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SODOS
    Keywords: Tournament

SODOS is Sum Of Defeated Opponents Scores.

This is sometimes used as a secondary tie breaker after SOS. It assumes that your strength is defined by the strength of the people that you beat.

Of course some would say that the strength of the people you lose to is equally important. :)

barry

SODOS (also sometimes abbreviated as SDOS) can be used in round robin tournaments, where SOS is of no use.

Matti


I have moved the example of the SODOS tiebreaker conversion from UK to EU scales posted by Steve Bailey to the Discussion page.

Geoff Kaniuk


(wms: In general, this example seems incredibly unclear to me. It is comparing SODOS under apparently UK standard McMahon and Euro standard McMahon, but yet it doesn't take all the differences and group them together in any one place; you have to pick apart the numbers to realize what starting score a shodan gets in England. And what the heck does a statement like "for rating = dan-1 or 0-kyu" mean? Then there is all this X and Y business, and X1 and Y2 and...well, I hope you see my point. Please, can somebody rewrite it so that it can be understood without spending 1/2 hour studying it? The point is quite simple, it should be possible to make the explanation simple also. Further, it shows that SODOS alone is a bad tiebreaker, but it isn't usually used that way, usually it is a secondary tiebreaker after SOS; when used this way, does the same problem exist?)


Christoph Gerlach: Using SODOS as a tie breaker after SOS is also questionable. If SODOS will discriminate between two players, these two players have the same SOS. Let's say Player 1 has a higher SODOS, this means that he has won to stronger opponents compared with Player 2. But he also lost to weaker opponents compared with Player 2 (we know this because both have the same SOS). Would anyone really think it is more significant to win against stronger opponents than losing to weaker opponents?

So clearly then, never use a palindrome when an acronym will do


Geoff Kaniuk:

Hi wms. I have moved the example to the discussion page as the SODOS page seemed to be getting unreadable. Please me know if any further clarification is needed.

As to the question: does it happen when SODOS is used as a second tie-breaker? The answer is Yes in principle, players get different SODOS increments when converting between different McMahon origins. The difference may or may not be enough to change their actual rank position.

In my experience seeing an actual difference in this case is rare. The problem is that it can happen, and so probably does.



This is a copy of the living page "SODOS" at Sensei's Library.
(OC) 2004 the Authors, published under the OpenContent License V1.0.