5
4
7
8
1
7
8
4
9
9
1
2
7
6
5
7
6
4
8
9
3
9
1
7
8
2
6
3
1
5
7
9
2
7
5
1
Mathematical researchers have shown that the minimum number of givens (17) applies uniquely to the standard 9×9 format.
Mathematical researchers have shown that the minimum number of givens (17) applies uniquely to the standard 9×9 format.
If pointing pairs aren't visible, try box-line reduction. They're inverses — if one fails, try the other.
If pointing pairs aren't visible, try box-line reduction. They're inverses — if one fails, try the other.