Reverse BUG Type 4
Reverse BUG Type 4: 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
7
8
5
9
2
3
9
2
3
7
5
8
2
3
8
7
5
9
8
2
3
9
7
5
3
2
8
4
8
1
2
3
3
5
9
8
2
2
4
3
8
5
7
7
8
2
3
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