PlaySudoku.us
Expert · Puzzle #158
7
1
6
4
7
9
1
6
3
4
3
8
7
2
9
5
1
7
4
1
6
4
2
8
5
Techniques used
- Hidden Single
- Naked Triple
- Naked Pair
- Naked Quad
- Naked Single
- Pointing Pair
- Pointing Triple
- Box-Line Reduction
- XY-Chain
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.
"When you've got something to prove, there's nothing greater than a challenge." — Terry Bradshaw
"When you've got something to prove, there's nothing greater than a challenge." — Terry Bradshaw