diff --git a/src/repr/board.rs b/src/repr/board.rs
index a9074aa..f5917c5 100644
--- a/src/repr/board.rs
+++ b/src/repr/board.rs
@@ -1,106 +1,11 @@
 use super::{
     bitboard::BitBoard,
-    misc::get_index,
-    misc::{diag_raw, split_from},
+    chains::{gen_adj_lookup, ChainCollection, PosMap},
     piece::Piece,
 };
-use arrayvec::ArrayVec;
 use const_fn::const_fn;
 use lazy_static::lazy_static;
-use std::{cmp::Ordering, collections::HashSet, fmt};
-
-/// A chain of positions across the board
-type Chain = ArrayVec<(usize, usize), { Board::BOARD_SIZE - 1 }>;
-
-/// A collection of chains (up vert, down vert, left horiz, right horiz, diagonals....)
-type ChainCollection = ArrayVec<Chain, 8>;
-
-/// Map of all points on the board against some type T
-/// Used to index like so: example[i][j]
-/// with each coordinate
-pub struct PosMap<T: Default>(ArrayVec<T, { Board::BOARD_AREA }>);
-
-impl<T: Default> PosMap<T> {
-    #[allow(clippy::new_without_default)]
-    pub fn new() -> Self {
-        Self(ArrayVec::from_iter(
-            (0..Board::BOARD_AREA).map(|_| Default::default()),
-        ))
-    }
-
-    pub fn get(&self, row: usize, col: usize) -> &T {
-        let index = get_index(row, col);
-
-        debug_assert!(
-            Board::BOARD_AREA + 1 >= index,
-            "index out of range, was: {}",
-            index
-        );
-
-        unsafe { self.0.get_unchecked(index) }
-    }
-
-    pub fn set(&mut self, row: usize, col: usize, value: T) {
-        let index = get_index(row, col);
-        debug_assert!(
-            Board::BOARD_AREA + 1 >= index,
-            "index out of range, was: {}",
-            index
-        );
-
-        self.0[index] = value;
-    }
-}
-
-/// Creates a lookup map for adjacencies and chains from each position on the board
-fn gen_adj_lookup() -> PosMap<ChainCollection> {
-    PosMap(
-        Board::all_positions()
-            .map(|(i, j)| {
-                let (i_chain, j_chain) = (
-                    split_from(0..=Board::BOARD_SIZE - 1, i),
-                    split_from(0..=Board::BOARD_SIZE - 1, j),
-                );
-
-                let chains: ChainCollection = ArrayVec::from_iter(
-                    i_chain
-                        .clone()
-                        .into_iter()
-                        .map(|range| range.map(move |i| (i, j)))
-                        .map(Iterator::collect)
-                        .chain(
-                            j_chain
-                                .clone()
-                                .into_iter()
-                                .map(|range| range.map(move |j| (i, j)))
-                                .map(Iterator::collect),
-                        )
-                        .chain(diag_raw(i_chain, j_chain).map(Iterator::collect)),
-                );
-
-                // make sure all chains are in the proper range so we can ignore bounds checking later
-                assert!(
-                    chains
-                        .iter()
-                        .flatten()
-                        .flat_map(|(i, j)| [i, j]) // flatten to just numbers
-                        .all(|x| (0..Board::BOARD_SIZE).contains(x)),
-                    "chains go out-of-bounds"
-                );
-
-                // SAFETY! ensure all nodes in all chains are unique across chains, ensures beavior in
-                // [`Board::propegate_from`]
-                let mut uniq = HashSet::new();
-                assert!(
-                    chains.iter().flatten().all(move |x| uniq.insert(x)),
-                    "there are duplicate nodes in chain"
-                );
-
-                chains
-            })
-            .collect(),
-    )
-}
+use std::{cmp::Ordering, fmt};
 
 #[derive(PartialEq, Eq, Copy, Clone, Debug)]
 pub enum Winner {
diff --git a/src/repr/chains.rs b/src/repr/chains.rs
new file mode 100644
index 0000000..ed67200
--- /dev/null
+++ b/src/repr/chains.rs
@@ -0,0 +1,99 @@
+use super::{
+    misc::{diag_raw, get_index, split_from},
+    Board,
+};
+use arrayvec::ArrayVec;
+use std::collections::HashSet;
+
+/// A chain of positions across the board
+type Chain = ArrayVec<(usize, usize), { Board::BOARD_SIZE - 1 }>;
+
+/// A collection of chains (up vert, down vert, left horiz, right horiz, diagonals....)
+pub type ChainCollection = ArrayVec<Chain, 8>;
+
+/// Map of all points on the board against some type T
+/// Used to index like so: example[i][j]
+/// with each coordinate
+pub struct PosMap<T: Default>(ArrayVec<T, { Board::BOARD_AREA }>);
+
+impl<T: Default> PosMap<T> {
+    #[allow(clippy::new_without_default)]
+    pub fn new() -> Self {
+        Self(ArrayVec::from_iter(
+            (0..Board::BOARD_AREA).map(|_| Default::default()),
+        ))
+    }
+
+    pub fn get(&self, row: usize, col: usize) -> &T {
+        let index = get_index(row, col);
+
+        debug_assert!(
+            Board::BOARD_AREA + 1 >= index,
+            "index out of range, was: {}",
+            index
+        );
+
+        unsafe { self.0.get_unchecked(index) }
+    }
+
+    pub fn set(&mut self, row: usize, col: usize, value: T) {
+        let index = get_index(row, col);
+        debug_assert!(
+            Board::BOARD_AREA + 1 >= index,
+            "index out of range, was: {}",
+            index
+        );
+
+        self.0[index] = value;
+    }
+}
+
+/// Creates a lookup map for adjacencies and chains from each position on the board
+pub fn gen_adj_lookup() -> PosMap<ChainCollection> {
+    PosMap(
+        Board::all_positions()
+            .map(|(i, j)| {
+                let (i_chain, j_chain) = (
+                    split_from(0..=Board::BOARD_SIZE - 1, i),
+                    split_from(0..=Board::BOARD_SIZE - 1, j),
+                );
+
+                let chains: ChainCollection = ArrayVec::from_iter(
+                    i_chain
+                        .clone()
+                        .into_iter()
+                        .map(|range| range.map(move |i| (i, j)))
+                        .map(Iterator::collect)
+                        .chain(
+                            j_chain
+                                .clone()
+                                .into_iter()
+                                .map(|range| range.map(move |j| (i, j)))
+                                .map(Iterator::collect),
+                        )
+                        .chain(diag_raw(i_chain, j_chain).map(Iterator::collect)),
+                );
+
+                // make sure all chains are in the proper range so we can ignore bounds checking later
+                assert!(
+                    chains
+                        .iter()
+                        .flatten()
+                        .flat_map(|(i, j)| [i, j]) // flatten to just numbers
+                        .all(|x| (0..Board::BOARD_SIZE).contains(x)),
+                    "chains go out-of-bounds"
+                );
+
+                // SAFETY! ensure all nodes in all chains are unique across chains, ensures beavior in
+                // [`Board::propegate_from`]
+                let mut uniq = HashSet::new();
+                assert!(
+                    chains.iter().flatten().all(move |x| uniq.insert(x)),
+                    "there are duplicate nodes in chain"
+                );
+
+                chains
+            })
+            .collect(),
+    )
+}
diff --git a/src/repr/mod.rs b/src/repr/mod.rs
index 110720a..377a812 100644
--- a/src/repr/mod.rs
+++ b/src/repr/mod.rs
@@ -1,7 +1,9 @@
 mod bitboard;
 mod board;
+mod chains;
 mod misc;
 mod piece;
 
-pub use board::{Board, PosMap, Winner};
+pub use board::{Board, Winner};
+pub use chains::PosMap;
 pub use piece::Piece;