PlaySudoku.us
Easy · Puzzle #717
6
1
7
8
2
8
9
2
9
8
6
4
7
9
3
4
6
8
5
9
7
3
4
4
5
1
3
2
9
6
3
4
2
8
1
4
1
9
6
5
8
3
8
2
7
3
1
4
9
"It is not the strongest of the species that survive, nor the most intelligent, but the one most responsive to change." — Charles Darwin
"It is not the strongest of the species that survive, nor the most intelligent, but the one most responsive to change." — Charles Darwin
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.