PlaySudoku.us
Expert · Puzzle #862
1
7
2
6
8
3
2
9
1
8
4
2
7
6
3
8
5
4
2
8
1
7
4
6
3
2
Techniques used
- Naked Single
- Hidden Single
- Naked Pair
- Naked Triple
- Pointing Pair
- Skyscraper
- Box-Line Reduction
- XY-Chain
"We suffer more often in imagination than in reality." — Seneca
"We suffer more often in imagination than in reality." — Seneca
In combinatorics, the pattern formed by Sudoku clue cells is studied as a problem in 'hitting sets' and transversals.
In combinatorics, the pattern formed by Sudoku clue cells is studied as a problem in 'hitting sets' and transversals.