[Haskell-cafe] Quzzle

Hi, Having read an interesting, but simplistic article on the development of Quzzle in Haskell on slashdot (http://developers.slashdot.org/article.pl?sid=04/12/04/ 0116231&threshold=1&tid=159&tid=156). I was wondering if anyone knew of any more in depth reviews of what Jim Lewis did to create the puzzle. Is there a paper available on it? Thanks Tom Davie -- Computer Science is as much about computers as astronomy is about telescopes -- Edsgar Dijkstra