If Tiffany's performance is good enough, then Tiffany is still best described as optimising for tic tac toe performance, because:
This changes if Tiffany's performance is not sufficiently high (in which case there may be some other low complexity objective function that Tiffany is best described as optimising).
Epistemic Status: This is basic information, and while it is original to me, I make no claim that the the content thereof is new. Nevertheless, I think it is important enough to be worth posting.