# File lib/libttc.rb, line 253
  def capture(other_piece)
    if @position = other_piece.position
      @contains << other_piece
      @contains += other_piece.contains
      other_piece.contains = []
      other_piece.captured = true
    else
      raise(InvalidCaptureError, 
        "Piece #{self.name} cannot capture #{other_piece.name}: different locations")
    end
  end