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My JS implementation is http://dancing-links.herokuapp.com/

It includes a sudoku (also exact cover) and pentonimo solver.

This make me want to dig up a version I did in Python (for Sudoku as it happens.) The algorithm is a bad fit for Python because attributes are not pointers, but have a look at this:

http://www.cs.mcgill.ca/~aassaf9/python/algorithm_x.html

> One day I decided to write Algorithm X in Python, and I came up with a very interesting variation on Dancing Links.

That's really fun.

I feel like I may be missing something in comprehending that first up mathematical definition in the Exact cover wiki. How is it different from a partition of a set? (https://en.wikipedia.org/wiki/Partition_of_a_set).

UPDATE: think I may see it, sounds like in terms of partitions an exact cover is a subset of a set's partition.

wow, this is insightful generalization