EDIT: Geez, it was just a minor bug... Sorry for the hassle, please remove :)

Next time you should post your solution to the problem instead of editing the question away. Someone may be having a similar problem and come across your solution when they're browsing through search engines.

Of course I would have left it be if it weren't so viciously tied to my lack of focus while coding and thus completely not useful to anyone in the future But yeah, dear stranger from the future - change

self.isPlayerMove

to

self.isPlayerTurn

because that's what you meant and used throughout your game ;)