Here's my implementation of it in (ancient) javascript: http://dancing-links.herokuapp.com/ http://dancing-links.herokuapp.com/ It works nicely in the browser.

Here's my implementation of it in (ancient) javascript: http://dancing-links.herokuapp.com/ http://dancing-links.herokuapp.com/ It works nicely in the browser. Handily, pretty much the same code solves polyonimoes too (and other exact cover problems, though I haven't written any other front ends).