Chess Wisdom

"Play the opening like a book, the middlegame like a magician, and the endgame like a machine." — Rudolf Spielmann

Chess Wisdom

"Play the opening like a book, the middlegame like a magician, and the endgame like a machine." — Rudolf Spielmann

6 3 8 3 1 6 9 7 4 6 3 4 5 3 4 2 8 1 9 8 5 4 6 7 2 9 2 1 9 8 5

PlaySudoku.us

Medium · Puzzle #118

✓ Completed! 👍

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

00:00

Math Insight

In combinatorics, the pattern formed by Sudoku clue cells is studied as a problem in 'hitting sets' and transversals.

Math Insight

In combinatorics, the pattern formed by Sudoku clue cells is studied as a problem in 'hitting sets' and transversals.