PlaySudoku.us
Evil · Puzzle #925
7
8
6
3
4
9
7
5
6
3
5
6
5
7
8
9
4
9
9
2
1
5
8
Techniques used
- Hidden Single
- Naked Single
- Naked Pair
- Naked Quad
- Pointing Pair
- Finned X-Wing
- UR Type 4
- Forcing Chains
- W-Wing
- Swordfish
- XY-Wing
- XY-Chain
- Skyscraper
"The mass of men lead lives of quiet desperation." — Henry David Thoreau
"The mass of men lead lives of quiet desperation." — Henry David Thoreau
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.