On no I just read the quuestion wrong and answered 'yes easily'....eeeek
I meant the say the opposite, astagfir Allah. I was going to qualify my answer, so given I made such an error I better do it pretty fast. Allah sustains and supports our world/creation (i.e. the first heaven) and the other worlds. He is beyond creation not dependent upon, whereas Iblis is a creation and thus within creation. Iblis is dependent on being 'created' thus dependent on Allah. Allah is not dependent on Iblis. So Iblis cannot defeat Allah as he is totally dependent upon him (as all creation), whereas Allah is independent from his creation nor is he supported by it. So I guess my qualified answer is Allah can't lose, and in this battle Iblis cannot win. There are no grades of answer.