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