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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.
Very enjoyable kata!
One thing to note though, in the description you say that "one can place in 8 different ways 1 King, 1 Rook and 2 Knights on a 4 x 3 chessboard", however it should be "1 King, 1 Rook, 1 Bishop and 2 Knights" because without the bishop, there are 16 distinct ways not 8. I noticed this because your example placement included a bishop.
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Also experiencing the same issue with haskell