Loading collection data...
Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
... if isinstance(self.listgrid[0][0], bool): return False ...
Do I understand correctly that this line exists only to counter the specific check, where we are given a board [[True]]?
If so then this algorythm is not general enough. It will fail to validate a board where boolean value comes on any other position than [0][0].
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