PlaySudoku.us
Expert · Puzzle #303
4
8
6
1
2
8
8
3
6
4
9
3
8
5
6
2
4
6
5
7
2
3
9
7
"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.