class Human

  attr_reader :piece
  
  def initialize board, piece
    @board = board
    @piece = piece
  end
  
  def move
    print "\nPick a move!\n"
    free_moves = @board.get_free
    idx = gets.strip.to_i
    if not free_moves.include? idx then
      print "Square is already taken, try again!"
      move
    else
      @board.set @piece, idx
    end
  end
end