PlaySudoku.us
Hard · Puzzle #324
2
1
8
3
5
3
4
7
1
8
9
8
2
1
5
4
3
8
8
1
5
8
6
9
4
5
7
6
7
3
"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.