Axd/Recursive Knockout

Sub-page of Axd

Table of contents

Procedure

  1. all players start with 0 points
  2. pair players with same score (see Tournament Pairing)
  3. after each round
    1. multiply all player's scores by 2
    2. add 1 point to score of losers (that is: skip jigo and byes!)
  4. repeat until enough players have a unique score (the one with 0 points is tournament winner)

Advantages

  • fast, easy

Inconveniences

  • single loss annihilates chance for a place in the finals.

To find out

Background

The example (an ideal power of two) that drove the idea behind this:

  • 8 players named a-h
  • Capital letter = winner of the round
  • Ordered from loser to winner
  • Winners "bubble" to the right, losers to the left, but may not cross '|'

Rounds:

 1. a B c D E f G h
 2. A f C h|e B G d
 3. f H|a C|E d|B g
 4. f|h|a|c|d|e|g|b

Places:

  1. b (3/3)
  2. g (2/3)
  3. e (2/3)
  4. d (1/3)
  5. c (2/3) !
  6. a (1/3)
  7. h (1/3)
  8. f (0/3)
  • This is a strict ordering - there are no ex-aeqos!

This is a copy of the living page "Axd/Recursive Knockout" at Sensei's Library.
(OC) 2008 the Authors, published under the OpenContent License V1.0.
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