Tricks to become better at Fortress Sudokus

Fortress sudokus can be hard to tackle. This video explains some of the basis things that may help your solve become comparatively easier.Do check out the vi

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I tried to apply the swordfish technique on 6. The highlighted square is the one I eliminated. It's also the location of 6 for that group. How? : r/ sudoku

Can someone give me a hint/clue on which square I should be focussing on here? : r/sudoku

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