- Code: Select all
+-------+-------+-------+
| 1 . . | 2 . . | 3 . . |
| . 6 . | . 7 . | . . . |
| . . 4 | . . 8 | . . 5 |
+-------+-------+-------+
| 2 . . | . . 1 | . 5 . |
| . . . | 4 . . | . . 6 |
| . . 8 | . . . | 1 . . |
+-------+-------+-------+
| 7 . . | . . . | . . 8 |
| . 3 . | 9 . . | . . . |
| . . 9 | . 6 . | . 4 . |
+-------+-------+-------+
1..2..3...6..7......4..8..52....1.5....4....6..8...1..7.......8.3.9.......9.6..4. SE = 7.2
(source: Sudoku Architect)