def game(game_seeds, ranks)
      game_seeds.each_with_index do |iseed, i|
        game_seeds.each_with_index do |jseed, j|
          next if i == j
          @raters[iseed].add(player(jseed).rating, Util.ranks_to_score(ranks[i], ranks[j]))
        end
      end
    end
def game(game_seeds, ranks)
      game_seeds.each_with_index do |iseed, i|
        game_seeds.each_with_index do |jseed, j|
          next if i == j
          @raters[iseed].add(player(jseed).rating, Util.ranks_to_score(ranks[i], ranks[j]))
        end
      end
    end
Register a game with this rating period

 @param [Array<#rating,#rating_deviation,#volatility>] game_seeds ratings participating in a game
 @param [Array<Integer>] ranks corresponding ranks