Ok, I figured it out also...
solving nr 1 2.015000 0.000000 2.015000 ( 2.016000)
···
-----Original Message-----
From: David Tran [mailto:email55555@gmail.com]
Sent: Tuesday, August 23, 2005 3:49 PM
To: ruby-talk ML
Subject: Re: [QUIZ] Sodoku Solver (#43)> Adam Shelly wrote:
> ...
> And it took a while to figure out that this one was unsolvable:
> +-------+-------+-------+
> > _ 2 _ | _ _ _ | _ _ _ |
> > _ _ _ | 6 _ _ | _ _ 3 |
> > _ 7 4 | _ 8 _ | _ _ _ |
> +-------+-------+-------+
> > _ _ _ | _ _ 3 | _ _ 2 |
> > _ 8 _ | _ 4 _ | _ 1 _ |
> > 6 _ _ | 5 _ _ | _ _ _ |
> +-------+-------+-------+
> > _ _ _ | _ 1 _ | 7 8 _ |
> > 5 _ _ | _ _ 9 | _ _ _ |
> > _ _ _ | _ _ _ | _ 4 _ |
> +-------+-------+-------+Euh ... mmm....
my program tell me that is one has unique solution ( on
16.672 seconds )
+-------+-------+-------+
> 1 2 6 | 4 3 7 | 9 5 8 |
> 8 9 5 | 6 2 1 | 4 7 3 |
> 3 7 4 | 9 8 5 | 1 2 6 |
+-------+-------+-------+
> 4 5 7 | 1 9 3 | 8 6 2 |
> 9 8 3 | 2 4 6 | 5 1 7 |
> 6 1 2 | 5 7 8 | 3 9 4 |
+-------+-------+-------+
> 2 6 9 | 3 1 4 | 7 8 5 |
> 5 4 8 | 7 6 9 | 2 3 1 |
> 7 3 1 | 8 5 2 | 6 4 9 |
+-------+-------+-------+
+-------+-------+-------+
1 2 6 | 4 3 7 | 9 5 8 |
8 9 5 | 6 2 1 | 4 7 3 |
3 7 4 | 9 8 5 | 1 2 6 |
+-------+-------+-------+
4 5 7 | 1 9 3 | 8 6 2 |
9 8 3 | 2 4 6 | 5 1 7 |
6 1 2 | 5 7 8 | 3 9 4 |
+-------+-------+-------+
2 6 9 | 3 1 4 | 7 8 5 |
5 4 8 | 7 6 9 | 2 3 1 |
7 3 1 | 8 5 2 | 6 4 9 |
+-------+-------+-------+
but the other (wrong) version was so damn fast 
cheers
Simon
p.s.: I vote for a new Quiz:
find false answers to sodukus realy quick