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Easy · Puzzle #909
8
4
7
1
2
9
2
4
6
3
8
4
1
6
3
9
5
8
6
2
7
4
8
2
6
2
7
9
3
4
6
2
1
8
2
9
7
2
7
5
1
6
3
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.
"I have added these principles to the law: get the knights into action before both bishops are developed." — José Raúl Capablanca
"I have added these principles to the law: get the knights into action before both bishops are developed." — José Raúl Capablanca