PlaySudoku.us
Hard · Puzzle #883
9
5
4
6
7
3
8
5
9
2
6
2
9
4
8
9
6
8
3
2
3
6
9
1
1
3
8
"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
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.