class Piece:
    def __init__(self, name, color):
        self.name = name
        self.color = color
        self.valid_moves = []
        self.moved = False
        if color == 'white':
            self.pawn_direction = -1
        else:
            self.pawn_direction = 1
    def add_moves(self, move):
        self.valid_moves.append(move)
    def delete_moves(self):
        self.valid_moves = []