PlaySudoku.us
Evil · Puzzle #903
3
1
6
8
2
7
9
8
6
4
7
5
2
9
8
5
4
6
1
6
3
2
5
Techniques used
- Hidden Single
- Naked Single
- Naked Triple
- Pointing Pair
- Box-Line Reduction
- 2-String Kite
- Finned X-Wing
- XY-Chain
- XY-Wing
- Naked Pair
- Forcing Chains
Box-Line Reduction: if all candidates for a digit in a row or column are within one box, eliminate that digit from the rest of the box.
Box-Line Reduction: if all candidates for a digit in a row or column are within one box, eliminate that digit from the rest of the box.
The minimum number of clues (17) needed for a unique Sudoku was proved by exhaustive computer search in 2012.
The minimum number of clues (17) needed for a unique Sudoku was proved by exhaustive computer search in 2012.