McMahon is a tournament pairing system devised by Lee McMahon many years ago. Details and discussion on this may be found in [ext] Sensei's library.

To summarise:

  • Each player enters at a grade which is converted to a McMahon score: X kyu -> -X and Y dan -> Y-1 except for players above the bar who are all treated as if they are the grade of the bar
  • In each round, pairings are made between players of (approximately) the same McMahon score.
  • At the end of each round, the winners score is increased by 1. (Jigo increases both by 0.5, as does a bye (a round not played by agreement with the organisers)).
  • The winner is the player with the highest final score. (See the [ext] results table of one such tournament).

This scheme is used for the Main tournament and the Weekend tournament.

McMahon last edited by SGBailey on October 10, 2003 - 23:33
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