Dancing Links is definitely a fun algorithm to implement. I wrote one in Python a while back and included an option to generate graphs as it went through the r

Dancing Links is definitely a fun algorithm to implement. I wrote one in Python a while back and included an option to generate graphs as it went through the recursion tree. I put up a quick page at http://cavernum.net/dlsudoku/ http://cavernum.net/dlsudoku/ demonstrating them.