The Best Way To Understand The Sudoku Y-Wing Technique

Today's sudoku is almost unbelievably constructed. It's called Pencilmark Sudoku and it's by Florian Wortmann. The title of the video will need to change but we don't want to spoil anything! Give it a try at the following link:
test.crackingthecryptic.com/s...
[Note: if you have problems loading this puzzle (you shouldn't but we've seen some reports in the comments then you could try f-puzzles in the following link):
f-puzzles.com/?id=yhxamj7n
Rules:
Normal sudoku rules apply. Some cells have been pencilmarked with all of their possible candidates.
In the video several extra were mentioned:
1) Sam Cappleman-Lynes has made an extremely clever 6x6x6 set of puzzles. We have released a solution video for this puzzle on Patreon and you can try to solve it yourself at these links (one to our software, one to penpa (which allows you to increase the size of the grids):
app.crackingthecryptic.com/su...
git.io/JuB3x
2) Christopher Adams' "Phistomefel Ring" crossword is very ingenious. You can play it here:
t.co/5l5yQsYLcv?amp=1
PS If we manage to reach 400,000 subscribers then we'll be releasing a video where Mark and Simon answer community questions! Please email us at [e-mail] if you have a good question for them :)
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▶SOFTWARE◀
Play the puzzle in the video by clicking the link under the video (above). We are building a website which will allow you to enter your own sudoku puzzles into the software and this is coming soon!
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▶ABOUT US◀
Hi! We're Simon Anthony and Mark Goodliffe, two of the UK's most enthusiastic puzzle solvers. We have both represented the UK at the World Sudoku Championships and the World Puzzle Championships.
Thank you for watching!
Simon and Mark

[@evanmino]

This puzzle is a godsend. I've literally gotten stuck on about 5 puzzles in a row on my CTC app, and EVERY time it ended up being a bent triple/y-wing. How cool to basically have a "tutorial" on them!

[@th.nd.r]

This is maybe the best clickbait title I’ve ever seen from CtC

[@skitch76cd]

It’s very “Mission: Impossible” 😊

[@scroogemcduck8509]

Even though I don’t understand why, I thought “better watch it now then” after reading it

[@valentinaanic7541]

Why does he always put the easiest sudokus on the weekends? What happens to him on the weekends?

[@ericbuchner2982]

@@valentinaanic7541 My guess would be that it's based on the the assumption that they'll have more casual viewers on the weekend videos, so that's where they put the easier puzzles.

[@deleetiusproductions3497]

For people reading the comment after September 30, 2021, prior to the aforementioned date, the video had the name "This Video Title WILL Change In 5 Days"

[@goalinsight6530]

It’s awfully rare for me to burst out laughing while trying to break in to a sudoku. Congrats, Florian. That was superb!

[@FlorianWortmann]

Thank you 🙂

[@JaharNarishma]

I managed to miss that break in and found a break in through row 1. That was way more complicated but I got to the same position as Simon, when he got stuck for a while. I was stuck there for 30 minutes... The breakout was hard.

[@mawillix2018]

@@JaharNarishma I seem to have found the same break in as you.

[@BrooksMoses]

I was quite entertained, too, because each bent triple set up another one, and if I'd seen them faster, it would have been like a string of dominoes.

[@slapusillydawg]

I love how much he said "by sudoku" in this video given that there aren't any additional rules 😭

[@amysteele2488]

I think I finally understand bent triples/y-wings now

[@geraldgayowsky569]

Same!

[@awilliams1701]

I've actually thought for a while that it would be interesting to have a puzzle with pencil marks, but holy crap this is like the ultimate version of a pencil mark puzzle!

[@killroy42]

Apologies for the server issues! This was a specially handcrafted data pack and of course I messed something up in the final hour! It should be restored now and I'm checking some scripts to avoid this in the future!

[@FlorianWortmann]

Thanks a lot for all your work, Sven!

[@johnm.runyon3682]

Don’t let it happen again😉

[@TheBiggreenpig]

The puzzle is loading, but after playing for a while, an undo caused the prewritten pencil marks to be gone, and I couldn't get back to the previous state.

[@100greggyt]

@@TheBiggreenpig This just happened to me too. I was very confused and had to duplicate the tab to re-make the correct pencil marks from the original state.

[@Mitrasmit]

@@johnm.runyon3682 dude

[@FlorianWortmann]

What a joy to watch you solve this puzzle, Simon. Thanks so much for the feature! There has been a pencilmark sudoku earlier this year on the discord server, which inspired me to make one myself (unfortunately I don't remember the setter).

[@Paolo_De_Leva]

Your puzzle is very very fun. Thank you for creating it. Is there some other possible logical path for the final break-in, at time 22:56? Is Simon's "very weird and very beautiful" trick your intended path?

[@colin1toronto]

That was a great puzzle. Thanks very much Florian!

[@leetss5841]

@@Paolo_De_Leva Let me know if you get an answer - that’s a good question!

[@FlorianWortmann]

@@Paolo_De_Leva It is indeed the intended way, but in hindsight, I should have smoothened that step a little by making it a normal x-wing instead of a finned x-wing. Apologies to everyone who got stuck at that point.

[@Paolo_De_Leva]

@@FlorianWortmann Thank you for explaining. Nice to know that Simon's "very weird and very beautiful trick" at time 22:56 can also be seen as a *finned X-wing.* Your puzzle is ok as it is. A difficult step, after a long series of very very fun and easy to spot bent triples does not make it less enjoyable, in my opinion. A puzzle becomes too difficult to be enjoyable only when it contains a neverending series of brutal steps which exponentially increases frustration and solving time. E.g., in my opinion these "90 minutes of madness" should have been smoothened in the second part, after a very enjoyable but brutal break-in: kzbin.info/www/bejne/gpnSnGeLa5imnM0

[@SMTRodent]

Puzzles are loading just fine for me now. The statement about enjoying these videos still stands. My thanks to whoever does the IT!

[@illusionmanager]

I'm dutch, but watched so many of your videos, that when I'm thinking in my mind while solving sudoku's, I switch to English ;-)

[@lizzyvv447]

haha :D Ja, dat heb ik ook!

[@ismaelfeigenbaum7937]

@@lizzyvv447 Ja, das hab ich auch!

[@robgimarino]

I love when Simon says something like "No I can't mess this up this has to be a video!" It gives me some kind of journalist vibe who's got a scoop they think the public must now XD

[@juggernaut93]

The opening in this puzzle was SO cool, I love it!

[@FlorianWortmann]

Glad you liked it 😃

[@roland1837]

Thank you Florian for such a great tutorial on bent triples. That is a technique that I've had much trouble with, and this puzzle was fantastic in helping me. Thank you Simon for teaching me how to find them.

[@annokrat]

I'm sensing a bunch of puzzles coming up from this... this 'ruleset' can be combined neatly with thermo, killer, little killer, arrow. knight, ... looking forward to it :-D

[@Nerdnumberone]

Looks like it's a bit annoying to represent visually compared to most sudoku variants since it puts important information in the center of so many cells.

[@BanaiFeldstein]

Sven will need to figure out how to fix the undo problem first.

[@Paolo_De_Leva]

Thanks for not spoiling immediately. That's a great idea and I appreciate it a lot.

[@lmelior]

I loved that opening! I got stuck and had to watch the video, and once Simon used that mental bifurcation trick to eliminate 1 from r5c1 the rest of the puzzle fell out. Such a fun puzzle!

[@100greggyt]

This goes down as one of the most memorable solves on the channel for me. The uniqueness puzzle from a couple months back is one that stands out similarly for me

[@Playmaker6174]

I love how the emotion escalates as the video goes, so hilarious :)

[@faladu9991]

Am a little bit suprisee how often simon says 'by sudoku of all things' when solving what is a classical sudoku with just some pencil marks. I mean every deduction in this video was normal sudoku rules

[@peterbutterjam97]

I mean yes but when you’ve been solving killer XVs and skyscraper puzzles for the last several months and you get puzzles where you have to color the entire grid in before you get a digit by the coloring, it seems kind of silly when you go ‘oh hang on, normal sudoku rules apply too’ and place a five or something

[@amoswittenbergsmusings]

Almost 10 minutes into staring at the grid when I suddenly spotted the Y-wing on the corner cells. Then a homeric laughter at the critical mass nuclear detonation of the flurry of activity when that one Y-wing exploded into heaven knows how many baby Y-wings. From there on rasonably plain sailing. 27:13 altogether. What a brilliant puzzle! No doubt Simon just cracked it wide open from the word go... Florian, a golden buzzer from me - no reservations!

[@botaoadamlee]

Definitely appreciate you not spoiling the break in!

[@garanceadrosehn9691]

I was tempted to start out by first seeing if I could determine the final value of any cells by figuring out what initial values would be needed to generate this set of pencil-marked cells. It seemed to me that would be some sort of huge linear-algebra problem, but then I thought the tactic might depend on some assumptions that (a) I didn't realize I was making, and (b) were incorrect assumptions.

[@glennmelven3414]

I truly enjoyed watching that. I just love the joy Simon shows at finding beautiful logic.

[@ChilapaOfTheAmazons]

I really appreciate that you avoided spoilers in the video title. ❤️

[@RichSmith77]

Too bad if you come to this puzzle in five days, I guess.

[@SMTRodent]

@@RichSmith77 I think even if you get given the trick, it's so much fun unravelling them all that it's very much worth playing.

[@RichSmith77]

@@SMTRodent True. But if it is considered a spoiler now, then it must still be considered a spoiler in five days time.

[@RichSmith77]

Unless in five days time he changes the title to "in ten days time" and commits to updating the title every so often. 😂

[@BetrayedCow]

I was crying from laughter watching all the bent triples chaining off each other, great puzzle and great video!

[@mute1085]

A really interesting puzzle, and a classic one that I could actually solve! The link kinda worked for me, I could solve it, but when I pressed undo just once, the given pencil marks got all broken, so I had to restart it and be careful to never make a mistake.

[@cainau]

I had the same problem with the given pencil marks getting messed up after pressing undo. I was too far in to want to restart, so just restored those cells to their starting state by looking at the start of the video, and then removed options that were no longer available given the state of the rest of the puzzle. I didn't entirely trust the pencil marks from that point on, which is frustrating in a puzzle where the pencil marks are the only clues given, but I made it through to the end.

[@srwapo]

@@cainau That would have been smart if I did that!

[@emisor9272]

You unwind many times and the pencil marks eventually reappear, then you go back forwards all the way to where you want

[@srwapo]

@@emisor9272 I restarted, then rewound so far that it undid the restart, and then I couldn't undo the rewind beyond that point.

[@jdyerjdyer]

After about 10 resets I started taking screenshots. I like to put digits in to visualize what I'm disproving, so I tend to use the undo button a lot. This one hurt me. It hurt me bad.

[@Coyotek4]

55:23 ... *phew* ... for me, this one was deceptively difficult. I was able to catch the 'fun' part early (with all the bent triples), but then I really bogged down for a stretch. I eventually found what I believe to be a logical (enough) way through. Tough puzzle! EDIT ... it was tough for me because I missed the last couple bent triples.

[@jdyerjdyer]

I was so frustrated from the undo/redo issues by the point I got stuck that I just bifurcated on the two x-wings (3s and then 5s) and unfortunately picked wrong on the 3s having to reset the puzzle from a screen shot I took.

[@susanne5803]

I managed the solve with a third of the video, almost an hour and a fifth spaghettification of my brain ... It's a very beautiful puzzle! Thank you all very much!

[@Jablicek]

I love it - like a build-your-own-puzzle! Brilliant work, Florian!

[@kevinarchibald6757]

This was a very fun puzzle, and a great example of why I watch this channel. I love trying the puzzles myself, but I also love all the new techniques and tricks I learn from watching

[@noyadishon6649]

This puzzle is INCREDIBLE I loved it so much!!

[@FlorianWortmann]

Thank you! Glad you enjoyed it 😃

[@RaptozZ]

The coincidence.. Yesterday i struggled at a Kings chess sudoku from your app which turned out to be a y-wing constraint so i watched an old tutorial of yours and barely got it. The literal next day i click on this Video without knowing whats it gonna be and now i completely understand. Thank you!

[@mb-cee140]

Your joy in solving this puzzle was so infectious! Love this channel! 🤓

[@sarahohsiek3671]

this video was so fun to watch !! i don’t always get to follow along with simon since he does much more advanced logic than i can understand but this one was fairly easy to follow along with. i would love to see more puzzles like this keep it up simon

[@GnrcNm]

This is the first time I've ever spotted a Y-wing, and the second time... and third... Thank you Florian for making me feel smart!

[@MadderoftheFew]

Thank you so much Simon for sharing this puzzle! I've been watching for a couple of months now, and I love the channel even though I've never played Sudoku. Recently I've been trying some of the puzzles out before I watch the video (usually the videos that are ~30 minutes long), and this is the first one I've solved. Only took me an hour and 40 minutes, lol. Thanks for the amazing content, and have a good one!

[@vladhatter]

Utterly stunning puzzle. Seeing the bent triples fall away like dominos was remarkable

[@martinyyt]

Loved watching this not only for the terrific lesson in bent triples but also for Simon's infectious joy as he discovered them.

[@Thaplayer1209]

14:50 “How many 3’s have we got? The answer is many.” Really helpful in the progress of solving the sudoku.

[@SilverEchoes]

This was a beautiful puzzle! The solve flowed so fluidly.

[@s4ad0wpi]

Yesterday you said the video title would change in 5 days, but today it says the title will change in 4 days, meaning it ACTUALLY changed after 1 day!

[@PauxloE]

Suggestion for the software: It looks like the black pencil marks are just removed without any traces. Maybe we can get a mode where they are strucken out or grayed out instead, so the original givens are still visible?

[@jdyerjdyer]

Worse, when I used the undo button it wiped my puzzle out multiple times. Started using screen shots to reset.

[@BrooksMoses]

85:08 for me. That was quite a challenge, but a solvable one, and I never really felt stuck for very long once I figured out how to get in. Nicely done, Florian!

[@crazypomp927]

That is undoubtedly the most enjoyable break-in ever featured in a Sudoku. I was cackling with more and more glee with each subsequent bent triple. Wonderful!!

[@princesskhiya3446]

That was such a fun puzzle, I absolutely loved it. And learnt so much about bent triples. I think I'll be able to recognise these going forward. More like these please

[@th.nd.r]

That’s so so so cool of Florian, and also a great solve, way to find that first one of (that technique) and keep running with it

[@FlorianWortmann]

Thank you :-) It was indeed a great solve.

[@pacman52280]

@@FlorianWortmann, I would like to see a sudoku puzzle like this with all 81 cells filled with pencil marks.

[@axavio]

CTC really brings us the very best in puzzles. Every day is a delight. In addition to showing absolutely genius solving abilities, I love how they showcase the world's best setters and have built an incredible community. Bravo!

[@Adrian_Grey]

Unwinding the cascading bent triples was such a fun and clever break in. Fantastic puzzle! Slight technical difficulties: I did unwind at one point and the given pencil marks I had removed didn't reappear. So I skipped forward again and it seemed ok but I must have messed something up cause I ended up with a valid sudoku grid, but the wrong solution... Which is when I discovered the new check function! So that's pretty cool, thanks Sven!

[@mndad2201]

That was one of my favorite puzzles of the year! Fantastic

[@f.b.jeffers0n]

Wow... All the puzzles featured are amazing, but the bent triple chain today made me so incredibly happy!

[@FlorianWortmann]

Thanks, I am glad you liked it 😃

[@pacman52280]

@@FlorianWortmann, you should try to create a puzzle where the only technique necessary to solve the puzzle is the bent triple and put as many of them as you can in it.

[@stupid4President]

That was very elegant. I felt like the creator encoded the starting point of the puzzle and therefore it needed to get decoded to start the puzzle.

[@kellwillsen]

Those linked tripples made me laugh out loud with delight, and it was a fantastic introduction to the technique. Thank you, FW and CtC. 😊

[@Stephen-Fox]

Probably worth mentioning that the Phistomefel Ring is an American style crossword, so even those of us who struggle with easy cryptics can solve it with, if not ease than at least within a reasonable time frame. Very enjoyable. Has some of the really witty sort of American style clues that I enjoy. Puzzle was very enjoyable, although at some point correcting typos with the undo button started to cause the software to randomly delete and reset some given pencil marks. Needed to refer to the start of the to restore my given pencil marks a few times. Bit of a spoiler for Phistomefel Ring comment below to add to my recommendation: . . . . . . . . If anyone remembers when Simon and Mark used to showcase advanced cryptics on the channel, and loved the idea of them but didn't think they'd be able to get good enough at cryptics to get to the really intriguing end game steps, Phistomefel Ring is an American style crossword with an end game that feels like it could be from an Advanced Cryptic, at least to little old me who struggles with cryptics to the point that I've only been able to enjoy advanced cryptics vicariously via Simon and Mark on the channel.

[@thartwig]

Watching someone solve sudoku is never something id think id watch more than once, yet here i am watching my third. I think his process and astonishment almost every time is amusing.

[@Mitrasmit]

What an absolutely genius sudoku ruleset. I can't believe they've never featured one of these before.

[@coyote4237]

Thanks for this. It was interesting to see you solve this.

[@grahambennett3144]

Excellent Y wing tutorial - thank you !

[@osirusbrisbane2305]

What a fun break in!

[@elizabethgrosvenor153]

What a brilliant variation!

[@dearmash]

What a nice new title you've got there!

[@donnyh3497]

This was the funnest puzzle I've done yet!

[@erik.isomer]

I was genuinely giggling while solving this one, what a gem

[@bristolrovers27]

Brilliant puzzle, what a start !!

[@stevanhinten]

im glad i saw this before the title reveal haha. another great solve simon! i really enjoy the content

[@spelldaddy5386]

The countdown is broken. It's said the title will change in 1 day for multiple days already!

[@PaulHobbs23]

What a gorgeous puzzle!

[@helpimadisaster4803]

You likely won't see this, but these shorter format detailed explanations are wonderful, thank you!

[@sokratis5377]

Sometimes when I undo a move most of the black pencilmarks disappear and it is kinda unplayable...

[@SnowTheJamMan]

Never seen this type of puzzle before, looks cool indeed

[@l.s_]

Oh wow, that was fantastic! I really enjoyed this playful way through the logic of the Y-wing. Now I'm hopefully able to apply that technique on puzzles I've been stuck on as well. My streak ended on the very same point as Simon's did. Cracking that r5c1 did the trick, but it was more of an trial and error for me to do that. A great and very rewarding puzzle, thank you!

[@HalfBakedLunatic]

They keep finding these completely new ideas in rule sets ... very logical, very structured ... and completely fascinating! What a great puzzle!

[@furt1v3ly]

Simply brilliant.

[@HelloNotMe9999]

Dude made a Sudoko into a telescope. Well done.

[@thebishop4112]

Enjoyed this immensely. Spotted the break in almost immediately, and had a great time following the chain. Had to get help from the video though for the 18 logic at 22 minutes. I don't think I would have spotted that in a million years, but then again, a year ago I doubt I could have spotted a bent triple if my life depended on it, so I guess that's progress?

[@elrichthain]

Oh crap. I’ve missed a few months of videos and Patreon hunts due to changing jobs. I didn’t quite want to sink my time back into catching up on CtC _just_ yet, but accidentally decided to go ahead and watch one and now I think I’m screwed. There (happily!) goes my day. It’s nice to be back :).

[@TheGerkuman]

This was very good. I have no idea what my time was, but I can say that colouring it did help somewhat.

[@hedgd361]

What an incredible puzzle

[@brianarsuaga5008]

This is a very useful puzzle. I have never been able to scan for bent triples before, but after the first five I was able to spot them!

[@sararielle]

I'm having an issue where hitting undo will erase most/all of the built-in pencil marks. Not sure if that's an issue with the app or the puzzle setting. (It seems to happen intermittently so it may be hard to reproduce.)

[@richardpitham-cole3453]

This seems to be a test version of the software, as shown by the link. I’m playing on IPad and having a range of issues. The undo is not working fully and some of the given pencil mark have reversed between play sessions. Ie, if a cell starts with 1234 pencilled and I work out it can only be 1 or 2, when I come back 3 and 4 are pencilled and not 1 & 2

[@nix_]

You can just keep undoing until the pencil marks come back, and then redo until you get back to where you were before. That fixes the issue, but you need to have an idea of when to stop pressing redo.

[@nix_]

@@hmm7420 Sorry it didn't work for you, hope you found another solution to the problem.

[@stainedClass2112]

fantastic puzzle

[@raspberrytelly]

fantastic stuff simon!

[@jonhansen9622]

That was a very cool puzzle to watch

[@karlwaugh30]

Lovely puzzle. The undo function snapped me a couple of times. Nice ruleset and kinda an obvious one also.

[@sniper1a259]

Those consequent bent triples really made me laugh 😆 exceptionally funny break in

[@mordirit8727]

This is the last time I jump into a puzzle before even pressing play on the video. Got about halfway through my first go before I went and used crtl+z for the first time, the whole board turned white and refreshing just gave me a "this puzzle doesn't exist" screen that took a minute of refreshing to go away =/

[@maybesomedayknown]

Thank you to this puzzle for making me finally really get y wings. Now the trick is just spotting them in the wild in normal sudokus (especially spotting them without pencilmarking the whole darn grid.)

[@11mandylion]

This puzzle is a candidate to be featured in an educational video about bent triples! It took me ages to recognize it, and after that it took me ages to finish the puzzle. Simon picked up on the logic extraordinaryly quick (as usual), I am just glad to see it took him a while to get the puzzle solved after that :D Lovely puzzle, lovely to see it didn't crack immediately after the first batch of logic :)

[@istvanmagi473]

This puzzle starts approachable enough, then it gets insanely hard in the endgame. Absolutely unsuitable for being a tutorial for anything.

[@SMTRodent]

@@istvanmagi473 I managed it and I'm really, really not good at sudoku at all. I needed to watch a bit of the break in to solve at all, learned how Y-wings work and from then on solved it all alone. Perhaps a pencil mark got erased? It definitely wasn't me doing anything clever.

[@BrooksMoses]

Also, 14:57 on Christopher Adams' "Phistomefel Ring" crossword with a couple of Google searches on clues I knew I didn't know. Also, knowing what a Phistomefel Ring is helped me considerably in finishing it, and it was also a necessary disambiguation to keep the soup from tasting of soap. :)

[@MrSaydo17]

That was amazing!

[@notdetails]

Wow what an ABSOLUTELY STUNNING puzzle. Enjoyed solving it so much. Just watched the video and Simon found the 18 much faster than I did 😬

[@SourceOfBeing]

Did they ever do a video where there were multiple sudoku grids which had the same solution, but each grid had a different set of clues, so you had combine each one to solve the full sudoku? I feel like they have but I'm not sure.

[@sheelaghhalstead4549]

That was SUCH fun!

[@legobil_]

Very nice! A puzzle that starts with 10 bent triples if I counted correctly!

[@Kimakae]

What a fabulous puzzle :)

[@DOSSTONED]

Wow, the pencil mark is really useful, especially the starting 69 pair, it seems a clue to tell you to notice "pairs", not 2-pair but tuples,quadruples, etc. I also blocked on the eighth but with checking all possible candidates, I eliminated some numbers to clarify the blocking.

[@zuphix1802]

18:00 is where I got up to before I became stuck and had to watch the video. Great puzzle though, very fun!

[@matthewthorpe5210]

Brilliant puzzle I hope Florian Wortmann can do a KZbin video on making it.

[@rewolff2]

Simon, a trick you missed: at 18:40 you say: "one can go in 4 places in box 4". That's not true: you've got a "doubleton" on three boxes forming a "bent triple" looking at box 4. So a 1 in box 6 forces the 1 in box 9, forces the 1 in box 7, so now there are 4 ones looking into box 4 and the one is placed in box 4. So whichever you chose in box 6 (or 7 or 9) it forces ONE place in box 4. So just like box 6,7 and 9, the 1 in box 4 can only go in 2 places! easy-peasy! :-)

[@mata2723]

Brilliant !

[@nightwishlover8913]

Weird - quite enjoyed that.