```ruby
require "tic_tac_toe/version"

module TicTacToe

  class Game

    def initialize display
    end

    def start
    end

  end

  class Board

    def initialize
      @_marks = Array.new(9, " ")
    end

    def pos index
      @_marks[index]
    end

    def move index, mark
      @_marks[index] = mark
    end

    def won
      @_marks[0]
    end

  end

end
```

Add data about winning index sets to Board
user
```ruby
require "tic_tac_toe/version"

module TicTacToe

  class Game

    def initialize display
    end

    def start
    end

  end

  class Board
    @@win_places = [[0, 1, 2],
                    [3, 4, 5],
                    [6, 7, 8],
                    [0, 3, 6],
                    [1, 4, 7],
                    [2, 5, 8],
                    [0, 4, 8],
                    [2, 4, 6]]

    def initialize
      @_marks = Array.new(9, " ")
    end

    def pos index
      @_marks[index]
    end

    def move index, mark
      @_marks[index] = mark
    end

    def won
      @_marks[0]
    end

  end

end
```
assistant