If you want cage fights, you should also include the lean contender: http://nsl.com/k/sudoku/aw3.k
(I'll copy it here, because it's short enough for that:
p,:3/:_(p:9\:!81)%3
s:{*(,x)(,/{@[x;y;:;]'&21=x[&|/p[;y]=p]?!10}')/&~x}
Now let's sell tickets to some cage fights, for instance http://www.jsoftware.com/jwiki/Essays/Sudoku versus http://norvig.com/sudoku.html
P.S. The credit at the bottom of the J Sudoku piece led me here: http://www.vector.org.uk/ . Seems an interesting place to visit. It even features articles headed "APL is not for programmers" (quote: "At this point the average programmer turns off, drops out, gets his coat and leaves the building, heading for mom and the kids. We, on the other hand, will continue.")