diff --git a/Cargo.lock b/Cargo.lock
index e49153a..3ebe93a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -121,6 +121,10 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "acbf1af155f9b9ef647e42cdc158db4b64a1b61f743629225fde6f3e0be2a7c7"
 
+[[package]]
+name = "core"
+version = "0.1.0"
+
 [[package]]
 name = "endian-type"
 version = "0.1.2"
diff --git a/Cargo.toml b/Cargo.toml
index d595fa5..cfa9c81 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,6 +2,7 @@
 
 members = [
     "board",
+    "bitboard",
     "core",
     "explorer",
 ]
diff --git a/bitboard/Cargo.toml b/bitboard/Cargo.toml
new file mode 100644
index 0000000..df608b5
--- /dev/null
+++ b/bitboard/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "chessfriend_bitboard"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+chessfriend_core = { path = "../core" }
diff --git a/board/src/bitboard/bit_scanner.rs b/bitboard/src/bit_scanner.rs
similarity index 100%
rename from board/src/bitboard/bit_scanner.rs
rename to bitboard/src/bit_scanner.rs
diff --git a/board/src/bitboard/bitboard.rs b/bitboard/src/bitboard.rs
similarity index 94%
rename from board/src/bitboard/bitboard.rs
rename to bitboard/src/bitboard.rs
index 5c35ca8..6aa0df2 100644
--- a/board/src/bitboard/bitboard.rs
+++ b/bitboard/src/bitboard.rs
@@ -1,13 +1,13 @@
 // Eryn Wells <eryn@erynwells.me>
 
-use super::library::{library, FILES, RANKS};
-use super::LeadingBitScanner;
-use crate::{square::Direction, Square};
+use crate::library::{library, FILES, RANKS};
+use crate::LeadingBitScanner;
+use chessfriend_core::{Direction, Square};
 use std::fmt;
 use std::ops::Not;
 
 #[derive(Clone, Copy, Eq, Hash, PartialEq)]
-pub(crate) struct BitBoard(pub(super) u64);
+pub struct BitBoard(pub(crate) u64);
 
 macro_rules! moves_getter {
     ($getter_name:ident) => {
@@ -71,14 +71,14 @@ impl BitBoard {
 impl BitBoard {
     /// Return an Iterator over the occupied squares, starting from the leading
     /// (most-significant bit) end of the field.
-    pub(crate) fn occupied_squares(&self) -> impl Iterator<Item = Square> {
-        LeadingBitScanner::new(self.0).map(Square::from_index)
+    pub fn occupied_squares(&self) -> impl Iterator<Item = Square> {
+        LeadingBitScanner::new(self.0).map(|idx| unsafe { Square::from_index(idx as u8) })
     }
 
     /// Return an Iterator over the occupied squares, starting from the trailing
     /// (least-significant bit) end of the field.
-    pub(crate) fn occupied_squares_trailing(&self) -> impl Iterator<Item = Square> {
-        LeadingBitScanner::new(self.0).map(Square::from_index)
+    pub fn occupied_squares_trailing(&self) -> impl Iterator<Item = Square> {
+        LeadingBitScanner::new(self.0).map(|idx| unsafe { Square::from_index(idx as u8) })
     }
 }
 
@@ -243,7 +243,8 @@ impl BitBoardBuilder {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::{bitboard, Square};
+    use crate::bitboard;
+    use chessfriend_core::Square;
 
     #[test]
     fn display_and_debug() {
diff --git a/board/src/bitboard/mod.rs b/bitboard/src/lib.rs
similarity index 56%
rename from board/src/bitboard/mod.rs
rename to bitboard/src/lib.rs
index c417abd..30a35f2 100644
--- a/board/src/bitboard/mod.rs
+++ b/bitboard/src/lib.rs
@@ -1,16 +1,19 @@
+// Eryn Wells <eryn@erynwells.me>
+
 mod bit_scanner;
 mod bitboard;
 mod library;
 mod shifts;
 
+pub use bitboard::{BitBoard, BitBoardBuilder};
+
 pub(crate) use bit_scanner::{LeadingBitScanner, TrailingBitScanner};
-pub(crate) use bitboard::{BitBoard, BitBoardBuilder};
 
 #[macro_export]
 macro_rules! bitboard {
     ($($sq:ident),* $(,)?) => {
-        $crate::bitboard::BitBoardBuilder::empty()
-            $(.square($crate::Square::$sq))*
+        $crate::BitBoardBuilder::empty()
+            $(.square(chessfriend_core::Square::$sq))*
             .build()
     };
 }
diff --git a/board/src/bitboard/library.rs b/bitboard/src/library.rs
similarity index 98%
rename from board/src/bitboard/library.rs
rename to bitboard/src/library.rs
index fe2daa0..6c59291 100644
--- a/board/src/bitboard/library.rs
+++ b/bitboard/src/library.rs
@@ -1,7 +1,7 @@
 // Eryn Wells <eryn@erynwells.me>
 
-use super::BitBoard;
-use crate::{square::Direction, Square};
+use crate::BitBoard;
+use chessfriend_core::{Direction, Square};
 use std::sync::Once;
 
 pub(super) const RANKS: [BitBoard; 8] = [
diff --git a/board/src/bitboard/shifts.rs b/bitboard/src/shifts.rs
similarity index 100%
rename from board/src/bitboard/shifts.rs
rename to bitboard/src/shifts.rs
diff --git a/board/Cargo.toml b/board/Cargo.toml
index 6b600a9..70584c2 100644
--- a/board/Cargo.toml
+++ b/board/Cargo.toml
@@ -6,3 +6,5 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+chessfriend_core = { path = "../core" }
+chessfriend_bitboard = { path = "../bitboard" }
diff --git a/board/src/fen.rs b/board/src/fen.rs
index b212c94..8610f00 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 chessfriend_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 3db0753..243686e 100644
--- a/board/src/lib.rs
+++ b/board/src/lib.rs
@@ -2,8 +2,6 @@
 
 pub mod fen;
 
-#[macro_use]
-mod bitboard;
 mod display;
 mod r#move;
 #[macro_use]
@@ -12,11 +10,7 @@ mod move_generator;
 pub mod piece;
 mod position;
 mod sight;
-mod square;
 
 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..c6c374c 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 $shape), chessfriend_core::Square::$square)
     }
 }
 
diff --git a/board/src/move.rs b/board/src/move.rs
index 08cf988..7b3e55c 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 chessfriend_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 chessfriend_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,
+                    chessfriend_core::Square::$from_square,
+                    chessfriend_core::Square::$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,
+                    chessfriend_core::Square::$from_square,
+                    chessfriend_core::Square::$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,
+                    chessfriend_core::Square::$to_square,
                 ))
                 .build()
             };
diff --git a/board/src/move_generator/bishop.rs b/board/src/move_generator/bishop.rs
index 7b07d54..404d68b 100644
--- a/board/src/move_generator/bishop.rs
+++ b/board/src/move_generator/bishop.rs
@@ -3,9 +3,10 @@
 use super::{move_generator_declaration, MoveGeneratorInternal, MoveSet};
 use crate::{
     piece::{Color, Piece, PlacedPiece},
-    square::Direction,
-    BitBoard, MoveBuilder, Position,
+    MoveBuilder, Position,
 };
+use chessfriend_bitboard::BitBoard;
+use chessfriend_core::Direction;
 
 move_generator_declaration!(ClassicalMoveGenerator);
 
@@ -60,7 +61,8 @@ impl<'pos> MoveGeneratorInternal for ClassicalMoveGenerator<'pos> {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::{piece, piece::Color, position, position::DiagramFormatter, BitBoard};
+    use crate::{piece, piece::Color, position, position::DiagramFormatter};
+    use chessfriend_bitboard::BitBoard;
 
     #[test]
     fn classical_single_bishop_bitboard() {
diff --git a/board/src/move_generator/king.rs b/board/src/move_generator/king.rs
index 06ae76e..643a987 100644
--- a/board/src/move_generator/king.rs
+++ b/board/src/move_generator/king.rs
@@ -7,8 +7,9 @@ use super::{move_generator_declaration, MoveGeneratorInternal, MoveSet};
 use crate::{
     piece::{Color, Piece, PlacedPiece},
     r#move::Castle,
-    BitBoard, Move, MoveBuilder, Position,
+    Move, MoveBuilder, Position,
 };
+use chessfriend_bitboard::BitBoard;
 
 move_generator_declaration!(KingMoveGenerator, struct);
 move_generator_declaration!(KingMoveGenerator, new);
@@ -76,7 +77,8 @@ impl<'pos> MoveGeneratorInternal for KingMoveGenerator<'pos> {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::Square;
+    use chessfriend_bitboard::bitboard;
+    use chessfriend_core::Square;
     use std::collections::HashSet;
 
     #[test]
diff --git a/board/src/move_generator/knight.rs b/board/src/move_generator/knight.rs
index 50a7ad0..64b360f 100644
--- a/board/src/move_generator/knight.rs
+++ b/board/src/move_generator/knight.rs
@@ -3,8 +3,9 @@
 use super::{move_generator_declaration, MoveGeneratorInternal, MoveSet};
 use crate::{
     piece::{Color, Piece, PlacedPiece},
-    BitBoard, MoveBuilder, Position,
+    MoveBuilder, Position,
 };
+use chessfriend_bitboard::BitBoard;
 
 move_generator_declaration!(KnightMoveGenerator);
 
@@ -40,7 +41,8 @@ impl<'pos> MoveGeneratorInternal for KnightMoveGenerator<'pos> {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::{piece, position, Move, Square};
+    use crate::{piece, position, Move};
+    use chessfriend_core::Square;
     use std::collections::HashSet;
 
     #[test]
diff --git a/board/src/move_generator/mod.rs b/board/src/move_generator/mod.rs
index eb080c3..ed5ac74 100644
--- a/board/src/move_generator/mod.rs
+++ b/board/src/move_generator/mod.rs
@@ -14,8 +14,9 @@ pub(crate) use move_set::MoveSet;
 
 use crate::{
     piece::{Color, Piece, PlacedPiece},
-    Move, Position, Square,
+    Move, Position,
 };
+use chessfriend_core::Square;
 use std::collections::BTreeMap;
 
 trait MoveGenerator {
@@ -34,7 +35,10 @@ macro_rules! move_generator_declaration {
         pub(super) struct $name<'pos> {
             position: &'pos $crate::Position,
             color: $crate::piece::Color,
-            move_sets: std::collections::BTreeMap<$crate::Square, $crate::move_generator::MoveSet>,
+            move_sets: std::collections::BTreeMap<
+                chessfriend_core::Square,
+                $crate::move_generator::MoveSet,
+            >,
         }
     };
     ($name:ident, new) => {
@@ -54,12 +58,11 @@ macro_rules! move_generator_declaration {
                 self.move_sets.values().map(|set| set.moves()).flatten()
             }
 
-            fn bitboard(&self) -> $crate::BitBoard {
-                self.move_sets
-                    .values()
-                    .fold($crate::BitBoard::empty(), |partial, mv_set| {
-                        partial | mv_set.bitboard()
-                    })
+            fn bitboard(&self) -> chessfriend_bitboard::BitBoard {
+                self.move_sets.values().fold(
+                    chessfriend_bitboard::BitBoard::empty(),
+                    |partial, mv_set| partial | mv_set.bitboard(),
+                )
             }
         }
     };
diff --git a/board/src/move_generator/move_generator.rs b/board/src/move_generator/move_generator.rs
index 689e47d..2ef4922 100644
--- a/board/src/move_generator/move_generator.rs
+++ b/board/src/move_generator/move_generator.rs
@@ -43,7 +43,8 @@ impl<'a> Moves<'a> {
 
 #[cfg(test)]
 mod tests {
-    use crate::{piece, position, r#move::AlgebraicMoveFormatter, Move, MoveBuilder, Square};
+    use crate::{piece, position, r#move::AlgebraicMoveFormatter, Move, MoveBuilder};
+    use chessfriend_core::Square;
     use std::collections::HashSet;
 
     #[test]
diff --git a/board/src/move_generator/move_set.rs b/board/src/move_generator/move_set.rs
index 1c44766..1c22eac 100644
--- a/board/src/move_generator/move_set.rs
+++ b/board/src/move_generator/move_set.rs
@@ -1,4 +1,5 @@
-use crate::{piece::PlacedPiece, BitBoard, Move};
+use crate::{piece::PlacedPiece, Move};
+use chessfriend_bitboard::BitBoard;
 
 #[derive(Clone, Debug, Eq, PartialEq)]
 struct BitBoardSet {
diff --git a/board/src/move_generator/pawn.rs b/board/src/move_generator/pawn.rs
index 7f77e15..d366405 100644
--- a/board/src/move_generator/pawn.rs
+++ b/board/src/move_generator/pawn.rs
@@ -2,8 +2,9 @@
 
 use crate::{
     piece::{Color, Piece, Shape},
-    BitBoard, Move, MoveBuilder, Position,
+    Move, MoveBuilder, Position,
 };
+use chessfriend_bitboard::BitBoard;
 
 enum MoveList {
     Quiet = 0,
@@ -246,7 +247,8 @@ impl<'pos> Iterator for PawnMoveGenerator<'pos> {
 mod tests {
     use super::*;
     use crate::position::DiagramFormatter;
-    use crate::{piece, Position, Square};
+    use crate::{piece, Position};
+    use chessfriend_core::Square;
     use std::collections::HashSet;
 
     #[test]
diff --git a/board/src/move_generator/queen.rs b/board/src/move_generator/queen.rs
index 6694bf6..fb96dd7 100644
--- a/board/src/move_generator/queen.rs
+++ b/board/src/move_generator/queen.rs
@@ -3,9 +3,10 @@
 use super::{move_generator_declaration, MoveGeneratorInternal, MoveSet};
 use crate::{
     piece::{Color, Piece, PlacedPiece},
-    square::Direction,
-    BitBoard, MoveBuilder, Position,
+    MoveBuilder, Position,
 };
+use chessfriend_bitboard::BitBoard;
+use chessfriend_core::Direction;
 
 move_generator_declaration!(ClassicalMoveGenerator);
 
@@ -66,7 +67,8 @@ impl<'pos> MoveGeneratorInternal for ClassicalMoveGenerator<'pos> {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::{piece, position, position::DiagramFormatter, BitBoard, Color};
+    use crate::{piece, position, position::DiagramFormatter, Color};
+    use chessfriend_bitboard::{bitboard, BitBoard};
 
     #[test]
     fn classical_single_queen_bitboard() {
diff --git a/board/src/move_generator/rook.rs b/board/src/move_generator/rook.rs
index bd48711..570255a 100644
--- a/board/src/move_generator/rook.rs
+++ b/board/src/move_generator/rook.rs
@@ -3,9 +3,10 @@
 use super::{move_generator_declaration, MoveGeneratorInternal, MoveSet};
 use crate::{
     piece::{Color, Piece, PlacedPiece},
-    square::Direction,
-    BitBoard, MoveBuilder, Position,
+    MoveBuilder, Position,
 };
+use chessfriend_bitboard::BitBoard;
+use chessfriend_core::Direction;
 
 move_generator_declaration!(ClassicalMoveGenerator);
 
@@ -62,9 +63,9 @@ 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, Color, Position};
+    use chessfriend_bitboard::{bitboard, BitBoard};
+    use chessfriend_core::Square;
 
     #[test]
     fn classical_single_rook_bitboard() {
diff --git a/board/src/piece.rs b/board/src/piece.rs
index f65a7b8..b80d1da 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 chessfriend_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..4530543 100644
--- a/board/src/position/builders/move_builder.rs
+++ b/board/src/position/builders/move_builder.rs
@@ -4,9 +4,10 @@ use crate::{
     piece::{PlacedPiece, Shape},
     position::flags::Flags,
     r#move::Castle,
-    square::Direction,
-    BitBoard, Color, MakeMoveError, Move, Piece, Position, Square,
+    Color, MakeMoveError, Move, Piece, Position,
 };
+use chessfriend_bitboard::BitBoard;
+use chessfriend_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..88838b7 100644
--- a/board/src/position/builders/position_builder.rs
+++ b/board/src/position/builders/position_builder.rs
@@ -1,13 +1,12 @@
 // Eryn Wells <eryn@erynwells.me>
 
 use crate::{
-    bitboard::BitBoardBuilder,
     piece::{PlacedPiece, Shape},
     position::{flags::Flags, piece_sets::PieceBitBoards},
     r#move::Castle,
-    square::{Direction, Rank},
-    BitBoard, Color, MakeMoveError, Move, Piece, Position, Square,
+    Color, MakeMoveError, Move, Piece, Position,
 };
+use chessfriend_core::{Rank, Square};
 use std::collections::BTreeMap;
 
 #[derive(Clone)]
@@ -100,7 +99,7 @@ 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
@@ -109,8 +108,8 @@ impl Builder {
 
 impl Default for Builder {
     fn default() -> Self {
-        let white_king_square = Square::king_starting_square(Color::White);
-        let black_king_square = Square::king_starting_square(Color::Black);
+        let white_king_square = Square::E1;
+        let black_king_square = Square::E8;
 
         let pieces = BTreeMap::from_iter([
             (white_king_square, piece!(White King)),
diff --git a/board/src/position/diagram_formatter.rs b/board/src/position/diagram_formatter.rs
index b007d20..0c46de4 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 chessfriend_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..d07eb2a 100644
--- a/board/src/position/piece_sets.rs
+++ b/board/src/position/piece_sets.rs
@@ -2,8 +2,10 @@
 
 use crate::{
     piece::{Piece, PlacedPiece},
-    BitBoard, Color, Square,
+    Color,
 };
+use chessfriend_bitboard::BitBoard;
+use chessfriend_core::Square;
 
 #[derive(Debug, Eq, PartialEq)]
 pub enum PlacePieceStrategy {
@@ -124,7 +126,7 @@ impl PieceBitBoards {
 
 impl FromIterator<PlacedPiece> for PieceBitBoards {
     fn from_iter<T: IntoIterator<Item = PlacedPiece>>(iter: T) -> Self {
-        let mut pieces = Self::default();
+        let mut pieces: Self = Default::default();
 
         for piece in iter {
             let _ = pieces.place_piece(&piece);
diff --git a/board/src/position/pieces.rs b/board/src/position/pieces.rs
index d1cb6c7..8530869 100644
--- a/board/src/position/pieces.rs
+++ b/board/src/position/pieces.rs
@@ -2,8 +2,8 @@
 
 use super::Position;
 use crate::piece::{Color, Piece, PlacedPiece, Shape};
-use crate::BitBoard;
-use crate::Square;
+use chessfriend_bitboard::BitBoard;
+use chessfriend_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..82ef1bd 100644
--- a/board/src/position/position.rs
+++ b/board/src/position/position.rs
@@ -7,8 +7,10 @@ use crate::{
     position::DiagramFormatter,
     r#move::Castle,
     sight::Sight,
-    BitBoard, Move, Square,
+    Move,
 };
+use chessfriend_bitboard::BitBoard;
+use chessfriend_core::Square;
 use std::{cell::OnceCell, fmt};
 
 #[derive(Clone, Debug, Eq, PartialEq)]
@@ -266,7 +268,8 @@ impl fmt::Display for Position {
 
 #[cfg(test)]
 mod tests {
-    use crate::{position, Castle, Color, Position, Square};
+    use crate::{position, Castle, Color, Position};
+    use chessfriend_core::Square;
 
     #[test]
     fn piece_on_square() {
diff --git a/board/src/sight.rs b/board/src/sight.rs
index 33bd2d8..ffed3f7 100644
--- a/board/src/sight.rs
+++ b/board/src/sight.rs
@@ -2,9 +2,10 @@
 
 use crate::{
     piece::{Color, PlacedPiece, Shape},
-    square::Direction,
-    BitBoard, Position,
+    Position,
 };
+use chessfriend_bitboard::BitBoard;
+use chessfriend_core::Direction;
 
 pub(crate) trait Sight {
     fn sight_in_position(&self, position: &Position) -> BitBoard;
@@ -174,7 +175,9 @@ mod tests {
     }
 
     mod pawn {
-        use crate::{sight::Sight, BitBoard, Square};
+        use crate::sight::Sight;
+        use chessfriend_bitboard::{bitboard, BitBoard};
+        use chessfriend_core::Square;
 
         sight_test!(e4_pawn, piece!(White Pawn on E4), bitboard!(D5, F5));
 
@@ -233,6 +236,7 @@ mod tests {
     #[macro_use]
     mod knight {
         use crate::sight::Sight;
+        use chessfriend_bitboard::bitboard;
 
         sight_test!(
             f6_knight,
@@ -243,6 +247,7 @@ mod tests {
 
     mod bishop {
         use crate::sight::Sight;
+        use chessfriend_bitboard::bitboard;
 
         sight_test!(
             c2_bishop,
@@ -253,6 +258,7 @@ mod tests {
 
     mod rook {
         use crate::sight::Sight;
+        use chessfriend_bitboard::bitboard;
 
         sight_test!(
             g3_rook,
diff --git a/board/src/square.rs b/board/src/square.rs
deleted file mode 100644
index 23565cf..0000000
--- a/board/src/square.rs
+++ /dev/null
@@ -1,360 +0,0 @@
-// Eryn Wells <eryn@erynwells.me>
-
-use crate::Color;
-use std::{fmt, str::FromStr};
-
-pub enum Direction {
-    North,
-    NorthWest,
-    West,
-    SouthWest,
-    South,
-    SouthEast,
-    East,
-    NorthEast,
-}
-
-#[derive(Debug)]
-pub struct ParseFileError;
-
-#[derive(Debug)]
-pub struct ParseSquareError;
-
-#[derive(Debug)]
-pub struct SquareOutOfBoundsError;
-
-macro_rules! coordinate_enum {
-    ($name: ident, $($variant:ident),*) => {
-        #[repr(u8)]
-        #[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
-        pub enum $name {
-            $($variant), *
-        }
-
-        impl $name {
-            pub const NUM: usize = [$(Self::$variant), *].len();
-            pub const ALL: [Self; Self::NUM] = [$(Self::$variant), *];
-
-            #[inline]
-            pub(crate) fn from_index(index: usize) -> Self {
-                assert!(
-                    index < Self::NUM,
-                    "Index {} out of bounds for {}.",
-                    index,
-                    stringify!($name)
-                );
-                Self::try_index(index).unwrap()
-            }
-
-            pub fn try_index(index: usize) -> Option<Self> {
-                $(
-                    #[allow(non_upper_case_globals)]
-                    const $variant: usize = $name::$variant as usize;
-                )*
-
-                #[allow(non_upper_case_globals)]
-                match index {
-                    $($variant => Some($name::$variant),)*
-                    _ => None,
-                }
-            }
-        }
-    }
-}
-
-#[rustfmt::skip]
-coordinate_enum!(Rank,
-    One, Two, Three, Four, Five, Six, Seven, Eight
-);
-
-#[rustfmt::skip]
-coordinate_enum!(File,
-    A, B, C, D, E, F, G, H
-);
-
-#[rustfmt::skip]
-coordinate_enum!(Square,
-    A1, B1, C1, D1, E1, F1, G1, H1,
-    A2, B2, C2, D2, E2, F2, G2, H2,
-    A3, B3, C3, D3, E3, F3, G3, H3,
-    A4, B4, C4, D4, E4, F4, G4, H4,
-    A5, B5, C5, D5, E5, F5, G5, H5,
-    A6, B6, C6, D6, E6, F6, G6, H6,
-    A7, B7, C7, D7, E7, F7, G7, H7,
-    A8, B8, C8, D8, E8, F8, G8, H8
-);
-
-impl Into<char> for File {
-    fn into(self) -> char {
-        ('a' as u8 + self as u8) as char
-    }
-}
-
-impl TryFrom<char> for File {
-    type Error = ParseFileError;
-
-    fn try_from(value: char) -> Result<Self, Self::Error> {
-        let lowercase_value = value.to_ascii_lowercase();
-        for file in File::ALL.iter() {
-            if lowercase_value == (*file).into() {
-                return Ok(*file);
-            }
-        }
-
-        Err(ParseFileError)
-    }
-}
-
-impl fmt::Display for File {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "{}", Into::<char>::into(*self).to_uppercase())
-    }
-}
-
-impl Into<char> for Rank {
-    fn into(self) -> char {
-        ('1' as u8 + self as u8) as char
-    }
-}
-
-impl TryFrom<char> for Rank {
-    type Error = ParseFileError;
-
-    fn try_from(value: char) -> Result<Self, Self::Error> {
-        let lowercase_value = value.to_ascii_lowercase();
-        for rank in Self::ALL.iter().cloned() {
-            if lowercase_value == rank.into() {
-                return Ok(rank);
-            }
-        }
-
-        Err(ParseFileError)
-    }
-}
-
-impl fmt::Display for Rank {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "{}", Into::<char>::into(*self))
-    }
-}
-
-impl Square {
-    #[inline]
-    pub fn from_file_rank(file: File, rank: Rank) -> Square {
-        Self::from_index((rank as usize) << 3 | file as usize)
-    }
-
-    #[inline]
-    pub fn file(self) -> File {
-        File::from_index(self as usize & 0b000111)
-    }
-
-    #[inline]
-    pub fn rank(self) -> Rank {
-        Rank::from_index(self as usize >> 3)
-    }
-}
-
-impl Square {
-    const KING_STARTING_SQUARES: [Square; 2] = [Square::E1, Square::E8];
-
-    pub fn king_starting_square(color: Color) -> Square {
-        Square::KING_STARTING_SQUARES[color as usize]
-    }
-
-    pub fn from_algebraic_str(s: &str) -> Result<Square, ParseSquareError> {
-        s.parse()
-    }
-
-    pub fn neighbor(self, direction: Direction) -> Option<Square> {
-        match direction {
-            Direction::North => Square::try_index(self as usize + 8),
-            Direction::NorthWest => {
-                if self.rank() != Rank::Eight {
-                    Square::try_index(self as usize + 7)
-                } else {
-                    None
-                }
-            }
-            Direction::West => {
-                if self.file() != File::A {
-                    Square::try_index(self as usize - 1)
-                } else {
-                    None
-                }
-            }
-            Direction::SouthWest => {
-                if self.rank() != Rank::One {
-                    Square::try_index(self as usize - 9)
-                } else {
-                    None
-                }
-            }
-            Direction::South => {
-                if self.rank() != Rank::One {
-                    Square::try_index(self as usize - 8)
-                } else {
-                    None
-                }
-            }
-            Direction::SouthEast => {
-                if self.rank() != Rank::One {
-                    Square::try_index(self as usize - 7)
-                } else {
-                    None
-                }
-            }
-            Direction::East => {
-                if self.file() != File::H {
-                    Square::try_index(self as usize + 1)
-                } else {
-                    None
-                }
-            }
-            Direction::NorthEast => Square::try_index(self as usize + 9),
-        }
-    }
-}
-
-impl FromStr for Square {
-    type Err = ParseSquareError;
-
-    fn from_str(s: &str) -> Result<Self, Self::Err> {
-        let mut chars = s.chars();
-
-        let file: File = chars
-            .next()
-            .and_then(|c| c.try_into().ok())
-            .ok_or(ParseSquareError)?;
-
-        let rank: Rank = chars
-            .next()
-            .and_then(|c| c.try_into().ok())
-            .ok_or(ParseSquareError)?;
-
-        if !chars.next().is_none() {
-            return Err(ParseSquareError);
-        }
-
-        Ok(Square::from_file_rank(file, rank))
-    }
-}
-
-macro_rules! try_from_integer {
-    ($int_type:ident) => {
-        impl TryFrom<$int_type> for Square {
-            type Error = SquareOutOfBoundsError;
-
-            fn try_from(value: $int_type) -> Result<Self, Self::Error> {
-                Square::try_index(value as usize).ok_or(SquareOutOfBoundsError)
-            }
-        }
-    };
-}
-
-try_from_integer!(u8);
-try_from_integer!(u16);
-try_from_integer!(u32);
-try_from_integer!(u64);
-
-impl fmt::Display for Square {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(
-            f,
-            "{}{}",
-            ('a' as u8 + self.file() as u8) as char,
-            self.rank() as usize + 1
-        )
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn good_algebraic_input() {
-        let sq = Square::from_algebraic_str("a4").expect("Failed to parse 'a4' square");
-        assert_eq!(sq.file(), File::A);
-        assert_eq!(sq.rank(), Rank::Four);
-
-        let sq = Square::from_algebraic_str("B8").expect("Failed to parse 'B8' square");
-        assert_eq!(sq.file(), File::B);
-        assert_eq!(sq.rank(), Rank::Eight);
-
-        let sq = Square::from_algebraic_str("e4").expect("Failed to parse 'B8' square");
-        assert_eq!(sq.file(), File::E);
-        assert_eq!(sq.rank(), Rank::Four);
-    }
-
-    #[test]
-    fn bad_algebraic_input() {
-        Square::from_algebraic_str("a0").expect_err("Got valid Square for 'a0'");
-        Square::from_algebraic_str("j3").expect_err("Got valid Square for 'j3'");
-        Square::from_algebraic_str("a11").expect_err("Got valid Square for 'a11'");
-        Square::from_algebraic_str("b-1").expect_err("Got valid Square for 'b-1'");
-        Square::from_algebraic_str("a 1").expect_err("Got valid Square for 'a 1'");
-        Square::from_algebraic_str("").expect_err("Got valid Square for ''");
-    }
-
-    #[test]
-    fn from_index() {
-        let sq = Square::try_index(4).expect("Unable to get Square from index");
-        assert_eq!(sq.file(), File::E);
-        assert_eq!(sq.rank(), Rank::One);
-
-        let sq = Square::try_index(28).expect("Unable to get Square from index");
-        assert_eq!(sq.file(), File::E);
-        assert_eq!(sq.rank(), Rank::Four);
-    }
-
-    #[test]
-    fn to_index() {
-        assert_eq!(Square::A1 as usize, 0);
-        assert_eq!(Square::H8 as usize, 63);
-    }
-
-    #[test]
-    fn valid_neighbors() {
-        let sq = Square::E4;
-
-        assert_eq!(sq.neighbor(Direction::North), Some(Square::E5));
-        assert_eq!(sq.neighbor(Direction::NorthEast), Some(Square::F5));
-        assert_eq!(sq.neighbor(Direction::East), Some(Square::F4));
-        assert_eq!(sq.neighbor(Direction::SouthEast), Some(Square::F3));
-        assert_eq!(sq.neighbor(Direction::South), Some(Square::E3));
-        assert_eq!(sq.neighbor(Direction::SouthWest), Some(Square::D3));
-        assert_eq!(sq.neighbor(Direction::West), Some(Square::D4));
-        assert_eq!(sq.neighbor(Direction::NorthWest), Some(Square::D5));
-    }
-
-    #[test]
-    fn invalid_neighbors() {
-        let sq = Square::A1;
-        assert!(sq.neighbor(Direction::West).is_none());
-        assert!(sq.neighbor(Direction::SouthWest).is_none());
-        assert!(sq.neighbor(Direction::South).is_none());
-
-        let sq = Square::H1;
-        assert!(sq.neighbor(Direction::East).is_none());
-        assert!(sq.neighbor(Direction::SouthEast).is_none());
-        assert!(sq.neighbor(Direction::South).is_none());
-
-        let sq = Square::A8;
-        assert!(sq.neighbor(Direction::North).is_none());
-        assert!(sq.neighbor(Direction::NorthWest).is_none());
-        assert!(sq.neighbor(Direction::West).is_none());
-
-        let sq = Square::H8;
-        assert!(sq.neighbor(Direction::North).is_none());
-        assert!(sq.neighbor(Direction::NorthEast).is_none());
-        assert!(sq.neighbor(Direction::East).is_none());
-    }
-
-    #[test]
-    fn display() {
-        assert_eq!(format!("{}", Square::C5), "c5");
-        assert_eq!(format!("{}", Square::A1), "a1");
-        assert_eq!(format!("{}", Square::H8), "h8");
-    }
-}
diff --git a/core/Cargo.toml b/core/Cargo.toml
index 900733d..9b33128 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -1,5 +1,5 @@
 [package]
-name = "core"
+name = "chessfriend_core"
 version = "0.1.0"
 edition = "2021"
 
diff --git a/explorer/Cargo.toml b/explorer/Cargo.toml
index 5d49281..3f2513b 100644
--- a/explorer/Cargo.toml
+++ b/explorer/Cargo.toml
@@ -6,6 +6,7 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+chessfriend_core = { path = "../core" }
 board = { path = "../board" }
 clap = { version = "4.4.12", features = ["derive"] }
 rustyline = "13.0.0"
diff --git a/explorer/src/main.rs b/explorer/src/main.rs
index 9da6a64..e8fca2f 100644
--- a/explorer/src/main.rs
+++ b/explorer/src/main.rs
@@ -1,5 +1,6 @@
 use board::piece::{Color, Piece, Shape};
-use board::{Position, Square};
+use board::Position;
+use chessfriend_core::Square;
 use clap::{Arg, Command};
 use rustyline::error::ReadlineError;
 use rustyline::DefaultEditor;