Sudoku

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A community for sudoku (and similar) puzzle-solvers! Share your techniques, ask questions, or post memes (are there such things as sudoku memes?)

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Practicing advanced Sudoku techniques - anyone see anything fun here? (lemm.ee)

submitted 8 months ago by [email protected] to c/[email protected]

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I'm working on becoming familiar with wings, chains, uniques, and all the sea animals and skyscrapers. Whatcha see here?

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[–] [email protected] 2 points 8 months ago* (last edited 8 months ago) (2 children)

spoiler

379 in the upper right box cannot be a 7 or a 9, due to this chain:

[–] [email protected] 2 points 8 months ago

I noticed the same thing if you place

spoiler

7 in the lower right square if the top left group, makes it impossible to place a 7 in the bottom middle group.

[–] [email protected] 2 points 8 months ago* (last edited 8 months ago) (1 children)

Nice! Isn't that also an XY-wing?

spoiler

I think we could prove that C9 is 3 by just looking at C3 and H9, right?

edit: named wrong cells

[–] [email protected] 1 points 8 months ago (1 children)

Huh, I have been looking at the grid for like 10 minutes after seeing your message (with the edit) and can't see it at all. Could you explain some more? :)

[–] [email protected] 2 points 8 months ago

it's okay, I think I'm wrong. you have to use remote pairs to solve it

There's also a unique rectangle, too!