PlaySudoku.us
Expert · Puzzle #471
7
4
7
5
2
8
1
2
1
6
4
2
1
4
5
8
9
7
5
3
4
9
8
6
6
"No great mind has ever existed without a touch of madness." — Aristotle
"No great mind has ever existed without a touch of madness." — Aristotle
The Swordfish technique extends X-Wing to three rows and three columns — rare but decisive on expert grids.
The Swordfish technique extends X-Wing to three rows and three columns — rare but decisive on expert grids.