PlaySudoku.us
Medium · Puzzle #703
7
2
4
3
1
1
7
8
5
3
5
2
4
9
6
1
2
4
3
2
6
8
2
5
3
2
1
9
1
6
8
3
2
9
5
6
4
"You have to have the fighting spirit. You have to force moves and take chances." — Bobby Fischer
"You have to have the fighting spirit. You have to force moves and take chances." — Bobby Fischer
Donald Knuth's "Algorithm X" with dancing links solves exact cover problems — of which Sudoku is a special case.
Donald Knuth's "Algorithm X" with dancing links solves exact cover problems — of which Sudoku is a special case.