Hi gogo, I've tried to work this out, this is the best I could do.
If Maggie wins, she should pick up 222 pts, taking her to a total of 1808 pts. I think that should lift her above both Rubin and Schnyder (that INCLUDES the pts Chanda picked up this week)
If she loses, she should pick up 130 pts which should be enough to just pass Schnyder but not quite enough to pass Rubin.
So, to answer your question, she should climb 2 places (to 13) if she wins and one place (to 14) even if she loses!!!
I'm pretty sure of this but please don't hold it against me if I'm wrong!!!