| a | b | c | d | e | f | g | h | i | |
| A | 6 | 1 | 4 | 9 | 5 | 8 | 7 | 3 | |
| B | 9 | 8 | 1 | 4 | 5 | ||||
| C | 7 | 8 | 3 | 2 | 6 | ||||
| D | 1 | 2 | 6 | 9 | 8 | 7 | |||
| E | 3 | 8 | 6 | 5 | 4 | 2 | 7 | ||
| F | 3 | 2 | 1 | 6 | 8 | 9 | |||
| G | 5 | 7 | 6 | 3 | 8 | ||||
| H | 6 | 9 | 8 | 7 | 2 | ||||
| I | 8 | 7 | 3 | 2 | 4 | 9 | 5 | 6 |
First look at column f. There are eight numbers that have already been allocated.
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