This Sudoku Actually Teaches The X-Wing Technique!
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- เผยแพร่เมื่อ 27 ต.ค. 2020
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Today's sudoku is a genius construction by Sam Cappleman-Lynes. You can play it here:
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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. We're also "cryptic crossword" aficionados. Mark is the twelve-time winner of The Times championship and Simon is the former record holder for most consecutive correct solutions to The Listener crossword. We hope we can help your puzzle solving while also introducing you to some of the world's best puzzles.
Thank you for watching!
Simon and Mark
"I even spotted the swordfish before I spotted the X-wing on the eights!" - things you can shout on the street corner to make people think you're insane.
Haha! Totally!
I spotted the swordfish first thing... the swordfish on the 7s! Doesn't help that much at the beginning, but it came into play midgame.
"They should use this puzzle to teach the X-wing in Sudoku School!"
I'm pretty sure you just did ;)
Wait, there's a sudoku school ???
@@DeletedUser410 i'm screwed :'( lol
If any of my teachers would break down to almost tears at a sight of a problem, i'd just walk out.
All i got from this episode was "its beautiful" n times > quickly brush over the actual explanation of why it is, and why/ how it facilitates the next steps. I suck at Sudoku, but i've seen them solve A LOT of episodes and i was able to keep up. If i was new, would have been interested in learning sudoku and would have clicked on the video based on the title of "Actually Teaches" , i'd have given up half way through, thinking its not for me :))
Unpopular opinion, don't take me to the stake pls. Edit: its true, you could say, just use the pause button
Andrei-Razvan Tutuianu p
Things we have learned so far on Cracking the Cryptic:
1. 10 is not between 1 and 9 and cannot be placed in a sudoku
2. the numbers from 1-9 sum to 45
3. the end of a month means that it is almost the beginning of a new month
"We cannot place the same digit more than once in a row, column or box for very obvious reasons"
"we can't place 0 into the grid, well we can since I'm in the new software"
Schrödinger cells are not allowed (on this channel)
"Bobbins" is the family-friendly substitute for "bollocks".
"Let's get Cracking" is not prison Lingo, but the other way to stimulate your mind with puzzle logic.
For beginners like me it’s very educational that you put in a video like this occasionally. Thank you!
I'd love to see more puzzles like this one. Maybe not all the time, but at least occassionally.
As a newer watcher to the channel, I really appreciate how educational this video was.
Even though this one seemed pretty simple to Simon, I feel that the explainations on X-Wings and Swordfishes are really valuable to help people understand how you're solving the more complex puzzles.
the hard thing about x -wing swordfish etc. is not to understand these but to find these in a sudoku. i love these simpler videos as well because im still a beginner.
Check out some of their older videos! In the second half of 2019 they released many videos teaching classic sudoku techniques and they are super helpful if you want to get better! The CTC Catalogue is a good resource for this. Find the link in the video description.
@@necaton Agreed. Spotting them is definitely the hard part. (In particular useful ones.)
After spending 30 minutes looking for X wings and getting nowhere I managed to find some cake for the rest of the video.
There's another solution involving a bunch of 4-8-9 triples and subsets thereof.
Space cake is the best solution for all sudokus
It's breathtaking!
Oh my god. I finally understand x-wings and swordfishes. The puzzle lays it out so well and it's explained so well. Thank you, Simon and Sam.
Now, to apply this new knowledge and get better at spotting these patterns in the first place...
Try the Tattooine puzzles. All the swordfish you ever need.
Also, the patterns are pretty easy to spot with a software that automatically colors all other same digits when you click on one
Yes, that's going to be the tough bit. Will this understanding remain tomorrow morning, after making the coffee and before the codeword? That is the question. As Carole King put it: tonight you're mine, completely...
Brilliant symbolism to use the digit 4 for an X-wing and 9 for the swordfish!
I have no idea how Simon is able to maintain such a level of enthusiasm when performing the mundane “unwinding of pencil marks,” but I’m glad he can, because I find it strangely riveting!
The most simple puzzle you solved but it's the one that taught me the most , thank you i love your videos
Please thank the setter for the teaching puzzle. I now have a fantastic example to refer to and learn from. I hope this setter and others come up with more fantastic teaching puzzle examples. Hard puzzles are fine and interesting but only with teaching puzzles are we who are not as adapt going to be able to eventually attempt and solve the challenging ones. A really good teaching puzzle is probably the hardest and most challenging type to come up with.
8:54 "This makes you feel like the Universe is in order" LMAO this was a great quote!
The X wings and swordfish were shouting at Simon. They must have been muted for me. I didn't hear them. What shouted at me was X-Wings in the title of the video. So after placing all the 1s 2s and 3s, I went X-wing hunting. Found 3 of them and a swordfish.
Absolutely. I'm stuck at a place where I understand X-wings and swordfish, I get how they work, they seem obvious when pointed out in the video.....but I struggle tremendously to find them on my own
Exactly how I felt.
Same here. LOL. First thing I found was the X-wing on 4 in R3,9 x C1,7, then a swordfish on 6 in R4,5,8 x C1,4,7, a swordfish on 7 in R5,8,9 x C1,4,7, and a jellyfish on 8 in R1,2,5,6 x C2,3,5,9... then the last crack was the swordfish on 9 in R3,4,9 x C1,4,7 and just using the original X-wing on 4 to clean up my pencil marks.
Yes, so I saw the title and I was like mhh I might need X-wings but I didn’t found a single one
*Sudoku puzzle exists*
Simon: Uh, this puzzle is just beautiful.
Far from that! The thing is that here you only see the cream of the crop in terms of puzzle setting. Everything is kindly tested and filtered by the CTC community before Simon or Mark have a go at it in the channel.
oh this is a lovely puzzle that finally helped me to get to grips with x-wings, i needed the guidance of where the 4 and 8 x-wings were, and then the swordfish of 9 (something i haven't learnt to utilise yet), and from there managed to solve without further help. Would love to see more classic sudoku like this now and then!
Usually what I do (often after getting stuck) is select a digit and just start using highlighting to mark rows, columns, boxes, and cells that I've either already filled in or know cannot contain the digit I'm looking for, and then it becomes much easier to see the patterns. If I can find a set of X rows where the digit is locked into the same X columns in each row, it likewise has to be locked into those X rows in those columns, so I can go up and down those columns excluding it from all the other rows. The same applies if a set of X columns exists where it's locked into X rows.
Very nice! I struggled to find x-wings on this, even knowing they were there from the title. Watching Simon find them is so satisfying, and the exposition so elegant. It's also amazing how such a tough puzzle becomes so easy once you find a couple of restrictions - very well set!
your enthusiasm is very contagious :)
as a very basic and sporadic sudoku player, x wing and swordfish are new tecniques that i am struggling to pick and finally i found the right puzzle. thank you so much for being so nice and eloquent while explaining.
you make me miss the time i lived in england :)
I'm finding myself solving sudokus hearing your voice in my head instead of mine!
Bookmarked this video for future reference. Out of all your advance videos, I feel like I learnt the most from this one. So simple yet so many advance techniques
Just wanted to give this channel a compliment. I’ve always been aware of sudoku, but never a huge fan until I watched one of your videos a few weeks back. Now, I literally watch the daily video as I’m going to bed every night and can’t help but play throughout the day.
Currently lying in bed in New Orleans with no power after sitting through a hurricane this evening, and here I am watching again. Tree fell on my car, and a lot of cleanup to do tomorrow, but I won’t be deterred.
Over the last couple of weeks I have really appreciated your videos as I begin trying to tackle more challenging sudoku's.
If you didn't spot the swordfish like I didn't, this can be completed with 5 different x-wings! The 4s first, then 8s, 7s, 6s and 5s. I'd much rather have spotted the swordfish but I was impressed with myself for finding all these and my 43 minute solve :)
Your solve must've been similar to my solver's solve. My solver seeks X-Wings but not swordfishes. It found 4 X-Wings in the order you did (4s, 8s, 7s, 6s) after which it solved 5s as a hidden pair (R5's 6 and 7 are at R5C4 R5C7).
Yes I pretty much did the same solve as you, in 37minutes.
I love your appreciation for the puzzles people send to you ❤️
the way its build to gradually introduce more complex techniques is brilliant
it starts with 1,2,3 which are elementary and easy , than you need to use the markings, and so on..
the fact it uses the number 4 to teach X-wing that involves 4 squares and 9 to teach swordfish that involves 9 squares is also a beautiful touch
this not only teaches but only allows you to see where you stand in your current ability , where you should improve
Excellent puzzle to go from novice to intermediate! Always struggled with x-wings and swordfishes but it's amazing how intuitive this puzzle makes them. This puzzle deserves a spot on the first page of the book. Cannot wait for my copy!
I started watching this channel to get some tips on classic sudoku (coz I didn't know there was another kind). But it's just so interesting watching them work puzzles that I keep muddling through with my classics on the buss and watch them at home.
This was excellent. Negative constrains are always a bit hard to remember for me... I have a really hard time finding these techniques inside of puzzles that were not designed to explicitly highlight it, such as this one, but this was really helpful to try and understand the ways a little bit better. Thanks for walking us through the logic, Simon. Always appreciate it.
I feel this should be in the book (or any sudoku book) as a practice piece even for advance solvers! That was wonderful!
Had a breakthrough thanks to this video! More sudoku than ever are within my humble reach. Thank you, Simon sensei!!
I have no idea how I'd ever think to spot this sort of overlapping X-wings and sword fishes. But another one of your videos taught me the concept of uniqueness and I've actually used that a few times since. So thank you for your public service.
Such a beautiful puzzle. Took me half an hour to finish and I loved every minute of it! Loads of fun to chase all these Swordfishes and X-Wings
Thank you :)
Great puzzle, I was led into the same solve path as you, Sam holding my hand and guiding me along the whole time!
Seems to me that this would be an excellent candidate for the book...
Brilliant - thanks Sam for design and Simon for explanation.
I am so proud I've spotted everything that you spotted while solving it, beautiful puzzle indeed, i think i could never ever gotten it without watching this channel regularly.
You are an excellent Sudoku teacher. You explain the techniques in a way I can understand. I am a novice when it comes to doing Advanced Sudoku. I did this one along with you and hoping that soon I will be able to start doing more on my own. I understand the X-Wing and the swordfish concept, but I don't think I will be able to spot them on my own yet.
Love your enthusiasm!
Your enthusiasm is contagious!
I'm pretty certain I saw this video back when it was first published and likely one of the first few times I heard about X-wings and Swordfish. Still learning how to spot them but can proudly say that I came back to it to verify my solve of this very same puzzle in the book, delighted I found them looking to see how Simon explained them to us back in the day. Lovely. Also, having the Kickstarter advertised at the start is a nice coincidence, surely Simon didn't know at the time this puzzle would end up in it!
Thank you for this sudoku. It served as a nice test example for the X-Wing part of my solver.
These videos are helping me SO much, I really appreciate your explanations!
This was really helpful. Great teaching and great puzzle.
Thanks to watching this channel I was able to do this puzzle, where I used a number of X wings and even a swordfish to solve it! Time to watch you do it in a much simpler way!
Wonderful progression with your solve Simon. Excellent execution!
I had at least heard of an X-wing but didn't fully understand how to spot them. I had never heard of a swordfish. I've only been watching this channel for a couple weeks so I'm still learning about all these advanced techniques & trying to break my urge to put pencil marks everywhere. My novice self loves videos like these!
Yes this was actually really helpful. I finally understand the X wing perfectly.
I've played with Sudoku casually here and there over the years, but just recently found your channel and have learned an immense amount about the techniques used for harder puzzles - knowing how to solve some of the harder one made it a far more enjoyable hobby! Thank you for teaching Sudoku techniques through videos like this one and others!
Do you have a good resource to find good, hand-picked Sudoku puzzles? Looking primarily for classic Sudoku, but wouldn't mind a few Killer or Knight's Move puzzles as well.
Thanks, Sam couldn’t have explained it any better!
I see plenty of videos on solving sudoku, but I'd like to see how sudoku puzzles are made. Perhaps an interview with Sam Cappleman Lynes?
The enthusiasm is off the charts. This was very instructive - I'd just learned this kind of thing from doing tatooine sunset. Where I did nothing but this type of thing but with more rows and columns. This is much simpler here. Funny that X wings, swordfish, and jelly fish are all the same thing, just 2, 3 and 4 sets of rows and columns.
Best explanation of the logic of x-wings and swordfishes I've ever seen. Bookmarking this!
This was awesome thank you!
This was also a great tutorial of using the highlighting to find the swordfish and xwing patterns. I’ve been resorting to filling in all possible digits once I get past all the obvious techniques. While it helps a bit to isolate these advanced patterns, it makes the grid really cluttered. The highlighting mitigates that a lot. Thanks for another great solve explanation :)
finally i have a puzzle that perfectly illustrates the swordfish technique this is amazing thank you
I spotted the pattern with the fours but I wasnt sure what to do with it. Thanks for explaining, it's really great technique!
An important thing to know about the Swordfish is the fact that it doesn't have to be 3 available spots in _every_ row (or column, respectively).
Each row (or column) needs to have only TWO possible spots, as long as each row (or column) corresponds with at least 2 spots within the other 2 rows (or columns), and the corresponding spots do not necessarily have to be in the same row or column.
THIS!! I never seem to manage to see the blummin' things :(
I've been watching this channel for a month. I spotted things I never would have seen a month ago.
I wish to see more puzzles like this, to learn advanced sudoku techniques.
I'm showing this video to my puzzle club at school to introduce them to advanced sudoku logic. Timing couldn't have been better
Great video, thank you.
I absolutely love this sudoku even though it took me 02:09:13 to do it. I refused to give up.
After finishing it, I watched the video.
You made it look so easy. I learned and now understand the swordfish. The way a cracked the puzzle was finding
four X-wings (4,6,7,8). Thank you for this GREAT video.
i got to the same stage at Mark at 5:42. it took me 20 minutes to solve from there as i didn't see the obvious x wing, and instead, did swordfishes on 6's and 7's which helped eliminate a few squares, and made some pretty colours in the box, but didn't actually get me anywhere productive. i thought 4's were useless, and only when i was finished with my pretty 6's and 7's did i check for x wing and swordfish's for 4's, and the puzzle was done in under 2 min's once i saw it. This video is really useful in showing to me how much faster i could have solved it if i look at the given numbers and look for those patterns directly!
Thanks for this video. It's much clearer to me than the app. I wish the app instructions had some sort of way to reduce some of the visual clutter. With everything pencil marked in it gets confusing.
Really enjoyable puzzle, done in 12 minutes
Classics! It's a fun solve and not too difficult
This was great 🙏💯
Superb thank you
21:07 it took me a bit to identify where should I look for the X-wing, but finally Iooks like I learned well from the best
Just started sudoku little less than a month ago. I do little booklets but I like watching this channel for the ones with interesting restrictions and less digits.
So apparently I’ve been working these x wing and swordfish things out without pencil markings or any kind of coloring, and it’s been really hard on my brain lol.. probably a good mental workout, but this video certainly helped me organize the stuff in my head better.. might eventually start using a pencil and/or coloring for some of the incredibly difficult sudoku puzzles in my book. Otherwise I’m going to keep staring at puzzles half done for about 2 hours before I crack through one digit that pulls me a bit closer to the end.
Thanks for the video as always!!
This is a really good tutorial to bring solvers up to an intermediate level.
thank you so much for that.
I am so happy I've found CTC, the joy in solving those puzzles showed to me the beauty in Sudoku. It dragged me in and purchased so far only Classic Sudoku app on Android and damn, even greenie amateur like me can see the difference between computer made Sudoku and crafted one. It's so good and pleasant. I am grateful for possibility to see ALL of the mistakes. This helps me confirm if my logic and way I solve is correct and if not I keep going until I find reason why I was wrong.
Also solve of this particular Sudoku by Sam also helped me understand better not only how those techniques actually looks but how to use them.
I simply Thank CTC team
i'm obsessed with this man :')
Brilliant puzzle
The universe is in order. There is some purple behind everything.
Yes, finding the "purple" behind everything is awesome!
Magnifico!!
28:35. And was able to spot the x-wing on 4s and swordfish. Great puzzle and highly instructive.
This puzzle works! At 16:12 I managed to spot yet another X-wing in rows 1 and 2 for the 8ths (assisted by the 68 pair in box 6). This made me able to spot where the 8 in box 2 should go.
I'd never watched anyone solve a Sudoku before or give names to the patterns that appear - I wouldn't have thought a Jellyfish would be helpful but it must be if it has a name! Unfortunately I didn't see one of the swordfish patterns, but a comment here pointed it out. Thanks for posting these and keep them coming - they are fabulous!!
Thank you for breaking down the x-wing technique, I've always been a little confused by it.
I _understand_ x-wings and swordfishes, I'm just rubbish at spotting them. Even after it was clearly telegraphed in the title that x-wings would be the key to this puzzle it took me a painfully long time to find them.
It would help to see if the software would automatically highlight a number (and any pencil marks for that number). One of the first Sudoku apps we used would do that.
Thank you , thank you
Absolute sudoku beginner here, paused video at beginning, copied board to online sudoku program and took two hours to solve this. But oh my it feel good when I finally solved it :).
5:09 is when I got stuck.
You then explained it beautifully.
So pleased with myself - did this in 21:31. Definetely improving on spotting those X-wing/swordfish patterns.
And seeing the video was atound 18 minutes, I thought we solved it in almost the same pace.
But after watching you solve it, I see you spend like 15 minutes explaining the X-wing and the swordfish :'D
You destroyed that puzzle's defenses. Well done.
8:55 a transcendent moment in Suduko. Now I see why people love it so much!
An excellent puzzle from Sam. As you say .. good teaching and practice material. I did it twice, just for practice. More please. On a side note, I do not live in UK, but I managed to find some videos of Sam on Countdown. Tremendous performances. It would be a treat to see Sam go head-to-head with Mark on a cryptic! (Wishing for the moon, I know!).
This is the best puzzle because I finally understand the swordfish technique. I realize that sounds silly, but I knew it was a thing but I just couldn't bring myself to fully understand it. Thank you, I finally got it!
Gene
I'd love to see (even as just a one of video) some super speed solving of classic easy or medium puzzles. It'd be a nice change of pace.
Saw the title, immediately tried the solve, 21:48. Pretty happy with it, though I didn't spot the swordfish, I did it with with a 4-8-9 triple in the lower left corner. I did, however, find a couple of X-Wings which made me happy :) they're usually not easy for me to spot.
14:18 Brilliant puzzle!
Well, this just shows I’m not ready for advanced sudoku lol 😂 I just found this channel this week and started sudokus for the first time.
Add this one to the book!
Ah, I needed that breakdown of how to see it! I started to see some, but that gave a lot more clarity. 27:29 after stopping midway through to get help on the first 2 X-Wings. I also spotted the swordfish earlier, but I wasn't sure if it was one, so now I know how to see that better, too!
Under 27:24 this time, after I forgot to pause when I went to do something else. Making progress, not using help!
20:56 this time. Slowed down a bit at the end because I kept hitting the wrong numbers.
25:54. Solved by identifying three X-Wings and finally a Swordfish on the 9s to crack the puzzle open. As this seemed difficult but approachable, I finally gave one puzzle a try
After having read up, and watched a few films, on x-wings and swordfishes I think I finally get it. Part of their effect is on the squares that are the x-wings/swordfishes themselves, and partly as a negative constraint. Time to get back to work.
I have found another X-Wing while following. Around the 10:30 mark where you show the x-wing with the 8's, look at the middle box. Now the 8's can only be in the squares directly below 1, which creates another X-wing with the 8's in the middle left box. That puts the 8 in the middle-right box to the top left, and 6 below that, and so on. Thats how I proceeded without seeing the 9's X-wing :)
Nice puzzle! I did it in 38:14 using one X-wing on 4, a swordfish on 7, the 4-column equivalent of swordfish/X-wing on 8, and finally a very nice swordfish on 9.
While I already understood X-Wings, it is always good to see reinforcing lessons. What I found most interesting was the swordfish. That was my first time to see one in practice and learn the concepts behind it. I would love to see more on these techniques.
I recommend Simon's video "how not to cheat at sudoku" with the puzzle called Tattooine Sunset. That's what helped me to understand a swordfish.