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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.
This is explicit. If you are not satisfied with it, make a concrete suggestion.
in Chess terms you can see it that way : the board is seen from Black's perspective; White has just moved its pawn to the last (8th) rank and has to choose a promotion piece in order to immediately put Black in check, if possible
I added type hints to the Python initial solution.