PlaySudoku.us
Medium · Puzzle #118
6
8
3
1
6
3
9
7
4
6
3
4
8
5
3
4
2
8
5
1
9
4
6
2
1
7
9
2
9
8
5
"Play the opening like a book, the middlegame like a magician, and the endgame like a machine." — Rudolf Spielmann
"Play the opening like a book, the middlegame like a magician, and the endgame like a machine." — Rudolf Spielmann
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.