PlaySudoku.us
Hard · Puzzle #661
4
6
1
7
9
5
7
4
4
3
2
3
2
9
2
1
5
7
9
1
8
5
6
2
5
1
"The threat is stronger than the execution." — Aaron Nimzowitsch
"The threat is stronger than the execution." — Aaron Nimzowitsch
"A bad plan is better than no plan at all." — Frank Marshall
"A bad plan is better than no plan at all." — Frank Marshall