- The `MOVES` list is declared as a class attribute since it does not change and is shared among all instances.
- The `board_size` is passed to the constructor, and `board` is initialized as an instance attribute.
- The `get_valid_moves` method now uses instance variables instead of relying on class variables.
- `solve_knight_tour` and `find_knight_tour` methods now directly access `self.board_size` and `self.board`.