Snippet of chess

  # Piece superclass possible moves:
  def possible_moves(deltas, allowed_steps, board)
    possible_moves = []
    deltas.each do |delta|
      current_position = @position
      allowed_steps.times do
        move = [delta, current_position].transpose.map {|x| x.reduce(:+)}
        break unless board.move_on_board?(move)
        possible_moves << move if board.piece_at(move).nil?
        if !board.piece_at(move).nil?
          possible_moves << move if board.piece_at(move).color != self.color
          break
        end
        current_position = move
      end
    end
    possible_moves
  end
  
  ### For example our Rook Piece subclass inherits this function like so:  def possible_moves(board)
  def possible_moves(board)
    deltas = [[-1,0], [0,-1], [1,0], [0,1]]
    super(deltas, 8, board)
  end