Originally Posted by Donald
What do you mean won't affect? It certainly will affect your rating. There is no such thing as "singles" rating - the NTRP rating is the same for singles and doubles. Your doubles matches have on average about 1/2 of the effect compared to your singles matches. The only exception is mixed doubles, which indeed does not count towards your rating.
It won't affect his rating until the end of the year. This isn't league so he can't be DQ'd. He can play 4.0 singles tounaments and 4.5 doubles tournaments until the end of the year when he'll likely be rated 4.5 T.