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Evil · Puzzle #199
4
7
2
6
1
9
7
6
9
1
6
2
8
2
5
8
7
1
7
7
9
8
4
4
8
Techniques used
- Hidden Single
- Hidden Pair
- Pointing Pair
- Naked Triple
- Naked Single
- Box-Line Reduction
- Naked Quad
- Skyscraper
- UR Type 1
- Forcing Chains
- W-Wing
- XY-Wing