PlaySudoku.us
Evil · Puzzle #509
2
5
6
9
1
4
8
3
8
4
1
3
7
9
7
5
8
2
8
6
9
5
7
1
6
Always update pencil marks immediately after placing a digit — stale marks cause almost all solving errors.
Always update pencil marks immediately after placing a digit — stale marks cause almost all solving errors.
"The most powerful weapon in chess is to have the next move." — David Bronstein
"The most powerful weapon in chess is to have the next move." — David Bronstein