Sudoku Secrets No. 3: The Y-Wing #shorts

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In response to viewer suggestions, we're planning to make a series of YouTube Shorts (videos less than 1minute long) where we explain some of the secrets of sudoku.

This edition looks at The Y-Wing. You can find a video where the Y-Wing is important here:

Cracking The Cryptic

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I love that in this puzzle the Y-wings just keep appearing when u do one lmao

Excella_

Dear god this was such a cleaner explanation than I had heard before. Thank you.

Boynamedblue

This means R5C5 can't be a 6, right?

bensdream

Ohhh, I spotted the second one! Love these videos, it really helps me grow and get better at Sudoku!

Papierrazzi

It's an interesting puzzle. There were about five more Y-wings unfolding once you did the two pointed out on the video. Then the puzzle felt like it was cracking but towards the end I got stuck.

The finish was tricky. I finally noticed that R4C4 being a 1 would make R5C7 a 1 and there would be no place for 1 on row 9. With R4C4 not being 1, there was an X-wing of 1s on R5C3, R9C3, R5C7 and R9C7. All that was required to finish the puzzle I believe.

rizka

It's quite difficult to see r9c9 (and r7c9, but that wasn't relevant in this video) on mobile because of the like/dislike controls for YouTube Shorts. It might be an idea to frame future shorts with this in mind?

badimus

I love this short. Great example for it, and maybe, just maybe, it is becoming clearer to me ... Thanks for these. I imagine it is just as hard to do a highly-focused and technical short than a Phistomefel in all its glory ... 😊

emilywilliams

I remember the first time I caught a bent triple on the app WITHOUT having to get a hint first. Felt amazing. 😅

arjc

Thanks. I always struggle to see Y-Wings, but this was a great example so hopefully helps me spot them!

GaryH

That's the fun y wing on y wing on y wing on y wing puzzle... and some normal sudoku somewhere in yhe mix just to annoy simon.

livedandletdie

Excellent content as always and as concise as all bobbins.

patrickshanahan

I'm glad you did one about Y-wings because it's a technique I still have to relearn occasionally!

insectbah

A Y-Wing is when I run around waving my underpants in the air.

efa

A more direct way of looking at these 3 colored cells is ‘123’ form an XYZ system whereby 3 at r9c9 would eliminate the 3 at both purpled cells leading to1 at r1c9 and 2 at r9c1, resulting in r1c1= 0, a contradiction! Therefore 3 cannot be at r9c9.

ckoh

Yeah that's the part I get. But I can rarely spot them. If I'm told the central cell of the y-wing I can usually figure it out. but more often than not I have to rely on the smart hint feature to "spot" them for me. I was playing thermo a few days ago and managed to spot a few of them. I felt pretty amazing after that.

awilliams