@board = ['(1)', '(2)', '(3)', '(4)', '(5)', '(6)', '(7)', '(8)', '(9)']

   def is_winner?
        row_one      = @board[0..2]
        row_two      = @board[3..5]
        row_three    = @board[6..8]
        column_one   = @board[0], @board[3], @board[6]
        column_two   = @board[1], @board[4], @board[7]
        column_three = @board[2], @board[5], @board[8]
        diagonal_one = @board[0], @board[4], @board[8]
        diagonal_two = @board[2], @board[4], @board[6]
        possible_winners = [row_one, row_two, row_three, column_one,
                          column_two, column_three, diagonal_one, diagonal_two]

        possible_winners.each do |e|
            if e.all? { |x| x.to_s == ' X ' }
                puts "#{@player_one} Wins!"
                return true
            elsif e.all? { |x| x == ' O ' }
                puts "#{@player_two} Wins!"
                return true
            else
                return false
            end

        end