Practicing advanced Sudoku techniques - anyone see anything fun here?
Practicing advanced Sudoku techniques - anyone see anything fun here?
I'm working on becoming familiar with wings, chains, uniques, and all the sea animals and skyscrapers. Whatcha see here?
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379 in the upper right box cannot be a 7 or a 9, due to this chain:
Nice! Isn't that also an XY-wing?
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I think we could prove that C9 is 3 by just looking at C3 and H9, right?
edit: named wrong cells
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? :)
it's okay, I think I'm wrong. you have to use remote pairs to solve it
There's also a unique rectangle, too!
I noticed the same thing if you place
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7 in the lower right square if the top left group, makes it impossible to place a 7 in the bottom middle group.