PlaySudoku.us
Expert · Puzzle #862
1
7
2
6
8
3
2
9
1
8
4
2
7
6
3
8
5
4
2
8
1
7
4
6
3
2
"We suffer more often in imagination than in reality." — Seneca
"We suffer more often in imagination than in reality." — Seneca
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.