Gerber Schedule (Naturally balanced)

game.rb

def generate_berger_schedule(teams: 8, rounds: 1)
  matches = []
  team_sequence = (1..(teams - 1)).to_a

  (1..rounds).each do |round|

    team_sequence_for_round = []
    games = []
    if round.even?
      team_sequence_for_round = Array.new(team_sequence)
      games << [teams, team_sequence_for_round.shift]
      (0..(teams/2 - 2)).each do |i|
        games << [team_sequence_for_round[i], team_sequence_for_round[(i * -1) - 1]]
      end
    else
      team_sequence_for_round = team_sequence + [teams]
      (0..(teams/2 - 1)).each do |i|
        games << [team_sequence_for_round[i], team_sequence_for_round[(i * -1) - 1]]
      end
    end

    team_sequence = team_sequence.map do |i|
      if (i + (teams / 2)) > (teams - 1)
        i - ((teams / 2) - 1)
      else
        i + (teams / 2)
      end
    end

    matches << games
  end
  matches
end