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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.
Simply, if you can count an
A
as 11 points, and after adding other cards' scores, total score stays at 21 or less, you should do it. Otherwise count it as1
. It's hard to get more specific without revealing too many details =/Click over Blackjack link in the kata description to read the wikipedia article. It's by choice.