http://bugs.winehq.org/show_bug.cgi?id=21994
--- Comment #15 from Ruslan b7.10110111@gmail.com 2010-03-11 07:26:21 --- 51% on the screenshot :) This means that the game is being transferred from one CPU to another one while being executed. Thus, this screenshot doesn't prove anything.
Though, it's still strange that if affinity mask is 2, the game is still executed on 1st CPU instead of 2nd (and a little bit of 2nd) on WINE.