A pawn has a unique movement too in that it moves forward, but it captures diagonally. Let's similarly override the moves_available class from within the Pawn class, as follows (see 4.04—piece.py):
class Pawn(Piece): def moves_available(self, current_position): model = self.model piece = self if self.color == 'white': initial_position, direction, enemy = 1, 1, 'black' else: initial_position, direction, enemy = 6, -1, 'white' allowed_moves = [] # Moving prohibited = model.all_occupied_positions() start_position = get_numeric_notation(current_position.upper()) forward = start_position[0] + direction, start_position[1] if model.get_alphanumeric_position(forward) not in prohibited: allowed_moves.append(forward) if start_position[0] ...
