```On 8/23/05, Dominik Bathon <dbatml / gmx.de> wrote:
> But it is solvable:
>
Since everyone pointed this out, I worked on my guessing code more.
Now I get
+-------+-------+-------+
| _ 2 _ | _ _ _ | _ _ _ |
| _ _ _ | 6 _ _ | _ _ 3 |
| _ 7 4 | _ 8 _ | _ _ _ |
+-------+-------+-------+
| _ _ _ | _ _ 3 | _ _ 2 |
| _ 8 _ | _ 4 _ | _ 1 _ |
| 6 _ _ | 5 _ _ | _ _ _ |
+-------+-------+-------+
| _ _ _ | _ 1 _ | 7 8 _ |
| 5 _ _ | _ _ 9 | _ _ _ |
| _ _ _ | _ _ _ | _ 4 _ |
+-------+-------+-------+

Only Solveable by Guessing
+-------+-------+-------+
| 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 |
+-------+-------+-------+
real	0m0.203s
user	0m0.218s
sys	0m0.015s

And my previous slowest one went from 16.3s down to 0.37s
+-------+-------+-------+
| 7 _ _ | _ _ _ | _ 1 9 |
| 4 6 _ | 1 9 _ | _ _ _ |
| _ _ _ | 6 8 2 | 7 _ 4 |
+-------+-------+-------+
| _ 9 _ | _ _ _ | _ _ 7 |
| _ _ _ | 3 _ _ | 4 _ 5 |
| _ _ 6 | 7 _ _ | _ _ _ |
+-------+-------+-------+
| _ _ 1 | _ _ _ | _ _ _ |
| 2 _ _ | _ 7 4 | _ _ _ |
| _ _ _ | 2 _ _ | 3 _ _ |
+-------+-------+-------+

Only Solveable by Guessing
+-------+-------+-------+
| 7 8 2 | 4 5 3 | 6 1 9 |
| 4 6 5 | 1 9 7 | 8 2 3 |
| 3 1 9 | 6 8 2 | 7 5 4 |
+-------+-------+-------+
| 5 9 3 | 8 4 1 | 2 6 7 |
| 1 2 7 | 3 6 9 | 4 8 5 |
| 8 4 6 | 7 2 5 | 9 3 1 |
+-------+-------+-------+
| 6 7 1 | 9 3 8 | 5 4 2 |
| 2 3 8 | 5 7 4 | 1 9 6 |
| 9 5 4 | 2 1 6 | 3 7 8 |
+-------+-------+-------+
real	0m2.844s
user	0m2.858s
sys	0m0.015s

Should I post my third version, or is everyone sick of looking at my
code by now?