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Tournaments played to CSW in North America and sanctioned by NASPA are rated under the NASPA SOWPODS rating system. Thus:
Playing a CSW tournament has no effect on your regular NASPA rating.
WGPO also plans to maintain separate rating systems for each lexicon if such divisions are played. As well as the national systems, all CSW tournaments in North America are eligible to be rated by the World English Scrabble Players Association (WESPA), the governing body of the English game worldwide, under their international system. In other words, if you play a CSW tournament, you can get a world ranking. However, non-NASPA CSW tournaments in North America (such as, e.g., WGPO) cannot be WESPA rated.
The NASPA SOWPODS system is described further on this wiki, but is essentially identical to the regular rating. Those with a regular rating start with that rating under NASPA SOWPODS, but with zero games. Existing tournament software such as tsh and Director! can handle this. Hence, adding a CSW division to a tournament is straightforward.
The WESPA system uses a different formula to NASPA, but the resulting distribution of ratings is broadly similar. A WESPA rating's value is slightly higher than NASPA, so that, e.g., 1950 in WESPA is more like 1900 in NASPA.
Several players are rated under two or more of the rating systems. Here, we list all players who have a NASPA SOWPODS and NASPA rating, plus their WESPA rating if they have one. Currently, this list is compiled manually, and is up to date for the dates shown.
* NASPA full list, Sep 11th 2010
* NASPA SOWPODS list, Sep 11th 2010
* WESPA full list, Sep 1st 2010