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Evil · Puzzle #566
5
3
7
1
9
2
7
8
1
4
6
1
5
6
3
8
1
4
8
4
8
3
7
2
Techniques used
- Hidden Single
- Naked Triple
- Pointing Pair
- XY-Chain
- Forcing Chains
- Naked Single
- Naked Pair
- Box-Line Reduction
- Skyscraper
- Naked Quad
"Well done is better than well said." — Benjamin Franklin
"Well done is better than well said." — Benjamin Franklin
Mathematical researchers have shown that the minimum number of givens (17) applies uniquely to the standard 9×9 format.
Mathematical researchers have shown that the minimum number of givens (17) applies uniquely to the standard 9×9 format.