tune: only push history for real moves

src/lib.rs

@@ -628,6 +628,11 @@ impl Board {
         Board::from_fen(START_POSITION).unwrap()
     }
 
+    /// Save the current position's hash in the history.
+    pub fn push_history(&mut self) {
+        self.history.push(self.zobrist);
+    }
+
     /// Get iterator over all squares.
     pub fn squares() -> impl Iterator<Item = Square> {
         (0..N_SQUARES).map(Square::try_from).map(|x| x.unwrap())

src/main.rs

@@ -64,6 +64,7 @@ fn cmd_position_moves(mut tokens: std::str::SplitWhitespace<'_>, mut board: Boar
                 for mv in tokens.by_ref() {
                     let mv = Move::from_uci_algebraic(mv).unwrap();
                     let _ = mv.make(&mut board);
+                    board.push_history();
                 }
             }
             _ => ignore!(),

src/movegen.rs

@@ -98,8 +98,6 @@ pub struct AntiMove {
 impl AntiMove {
     /// Undo the move.
     pub fn unmake(self, pos: &mut Board) {
-        pos.history.pop();
-
         Zobrist::toggle_board_info(pos);
 
         pos.move_piece(self.dest, self.src);
@@ -186,8 +184,6 @@ impl Move {
             ep_square: pos.ep_square,
         };
 
-        pos.history.push(pos.zobrist);
-
         // undo hashes (we will update them at the end of this function)
         Zobrist::toggle_board_info(pos);