Reverse BUG Type 2
Reverse BUG Type 2: 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
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9
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8
8
9
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9
8
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7
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9
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9
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1
3
9
8
7
1
6
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2
1
1
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7
9
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