Sue de Coq (isolated)
Reserving a candidate found only in the intersection lets the rest split into a box-side set and a line-side set.
How it works on this board
Reserving the isolated 1 at the intersection lets the rest split into a box set and a line set
8
4
6
7
8
5
2
6
7
1
9
3
4
7
6
5
8
7
3
1
4
4
7
1
9
7
4
5
1
9
1
8
2
5
No marks yetPosition 0 / 2