBoard, Color,
 };
+use chess_core::Square;
 
 #[derive(Debug, Eq, PartialEq)]
 pub enum PlacePieceStrategy {
diff --git a/board/src/position/pieces.rs b/board/src/position/pieces.rs
index d1cb6c7..4e4495d 100644
--- a/board/src/position/pieces.rs
+++ b/board/src/position/pieces.rs
@@ -3,7 +3,7 @@
 use super::Position;
 use crate::piece::{Color, Piece, PlacedPiece, Shape};
 use crate::BitBoard;
-use crate::Square;
+use chess_core::Square;
 
 pub struct Pieces<'a> {
     color: Color,
@@ -76,7 +76,6 @@ impl<'a> Iterator for Pieces<'a> {
 mod tests {
     use super::*;
     use crate::piece::{Color, Piece, Shape};
-    use crate::Square;
     use crate::{Position, PositionBuilder};
     use std::collections::HashSet;
 
diff --git a/board/src/position/position.rs b/board/src/position/position.rs
index 484293e..ebc2948 100644
--- a/board/src/position/position.rs
+++ b/board/src/position/position.rs
@@ -7,8 +7,9 @@ use crate::{
     position::DiagramFormatter,
     r#move::Castle,
     sight::Sight,
-    BitBoard, Move, Square,
+    BitBoard, Move,
 };
+use chess_core::Square;
 use std::{cell::OnceCell, fmt};
 
 #[derive(Clone, Debug, Eq, PartialEq)]
@@ -266,7 +267,8 @@ impl fmt::Display for Position {
 
 #[cfg(test)]
 mod tests {
-    use crate::{position, Castle, Color, Position, Square};
+    use crate::{position, Castle, Color, Position};
+    use chess_core::Square;
 
     #[test]
     fn piece_on_square() {
diff --git a/board/src/sight.rs b/board/src/sight.rs
index 33bd2d8..7763bac 100644
--- a/board/src/sight.rs
+++ b/board/src/sight.rs
@@ -2,9 +2,9 @@
 
 use crate::{
     piece::{Color, PlacedPiece, Shape},
-    square::Direction,
     BitBoard, Position,
 };
+use chess_core::Direction;
 
 pub(crate) trait Sight {
     fn sight_in_position(&self, position: &Position) -> BitBoard;
@@ -174,7 +174,8 @@ mod tests {
     }
 
     mod pawn {
-        use crate::{sight::Sight, BitBoard, Square};
+        use crate::{sight::Sight, BitBoard};
+        use chess_core::Square;
 
         sight_test!(e4_pawn, piece!(White Pawn on E4), bitboard!(D5, F5));