fix: load fen fix

Author: Kacperacy

src/board/mod.rs

@@ -104,7 +104,7 @@ impl Board {
                 fifty_move_ply_count: 0,
                 current_zobrist: 0,
             },
-            ply: 0,
+            ply: 1,
             moves: Vec::new(),
             zobrist_history: Vec::new(),
             fen_history: Vec::new(),
@@ -180,6 +180,7 @@ impl Board {
             _ => panic!("Invalid FEN"),
         };
 
+        self.game_state.castling_rights = 0;
         if parts[2].contains('K') {
             self.game_state.castling_rights |= CASTLING_WHITE_KING;
         }
@@ -269,13 +270,14 @@ impl Board {
         } + if is_king_side { 0 } else { 1 };
 
         let mask = 1 << index;
-        let king_square = CASTLING_RIGHTS_SQUARES[index][0];
-        let rook_square = CASTLING_ROOKS[index];
 
         if self.game_state.castling_rights & mask == 0 {
             return false;
         }
 
+        let king_square = CASTLING_RIGHTS_SQUARES[index][0];
+        let rook_square = CASTLING_ROOKS[index];
+
         self.is_empty_between(king_square, rook_square)
     }
 

tests/board_tests.rs

@@ -18,8 +18,8 @@ mod tests {
         let mut board = Board::new();
         board.reset();
         assert_eq!(board.turn, Color::White);
-        assert_eq!(board.halfmove_clock, 0);
-        assert_eq!(board.fullmove_number, 1);
+        assert_eq!(board.game_state.fifty_move_ply_count, 0);
+        assert_eq!(board.ply, 0);
         assert!(board
             .pieces
             .iter()
@@ -31,7 +31,7 @@ mod tests {
         let mut board = Board::new();
         board.set_fen("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1");
         assert_eq!(board.turn, Color::White);
-        assert_eq!(board.fullmove_number, 1);
+        assert_eq!(board.ply, 0);
         assert!(board.pieces[Color::White as usize][Piece::Pawn as usize].is_set(8));
         assert!(board.pieces[Color::Black as usize][Piece::Pawn as usize].is_set(48));
     }
@@ -211,12 +211,12 @@ mod tests {
 
         assert_eq!(board.turn, Color::White);
 
-        assert_eq!(board.castling_rights, 0b1111);
+        assert_eq!(board.game_state.castling_rights, 0b1111);
 
-        assert_eq!(board.en_passant_square, None);
+        assert_eq!(board.game_state.en_passant_square, None);
 
-        assert_eq!(board.halfmove_clock, 0);
-        assert_eq!(board.fullmove_number, 1);
+        assert_eq!(board.game_state.fifty_move_ply_count, 0);
+        assert_eq!(board.ply, 0);
     }
 
     #[test]