diff --git a/src/lib.rs b/src/lib.rs
index c097d31..d5394eb 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,4 +1,4 @@
-#[derive(Debug, Clone, Copy)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
 enum Piece {
     Pawn,
     Knight,
@@ -20,7 +20,7 @@ impl Piece {
     }
 }
 
-#[derive(Debug, Clone, Copy)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
 struct LocatedPiece {
     piece: Piece,
     rank: usize,
@@ -30,6 +30,7 @@ struct LocatedPiece {
 struct Board {
     white: Vec<LocatedPiece>,
     black: Vec<LocatedPiece>,
+    white_to_move: bool,
 }
 
 impl Board {
@@ -72,6 +73,7 @@ impl Board {
         Self {
             white: white_pieces.chain(white_pawns).collect(),
             black: black_pieces.chain(black_pawns).collect(),
+            white_to_move: true,
         }
     }
     fn material(&self) -> i32 {
@@ -87,6 +89,54 @@ impl Board {
             .sum::<i32>();
         white_value - black_value
     }
+    fn make_move(&mut self, algebra: &str) {
+        let mover = if self.white_to_move {
+            &mut self.white
+        } else {
+            &mut self.black
+        };
+
+        if algebra == "O-O" || algebra == "0-0" {
+            mover
+                .iter_mut()
+                .find(|lp| lp.piece == Piece::King)
+                .unwrap()
+                .file = 6; //castles kingside
+            mover
+                .iter_mut()
+                .find(|lp| lp.piece == Piece::Rook && lp.file == 7)
+                .unwrap()
+                .file = 5;
+        } else if algebra == "O-O-O" || algebra == "0-0-0" {
+            mover
+                .iter_mut()
+                .find(|lp| lp.piece == Piece::King)
+                .unwrap()
+                .file = 2; //castles queenside
+            mover
+                .iter_mut()
+                .find(|lp| lp.piece == Piece::Rook && lp.file == 0)
+                .unwrap()
+                .file = 3;
+        }
+
+        let first_char = algebra.chars().next().unwrap();
+        let piece = if first_char.is_ascii_uppercase() {
+            match first_char {
+                'R' => Piece::Rook,
+                'N' => Piece::Knight,
+                'B' => Piece::Bishop,
+                'K' => Piece::King,
+                'Q' => Piece::Queen,
+                _ => unreachable!(),
+            }
+        } else {
+            Piece::Pawn
+        };
+
+        let destination_square = todo!();
+        todo!()
+    }
 }
 
 #[cfg(test)]