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u/Extreme_Drive2847

Image 1 — Does XY-Wing always work?
Image 2 — Does XY-Wing always work?
Image 3 — Does XY-Wing always work?
▲ 2 r/sudoku

Does XY-Wing always work?

I just learned about this advanced strategy, and I was trying it out (i.e., applying it on every bivalue cells I see) until I discovered this. Am I doing it wrong?

u/Extreme_Drive2847 — 8 hours ago