3 - 5: league style (each player will play against each other)
  6, 8 and 10: divide into 2 groups and the winner of each group will play to be the winner
  7: divide into 2 groups (4 & 3) and the winner of each group will play to be the winner
  9: divide into 2 groups (5 & 4) and the winner of each group will play to be the winner
  11: divide into 3 groups (4 & 4 & 3) and the winner of each group will play against each other
  12 and more: divide into 4 groups and the 4 winners will play in tournament style

  For example, all 3 players are (1 win/1 loss) in 3 player matches, or 2 players are (2 win/1 loss) in 4 player matches
  Then calculate the (score difference x 10) of each game and the person with more points wins.
  For example, if the game score is 6 to 4, 20 points will be added to the winner for the game.

  If a player withdraws in the middle of the match, the score difference will be calcurated as it is. For example, if a match ends with 3 to 1 scores, 20 points will be added to the winner.
  If a player withdraws before starting the match, 30 points will be added to the winner.