PlaySudoku.us
Expert · Puzzle #635
7
5
2
4
1
9
1
9
2
8
8
1
5
3
9
9
6
2
3
1
8
4
3
5
Techniques used
- Hidden Single
- Naked Single
- Naked Pair
- Skyscraper
"Chess is life in miniature. Chess is struggle, chess is battles." — Garry Kasparov
"Chess is life in miniature. Chess is struggle, chess is battles." — Garry Kasparov
Network flow algorithms can solve special classes of Sudoku more efficiently than general backtracking.
Network flow algorithms can solve special classes of Sudoku more efficiently than general backtracking.