Sudoku

104 readers

1 users here now

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

Community icon retrieved from https://www.flaticon.com/free-icons/sudoku

founded 2 years ago

MODERATORS

FeatherConstrictor

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

submitted 1 year ago by TimewornTraveler@lemm.ee to c/sudoku

5 comments fedilink hide all child comments

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

top 5 comments

sorted by: hot top controversial new old

[–] metiulekm 2 points 1 year ago* (last edited 1 year ago) (2 children)

spoiler

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

[–] TimewornTraveler@lemm.ee 2 points 1 year ago* (last edited 1 year 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

[–] metiulekm 1 points 1 year 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? :)

[–] TimewornTraveler@lemm.ee 2 points 1 year 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!

[–] Buddahriffic 2 points 1 year 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.