This Sudoku Actually Teaches The X-Wing Technique!

Рет қаралды 138,862

3 жыл бұрын

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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

Пікірлер: 332

@blueberrypieology3088 3 жыл бұрын

For beginners like me it’s very educational that you put in a video like this occasionally. Thank you!

@Rubrickety 3 жыл бұрын

"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.

@88marome 3 жыл бұрын

Haha! Totally!

@matthewender3473 3 жыл бұрын

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.

@swaggleboon 3 жыл бұрын

"They should use this puzzle to teach the X-wing in Sudoku School!" I'm pretty sure you just did ;)

@davidbeaumier4953 3 жыл бұрын

Wait, there's a sudoku school ???

@davidbeaumier4953 3 жыл бұрын

@@KonosubaMegumeme i'm screwed :'( lol

@IcecalGamer 3 жыл бұрын

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

@charleswoods7276 2 жыл бұрын

Andrei-Razvan Tutuianu p

@darthscorn1 3 жыл бұрын

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.

@necaton 3 жыл бұрын

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.

@Just2Dimes 3 жыл бұрын

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.

@Mephistahpheles 3 жыл бұрын

@@necaton Agreed. Spotting them is definitely the hard part. (In particular useful ones.)

@Lauren-hinrichsen 3 жыл бұрын

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

@richalsop 3 жыл бұрын

"We cannot place the same digit more than once in a row, column or box for very obvious reasons"

@MyNarsa 3 жыл бұрын

"we can't place 0 into the grid, well we can since I'm in the new software"

@Bin216 3 жыл бұрын

Schrödinger cells are not allowed (on this channel)

@ceevio_art 3 жыл бұрын

"Bobbins" is the family-friendly substitute for "bollocks".

@michaeljarcher 3 жыл бұрын

"Let's get Cracking" is not prison Lingo, but the other way to stimulate your mind with puzzle logic.

@edkillworth 3 жыл бұрын

After spending 30 minutes looking for X wings and getting nowhere I managed to find some cake for the rest of the video.

@bluerizlagirl 3 жыл бұрын

There's another solution involving a bunch of 4-8-9 triples and subsets thereof.

@11mandylion 3 жыл бұрын

Space cake is the best solution for all sudokus

@mikepictor 3 жыл бұрын

@annmariedavis4 Жыл бұрын

It's breathtaking!

@xaostek 3 жыл бұрын

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...

@S_Black 3 жыл бұрын

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

@rogerstone3068 3 жыл бұрын

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...

@t71024 3 жыл бұрын

Brilliant symbolism to use the digit 4 for an X-wing and 9 for the swordfish!

@timbates6309 3 жыл бұрын

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.

@MrCharlieArgo 3 жыл бұрын

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

@Kuraudo_VII 3 жыл бұрын

Exactly how I felt.

@FirstLast-gw5mg 3 жыл бұрын

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.

@diebekiffteblaueraupe6489 3 жыл бұрын

Yes, so I saw the title and I was like mhh I might need X-wings but I didn’t found a single one

@vadermike7772 3 жыл бұрын

8:54 "This makes you feel like the Universe is in order" LMAO this was a great quote!

@aloofmeatloaf1467 3 жыл бұрын

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!

@chadbentley4008 3 жыл бұрын

*Sudoku puzzle exists* Simon: Uh, this puzzle is just beautiful.

3 жыл бұрын

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.

@wilde1909 3 жыл бұрын

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.

@Derrad 3 жыл бұрын

The most simple puzzle you solved but it's the one that taught me the most , thank you i love your videos

@starryskies624 3 жыл бұрын

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!

@FirstLast-gw5mg 3 жыл бұрын

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.

@dmurky 3 жыл бұрын

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 :)

@rosiefay7283 Жыл бұрын

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).

@guzsilva 10 ай бұрын

Yes I pretty much did the same solve as you, in 37minutes.

@aboorsa 3 жыл бұрын

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

@sKKynet 3 жыл бұрын

I'm finding myself solving sudokus hearing your voice in my head instead of mine!

@BozoTheBear 3 жыл бұрын

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!

@MyReligionIs2DoGood 3 жыл бұрын

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.

@ursulamoney203 3 жыл бұрын

THIS!! I never seem to manage to see the blummin' things :(

@theblackswan84 2 жыл бұрын

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 :)

@Tanfana830 3 жыл бұрын

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!

@pattystomper1 3 жыл бұрын

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?

@garanceadrosehn9691 3 жыл бұрын

Seems to me that this would be an excellent candidate for the book...

@Luna_Aberra 3 жыл бұрын

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

@sjamb0 3 жыл бұрын

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.

@jaymontana2708 2 жыл бұрын

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.

@violetcrumble57 2 ай бұрын

Sudoku being described as "Beautiful" reminds me of Steve Irwin describing crocs as "Gorgeous"

@lingua83 3 жыл бұрын

I love your appreciation for the puzzles people send to you ❤️

@PaulRump 2 ай бұрын

This sudoku is an excellent example of the use of Set Equivalence Theory. After the initial filling, we arrive at (6 minutes into the video) the actual starting point. Now, we colour the 1st, 4nd and 7th column blue and the 3rd, 4th and 9th row yellow. Both, Yellow and Blue contain three sets of the digits 1 to 9. Stripping away the mutual cells and cell with the same value, we arrive the difference in filling (unknown cells indicated by x): Yellow: 56677x Blue: 4xxxxx This implies that the Yellow x = 4 -> d8 = 4 It also implies that the five Blue unknown cells contain 56677. Having 5’s in b7 and i3 and a 6 in i9, these can easily be resolved: h7 = 7, h1 = 6, h4 = 5, e7 = 6 and e4 = 7. This is just too fantastic to be coincidental! The question is: what had the author in mind, an X-wing/Swordfish demonstration or a display of Set Equivalence Theory?

@berniehewett 3 жыл бұрын

Over the last couple of weeks I have really appreciated your videos as I begin trying to tackle more challenging sudoku's.

@tacocat1705 3 жыл бұрын

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

@aWOKEn1445 2 жыл бұрын

8:55 a transcendent moment in Suduko. Now I see why people love it so much!

@silvereyes92 3 жыл бұрын

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 :)

@GabeWeymouth 3 жыл бұрын

This was really helpful. Great teaching and great puzzle.

@AaronPriceColby 3 жыл бұрын

Thank you for breaking down the x-wing technique, I've always been a little confused by it.

@stevieinselby 3 жыл бұрын

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.

@rwind656 3 жыл бұрын

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.

@paulcook2961 3 жыл бұрын

The universe is in order. There is some purple behind everything.

@williammoore7268 3 жыл бұрын

Yes, finding the "purple" behind everything is awesome!

@ThatGuy-dj3qr 3 жыл бұрын

Wonderful progression with your solve Simon. Excellent execution!

@telduf1 Жыл бұрын

Brilliant - thanks Sam for design and Simon for explanation.

@filmcamera 3 жыл бұрын

Great puzzle, I was led into the same solve path as you, Sam holding my hand and guiding me along the whole time!

@jt3guitar 3 жыл бұрын

Had a breakthrough thanks to this video! More sudoku than ever are within my humble reach. Thank you, Simon sensei!!

@1002l 3 жыл бұрын

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!

@ivan_osorio 3 жыл бұрын

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.

@JPgreekgaming 3 жыл бұрын

I feel this should be in the book (or any sudoku book) as a practice piece even for advance solvers! That was wonderful!

@brikselbroksel5573 3 жыл бұрын

Love your enthusiasm!

@springboard9642 3 жыл бұрын

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.

@PhreshSpice 3 жыл бұрын

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!

@elixabethclairec 2 жыл бұрын

These videos are helping me SO much, I really appreciate your explanations!

@solfeinberg437 2 жыл бұрын

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.

@perritohiker 3 жыл бұрын

Your enthusiasm is contagious!

@williamlugar9938 2 жыл бұрын

Thanks, Sam couldn’t have explained it any better!

@Moksoory1 3 жыл бұрын

You destroyed that puzzle's defenses. Well done.

@chris_rafan5909 3 жыл бұрын

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 :)

@jand147 2 жыл бұрын

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.

@mikkomannonen2331 2 жыл бұрын

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 :).

@jackieenois 3 жыл бұрын

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.

@fuegoisfire1 3 жыл бұрын

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.

@KDbelieves 3 жыл бұрын

Yes this was actually really helpful. I finally understand the X wing perfectly.

@ulisesespejovigil27 2 жыл бұрын

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!

@_mnejing 3 жыл бұрын

I didn't get the swordfish until after. If you miss or ignore it, there's technically an X-wing on 7s (R6C5, R6C9, R7C5, R7C9). It ultimately lead the to same logic Simon used by giving me enough 7s to resolve column 8. It doesn't mess the swordfish logic up, and it's still useful afterwards (I needed it to finish). Long story short, there's a 3rd X-Wing that's a bit hidden if you find the swordfish first.

@rosiefay7283 Жыл бұрын

Thank you for this sudoku. It served as a nice test example for the X-Wing part of my solver.

@kuraban1 3 жыл бұрын

Woo! New software! Worked perfectly. 17:02. Got fooled by the title on the video and kept looking for x-wing, not swordfish! D'oh!

@timscratcherd Жыл бұрын

Superb thank you

@macCALICOmac 3 жыл бұрын

This was awesome thank you!

@josephcredendino2899 3 жыл бұрын

finally i have a puzzle that perfectly illustrates the swordfish technique this is amazing thank you

@map-reduce 3 жыл бұрын

Best explanation of the logic of x-wings and swordfishes I've ever seen. Bookmarking this!

@alvaropallete 3 жыл бұрын

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

@mathfincoding 3 жыл бұрын

I wish the X-wing wasn't in the title, because when I attempted the puzzle myself, I immediately hunted for X-wings (after filling in all the 1s, 2s, and 3s). But I completely understand why they did it. But Simon is right--this was an extremely fun solve.

@bristolrovers27 3 жыл бұрын

Brilliant puzzle

@coyote4237 3 жыл бұрын

Great video, thank you.

@patricialorenzo1474 3 жыл бұрын

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.

@robingrimm3443 3 жыл бұрын

Amusingly I started this puzzle, got stumped because I couldn't find the x-wings, watched the video to the point Simon found the swordfish, said "ah that's how you do it", went back to the puzzle and immediately forgot how to solve it. I'm still proud of my ~20 min time anyway, even though a lot of it was just fiddling with number notation and backtracking XD

@AFastidiousCuber 3 жыл бұрын

I did it without the swordfish, but spotting that swordfish probably would have made it easier. I did it with four x-wings and a hidden pair: 1. After placing all the ones, twos, and threes, start with the x-wing on fours in r3c1, r3c7, r9c1, r9c7 2. That gives you the 4 in r4c7 and the x-wing on eights in r3c4, r3c7, r4c4, r4c7 3. After placing the eight and 5 in box 9 you get an x-wing on sevens in r6c5, r6c9, r7c5, r7c9, which completes column 8 and places 6s in boxes 2 and 3 4. The 6s in boxes 2 and 3 force an x-wing on sixes in r6c2, r6c6, r7c2, r7c6 5. Now, look at row possibilities for row 5; the 6 and 7 x-wings interact to force a 67 pair into row 5. This 67 pair eliminates 5 from r5c4, and forces 5 into r8c4. This places 6 in box 8 and resolves the 6 x-wing; the puzzle pretty much falls apart from this point.

@Kyufoxy 3 жыл бұрын

I did it without the Swordfish and without the X Wing (on purpose). Either I made a stupid mistake in between and it worked out... or Hidden Pair + Naked Single can solve the entire grid lol

@atimelord852 3 жыл бұрын

14:18 Brilliant puzzle!

@toukiliu7477 3 жыл бұрын

I wish to see more puzzles like this, to learn advanced sudoku techniques.

@yahoonomas 9 ай бұрын

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 :)

@yssubed2 3 жыл бұрын

28:35. And was able to spot the x-wing on 4s and swordfish. Great puzzle and highly instructive.

@bonedog5130 3 жыл бұрын

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!

@andres3725 8 ай бұрын

This was great 🙏💯

@wanderlustwarrior 3 жыл бұрын

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!

@wanderlustwarrior 2 жыл бұрын

Under 27:24 this time, after I forgot to pause when I went to do something else. Making progress, not using help!

@wanderlustwarrior 6 ай бұрын

20:56 this time. Slowed down a bit at the end because I kept hitting the wrong numbers.

@frederikjn 3 жыл бұрын

So pleased with myself - did this in 21:31. Definetely improving on spotting those X-wing/swordfish patterns.

@frederikjn 3 жыл бұрын

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

@yichen6313 3 жыл бұрын

Classics! It's a fun solve and not too difficult

@Coyotek4 3 жыл бұрын

22:25 ... but after finding three X-wings (including one on 7s), I caved and ended up bifurcating once to make it to the end. I still have much to learn. Nice puzzle. EDIT: I primed myself to find X-wings, and ended up missing the swordfish that would have let me finish this logically.

@humenbean 8 ай бұрын

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.

@charlottestang9462 3 жыл бұрын

I'm showing this video to my puzzle club at school to introduce them to advanced sudoku logic. Timing couldn't have been better

@rogerwilco2 3 жыл бұрын

5:09 is when I got stuck. You then explained it beautifully.

@NiklasIZ 3 жыл бұрын

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

@mariemasinova846 3 жыл бұрын

I spotted the pattern with the fours but I wasnt sure what to do with it. Thanks for explaining, it's really great technique!

@marsdenrhodri 3 жыл бұрын

It's been a while since we heard Simon say "Do NOT let your snake touch itself orthogonally", and I for one am having withdrawal symptoms.

@sircyrus00 3 жыл бұрын

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.

@domino3348 Жыл бұрын

Hi, excellent video ! What Sudoku software do you use in your video. Thank's. Best regards.

@fanyaugusts9760 3 жыл бұрын

Magnifico!!

@awilliams1701 3 жыл бұрын

I've been watching this channel for a month. I spotted things I never would have seen a month ago.

@johnestranger7618 3 жыл бұрын

Heh, i also coloured in the 4-X-Wing in green. :) There is actually another swordfish with sixes. You can spot it even before the 9-swordfish, for example at 4:20 of the video. It is not really helpful, but can you spot it anyway? Solution: Swordfish with sixes in columns 1, 4 and 7 (rows 4, 5 and 8). You can eliminate some sixes in rows 4, 5 and 8 but it won't get you anywhere.

@alanaquiggle8266 3 жыл бұрын

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!!

@UberHummus 3 жыл бұрын

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!!

@Kelters 3 жыл бұрын

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!).

@BryanLeeWilliams 3 жыл бұрын

48 minutes, but I kind of bifurcated. I found a y-wing. Then I tried to find another but, going down the path to find a contradiction ended up solving the puzzle. I think I found a jellyfish, a swordfish, 2 x-wings, and a y-wing. one of those x-wings might have been a swordfish or jellyfish. Can't remember now. At one point to was going so fast, I said, "slow down so you don't make a mistake. Then I realized that 3 digits back, I had made a mistake transposing two digits. Good thing I stopped to slow down. When I started filling in the puzzle, I thought we were being pranked with all the digits going in. This was an extremely satisfying puzzle to solve. Absolutely first class. A lot of tricks, but very approachable. I kept looking for a simple coloring (which is one of my favorite techniques) but never found one.

@juhaloukaja5078 3 жыл бұрын

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.