Pro Tip

When a row, column, and box all intersect, the intersection cell is the most constrained — always check it first.

Pro Tip
✓ Completed! 👍
9
7
6
1
8
3
7
6
3
8
7
2
5
2
7
9
6
4
2
9
7
5
5
4
3
Chess Wisdom

"The pin is mightier than the sword." — Fred Reinfeld

Chess Wisdom