PlaySudoku.us
Expert · Puzzle #812
9
2
7
7
9
4
5
4
1
8
7
3
6
5
2
8
1
2
8
1
6
7
3
4
Techniques used
- Hidden Single
- Naked Pair
- Naked Triple
- Pointing Pair
- Skyscraper
- Naked Single
- Box-Line Reduction
- XY-Wing
- Hidden Triple
- 2-String Kite
- UR Type 4
- XY-Chain