*.rb

  def solve
    is_solution = @board.partial_solution?(Board.from_hash(params[:solution]))

    if is_solution
      current_user.current_user_game_board.score!
    else
      current_user.current_user_game_board.missed_guess!
    end

    current_user.next_board!

    render :json => { 
      :correct => is_solution, 
      :destination => post_solution_path
    }
  end

  protected

  def post_solution_path
    if !current_user.in_game?
      done_game_path(@game)
    else
      game_board_path(current_user.current_game,
                      current_user.current_board)
    end
  end