- Code: Select all
*-----------------------------------------------------------*
| 9 3 1 | 2457 4578 2458 | 6 d58 25 |
|h28 5 4 | 269 3 2689 | 7 a89 1 |
|g28 7 6 | 1 c589 2589 | 4 3 b259 |
|-------------------+-------------------+-------------------|
| 1 9 3 | 245 45 7 | 28 6 58 |
| 4 6 2 | 8 f59 1 | 3 e59 7 |
| 7 8 5 | 3 69 269 | 29 1 4 |
|-------------------+-------------------+-------------------|
| 5 4 7 | 69 1689 3 | 189 2 89 |
| 6 1 9 | 45 2 458 | 58 7 3 |
| 3 2 8 | 579 1579 59 | 159 4 6 |
*-----------------------------------------------------------*
If r2c8 is 8, then (1) r3c9 is 9, r3c5 is not 9;
and (2) r1c8 is 5, r5c8 is 9, r5c5 is 5, r3c5 is not 5;
so r3c5 is 8, r3c1 is not 8, and r2c1 is 8.
Therefore r2c8 <> 8; stte.