Reverse BUG Type 3
Reverse BUG Type 3: Because the puzzle has exactly one solution, any pattern that would give two can be ruled out.
How it works on this board
Assuming the target leaves a two-solution BUG pattern
3
2
7
4
1
5
8
5
2
8
6
1
3
9
8
9
2
1
5
7
6
2
8
3
9
4
9
8
4
7
5
2
9
8
7
8
4
9
1
3
1
8
2
8
6
No marks yetPosition 0 / 2