Det er mange teknikker å lære: - [X-Wing](https://www.sudokuwiki.org/X_Wing_Strategy): When there are  - only two possible cells for a value in each of two different rows, - and these candidates lie also in the same columns, - then all other candidates for this value in the columns can be eliminated. - You can generalize X-Wing to boxes too, but then you just get back strategies like pointing pairs. - In general, X-Wings containing boxes are the inverse of the [Intersection Removal](https://www.sudokuwiki.org/Intersection_Removal) strategies. - [Y-Wing](https://www.sudokuwiki.org/Y_Wing_Strategy) - Skyscrapers