Life-Changing Sudoku Hacks

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▶ SIMON'S HACK FOR HARD CLASSIC SUDOKU◀
You can find Simon's solve of Thomas Snyder's "Gridlocked" hard classic sudoku (which Mark showcased on the channel a few days ago) on Patreon now:
/ crackingthecryptic
*********************************************************************
Today's puzzle is a classic sudoku by jovi-al - the constructor who made a video for us last Sunday showcasing how to create a sudoku. This is a really really good puzzle and you can try it at the link below:
app.crackingthecryptic.com/su...
Rules:
Normal sudoku rules apply.
▶ SIMON VS PHISTOMEFEL ◀
If you'd like to try the Phistomefel's Yin-Yang Fillomino, you can play it here:
app.crackingthecryptic.com/su...
Rules and example puzzle can be found here:
logic-masters.de/Raetselporta...
A (long) video of Simon doing battle with this puzzle is out now on Patreon.
Please follow us on Twitter: @crypticcracking
**************************************************************
▶ OUR NEW KILLER SUDOKU APP IS OUT ON ALL PLATFORMS◀
apps.apple.com/us/app/killer-...
store.steampowered.com/app/14...
play.google.com/store/apps/de...
▶ SIMON REACTION BOARD (!) ◀
With thanks to Andrea for creating this :)
simonreacts.avris.it/
▶ OUR MIRACLE SUDOKU APP IS OUT ◀
Steam: store.steampowered.com/app/13...
App Store: apps.apple.com/us/app/id15273...
Android: play.google.com/store/apps/de...
▶ CTC FAN DISCORD SERVER◀
/ discord
NEW: Guide To Our Discord Server:
tinyurl.com/CTCDiscordGuide
▶ OUR BACK CATALOGUE - ALL CATEGORISED WITH LINKS!◀
tinyurl.com/CTCCatalogue
▶ OUR NEW THERMO SUDOKU APP IS OUT!◀
AppStore: apps.apple.com/us/app/thermo-...
Android: play.google.com/store/apps/de...
Steam: store.steampowered.com/app/13...
▶ NEW CRACKING THE CRYPTIC MERCHANDISE◀
teespring.com/en-GB/stores/cr...
▶ OUR CHESS SUDOKU APP IS NOW OUT!◀
AppStore: apps.apple.com/us/app/chess-s...
Steam: store.steampowered.com/app/12...
Android: play.google.com/store/apps/de...
▶TRY OUR CLASSIC SUDOKU APP◀
AppStore: apps.apple.com/us/app/classic...
Steam: store.steampowered.com/app/11...
Android: play.google.com/store/apps/de...
▶TRY OUR SANDWICH SUDOKU APP◀
AppStore: apps.apple.com/us/app/sandwic...
Steam: store.steampowered.com/app/11...
Android: play.google.com/store/apps/de...
▶SEND US PUZZLES TO SOLVE/CONTACT US◀
crackingthecryptic@gmail.com
▶FOLLOW US◀
Twitter: #crypticcracking
@crypticcracking
Instagram (for how to solve daily clues from The Times): crackingthe...
▶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!
▶Logo Design◀
Melvyn Mainini
▶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

Опубликовано:

30 мар 2021

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Комментарии : 332

@tombuckles6985 3 года назад

Thank you, Simon. That made my day!

@TarbenXsi 3 года назад

Speedy recovery to you, Tom!

@kasperlinddal7525 3 года назад

Best wishes Tom

@tombuckles6985 3 года назад

@@TarbenXsi Thank you.

@tombuckles6985 3 года назад

@@TarbenXsi Thank You

@tombuckles6985 3 года назад

@@kasperlinddal7525 Thank you!

@heathermichaelson3526 3 года назад

Who else was crying over Tom's amazing letter? Keep going Tom! You got this!

@OyvindSOyvindS 3 года назад

Me too

@tombuckles6985 3 года назад

Thank you Heather

@Arcessitor 3 года назад

@@tombuckles6985 Wish you all the best! My grandpa suffered the same thing but he made a recovery to the point he could do everything again.

@tombuckles6985 3 года назад

@@Arcessitor Thank you. That is my goal and it is folks like your grandpa who are my inspiration

@jovi_al 3 года назад

Thank you so much once again! I was not expecting this classic to get featured :) SPOILERS FOR THE SOLVE: This technique is called a W-wing, and after it was explained to me by the brilliant Shye, I wanted to make a classic that "teaches" it. I've got two more in this series and I really hope to make more!

@Sujisan4 3 года назад

Another absolutely beautiful puzzle. Keep making these stunning works of art

@tabularasa0606 3 года назад

Thanks for this, learned something new!

@t71024 3 года назад

Thank you, brilliant puzzle! I'm so glad I found the W-wing (though I didn't know it's name) and was able to figure out how to use it. If it had been buried in the middle of the puzzle, I probably wouldn't have spotted it.

@jovi_al 3 года назад

@@t71024 thanks for the solve, the idea was to make it as easy to spot as possible :)

@jovi_al 3 года назад

@@Sujisan4 thank you so much :)

@rustybarrel516 3 года назад

When you’ve been solving so many jazzed up puzzles that you say “by sudoku”... when solving a classic sudoku.

@nicocost33 3 года назад

Three thumbs up for Tom, Mark and Simon. And a lot more for all the creators and creation itself.

@pthelynese 3 года назад

You have a lot of thumbs!

@Samish30 3 года назад

22:38 at the bobbins moment the easier way to crack the puzzle open was looking for the possible positions of 2 in box 7, which are both in row 8.

@KingoftheJuice18 3 года назад

When you come expecting to hear some more enjoyable and relaxing sudoku talk, and then you have your eyes melted by a fan letter....Honorary title for the channel today: "Cracking the Heartstrings."

@Kaschu74 3 года назад

As my wife suffered her second stroke in september, I can only wish Tom all the best. My advice for him is: be patient! My wife's rehabilitation took two years after the first stroke and is still ongoing after the second one. Simon, thanks for sharing the story.

@tombuckles6985 3 года назад

Thanks Kaschu. I am in acute Physical Therapy and my progress in so short a time has been entirely unexpected. I am being realistic about my recovery but am very optimistic

@richardcranium0 3 года назад

The 1,2 pairs in the extreme corners connected on 1s in r5 is a W-Wing - but I kinda like the new named Simon has bestowed, the "crankshaft"... ;)

@nishanthn4927 3 года назад

Old machine makes you look younger!!

@user-nz4hs1wx1l 3 года назад

He is 25 years old

@iliaschakour3171 3 года назад

@@user-nz4hs1wx1l 25 yo season 2

@shye229 3 года назад

yay!! i was hoping you would cover this classic! the technique in question is called a w-wing, and its an underrated technique i think. this is one of my fav classics, a lot for how well it telegraphs it, you could show this to someone whose never seen the pattern before to teach them it

@wordling720 3 года назад

I am weeping! Wow! Best of luck to you, Tom, and thank you to Simon and Mark!

@tombuckles6985 3 года назад

Thank you Melissa

@mwward 3 года назад

I'm pretty sure if Simon is doing a classic then it's required for him to say "by Sudoku" for every single digit entered

@nochsta 3 года назад

I always like to imagine it as a swear. “This must be a 3? By Sudoku!”

@FryGuy1013 3 года назад

I managed to complete this one in under 21 minutes. It's always a joy of my day if I can beat Simon's time even with the advantage of him having to explain things. You don't really need the X-wing as the "crankshaft" works by just considering implications of 1 placement through boxes 4/6. I did another classic sudoku with the same trick, and am always alert now when I see the same pair in opposite corners. That was the only real trick of the puzzle, but still hidden with a combination of naked and hidden singles so lots of fun!

@deanwalker6251 3 года назад

All the best Tom for a full and speedy recovery... On the video Simon, I thought the sound quality was fine and I prefer the this camera angle

@markschneider623 3 года назад

The audio was unusually crisp on this solve. And I think I like the camera position better than perched high above your monitor.

@nigelm5777 3 года назад

This is a much better camera angle.

@Leyrann 3 года назад

I have to admit, I prefer the usual camera angle.

@treasureboxgaming7109 3 года назад

I work on the puzzles prior to watching the video and if I get stuck, I watch the video to help me out a bit. The falcon wing 6 breakthrough in R5C7 was what I needed to solve the puzzle. I didn't know how to use the xwing information before now. Thanks for the video!

@user-wd8up4cv3g 3 года назад

The trick with corners (there can't be two 1s, so other two corners are not 2) was fantastic to me. Thank you for posting!

@user-wd8up4cv3g 3 года назад

And that let me not use Xwing on 3s, just all the puzzle was simply done after that

@user-wd8up4cv3g 3 года назад

Watched through the end. The 198 trick was nice, I have cracked with the idea that 2 in box 7 goes in row 8, so r8c9 is 3 and so on

@wossaaaat 3 года назад

Mental how quick you saw that 'crankshaft' thing. But I think seeing what the 4 did to 2s in box 7 was a bit easier than that hidden triple. Great solve.

@lroke2947 3 года назад

Indeed! The crankshaft was life-changing as promised. But the hidden triple was a stretch compared to the question "Where does 2 go in box 7 now?"

@seppeseghers3851 3 года назад

Great video guys, keep solving life one cell at a time. And Tom, wishing you a speedy recovery mate.

@Michaelartzer 3 года назад

An incredible story. Absolutely love it.

@cmonkey63 3 года назад

What a cracking puzzle! And two new insights for future solves.

@VSO_Gun_Channel 3 года назад

Wow. That’s a great story. I had never messed with sudoku before CC. I always saw it as that weird number game. Then I found you guys a little more than a year ago.

@micahhenry 3 года назад

Miracle sudokus from Simon and Mark everyday. Make it happen, Tom! Cheers, you amazing kids!

@lynseymoffat2338 3 года назад

Tom, wishing you all the best for your continued recovery. How heartening to hear the rapid progress you have already made.

@Canadoscope 3 года назад

instead of the complex times trick that Simon saw at 24:10. I found the 2 in r5c2 was locking a 2 in box 7 in only row 8, thus making r8c9 a 3 and doing the unfolding of all those digits just like that trick did. :)

@siorac1147 3 года назад

Wanted to comment the same thing. At the same time, I like it when Simon shows me something that I never would have spotted on my own.

@Canadoscope 3 года назад

@@siorac1147 i agree, i love being shown new logic i can use if im ever stuck on a puzzle i can try and search with these new tricks!

@gms8994 3 года назад

I didn't realize when watching a Simon solve that I would need a permission slip for a feels trip! What a letter!

@tombuckles6985 3 года назад

HA! Feels trip! I love it!

@Zahack1 3 года назад

I never comment but watch your videos every day. Today’s story got me very choked up. Your videos bring me joy, but to hear that they are helping Tom in his recovery is beyond special! Keep up the great work and if Tom ever see this message, thank you for sharing your story and best wishes on your recovery!

@tombuckles6985 3 года назад

Thank you Marc. CTC videos have helped me recover the ability to make sense of a map. the keyboard on which I am writing this, the calendar. the touch pad on my phone, the list goes on

@MarcMcMillin 3 года назад

I was very moved by Tom's letter. Keep it going Tom!!!

@tombuckles6985 3 года назад

Thank you Mark. The CTC community is a very kind group

@bartw8523 3 года назад

Super that you red the of Tom. I wish him a good recovery with the sudoku's of cracking the cryptic. And it's a lovely classic sudoku. 👌🏻☀️😃

@tombuckles6985 3 года назад

Thanks Bart!

@eliaskar5084 3 года назад

I literally shed a tear with the e-mail. Best wishes, Tom, and thanks again to CtC for everything they've provided us with during such a tough year!

@tombuckles6985 3 года назад

Thanks Elias

@ThisIsScorefun 3 года назад

Windows 7 in 2021 ? - That's real Cryptic...:)

@Blindpig14 3 года назад

Thank you for this video! As a beginner, this is quite helpful!

@blcmd 3 года назад

Great puzzle! I managed to catch the X-wing and the 12 and 13 pairs, neither of which I likely would have found it prior to watching this channel over the past year. I didn’t find the 189 without a nudge from the video, so I’m still learning. This channel has helped immensely in may ability to solve these puzzles.

@glennmelven3414 3 года назад

That was some neat logic with the 2s in the corners.

3 года назад

That's the stuff i would like to see more often, but i like your solves in movie format too!

@grahamrskelly6042 3 года назад

one of the best sudoku puzzlea, My favorite might still be a certain sunset but this was so great

@itamarolmert3549 3 года назад

36:58!!!! Still far more than Simon, but this is the first sudoku of this difficulty I've solved in less than an hour! It's clear I've been learning a lot from solving your sudokus. Thank you!

@ILikeEpicurus 3 года назад

Keep working on your laptop Simon, the sound quality is much better than on your Win7 (almost as ancient as Sudoku puzzles) desktop

@bobblebardsley 3 года назад

Took me 40:00 and a few seconds but I'm really pleased with that, I spotted some things in there that I would never have noticed even just a few months ago, I ground to a halt a few times but didn't need to guess or cheat by watching the video to find the next step. Really enjoyable puzzle too.

@ExodaCrown 3 года назад

Reading the comments saying what the technique is. It honestly looks interesting. Don't know if it ever popped up for me, but I will keep an eye out for it.

@shadowoftime3627 3 года назад

I liked the way you solved the x wing of 3's around 15:40. Though I solved it slightly different. In box 6 I found the 3 could not go in r5c9 because of the two 4 possible positions, the two 1 possible positions, and the two 6 possible positions. Basically since row 4 in box 6 had to have a 4 and row 5 had to have the 6, that meant that the 1 had to go with one and the 3 had to go with the other. Also since the 1 was closer to the end of the row, then the 3 would have to be before what ever number it was paired with. So for me I only had one spot for the 3 in column 9. But your way solved it with the x wing so was nice. :)

@liztaylor5714 3 года назад

Keep at it Tom - it’s hard work to get back from major strokes but the brain will keep reconnecting and you’ll make amazing progress - watch out for your balance though as that takes a long time to get back and it’s all too easy to have a nasty fall. A million thanks to Mark and Simon too for giving us such positive focuses and being so entertaining. All the best - Liz from Malta

@tombuckles6985 3 года назад

Thanks Liz. Balance is still shaky but improving daily

@Coyotek4 3 года назад

24:33 ... I got bogged down a bit, but it pleases me that I found the 'key' to the puzzle and never resorted to guesswork. Nice classic!

@timmccaskey 3 года назад

Thanks for sharing Tom's story, and the puzzle. I did it in 33:42, and it wasn't pretty - had a hard time finding a particular single, then bifurcated, but discovered my first guess was wrong after a LONG time, then got it. Now to see what I missed...

@timmccaskey 3 года назад

The answer is a lot of things. The x-wing on threes, the corner trick with the 1s...

@robinbaich169 3 года назад

Thank you for sharing the letter. God bless Mr. Buckles and CTC.

@pthelynese 3 года назад

To be honest, the audio and video look great!

@russellbarnett7606 3 года назад

The most staggeringly useful sudoku hack I’ve learned from this channel is that if you add the numbers together in a sudoku box, column, or row, they add to 45 🤯

@michaelhoffman2011 3 года назад

That was fun... took me 15 mins... I think I have been watching CTC for a bit now so thought i would make the corners and that was a great place to start. great way to start just before easter

@spandanbhattacharya5030 3 года назад

Loved the letter!! Luckily I was able to solve this one without the crankshaft thing but i learned a good tool to use in other hard classics.

@EllaABo 3 года назад

9 minutes 20 for jovi-al's puzzle, on mobile even. I think that's a record for me! Seems like the classic sudoku practice I've been doing is paying off. I found the puzzle very approachable.

@williamgreer7601 3 года назад

13:27 for me and a few what if's but no bifurcation. I liked how the rid got about 2/3rds filled and stalled for a bit (atleast for me) before picking up speed rapidly

@stevesebzda570 3 года назад

A very nice story at the beginning. Yes, very very nice.

@sallycarroll6329 3 года назад

Excellent

@laszloliptak611 3 года назад

Very nice puzzle. Solved it in 26:15. At 24:00 an easier way to finish the puzzle is to notice that the 2 in r5c2 forces a 2 into row 8 in box 7, which gives a 3 in cell r8c9, after which the puzzle is easily solved. Recently I have been using a technique to "find a broken path" method, in which I am looking for two cells with the property that one of them must contain the same particular digit. If I find two such cells, then any cell seeing both must not have that digit. This helped me on this puzzle as well (after finding the X-wing on 3s). For this method I consider only cells that only have two candidates remaining and look for two of them in the same row or column or box that share a digit. The nonshared digit gives me a pair of possibilities meaning that at least one of the cells must be that digit. Then I look for other cells with exactly two candidates that see one of these cells and share the digit. Then I switch to that cell and the nonshared digit in that cell and continue until I find a pair with the same digits. If I can't, try another pair. In this puzzle at 17:14 one can find what Simon noticed as follows: Start with cells r5c9 and r9c9, which share a 1, so this is a 3-2 pair (meaning that either r5c9 is 3 or r9c9 is 2). If I see a 3-2 pair seeing either of these cells, I would find my goal. Seeing none, but noticing the 13 pair in r5c1, now we have a 1-2 pair for r5c1and r9c9 (meaning that either r5c1 is 1 or r9c9 is 2). At this point I am looking for a 1-2 pair that sees r5c1, which is in r1c1. This gives the 2-2 pair for r1c1 and r9c9 just like Simon found, eliminating the 2 from both r1c9 and r9c1.

@NettoTakashi 3 года назад

25:00 I found a different path to continue from this point. Rather than spotting the 189 hidden triple, I asked the question: "where can the 2 go in box 7?" Both possibilities were in row 8. That means r8c9 cannot be a 2, so it must be a 3, which quickly feeds back through the "crankshaft" to give much of the same information the 7 gave Simon.

@Kelters 3 года назад

If you can log in, you should check your ram memory cards before paying out more money than needed. Best of luck, and thanks for getting the video done despite the problems! :) -- Same solve time as Simon. Wow! Mind you, I wasn't explaining the logic steps as I went along.

@vinceocchipinti4087 3 года назад

Hi Simon, I just had the same problem with my Windows 7 computer. I believe it did a critical upgrade, which for some reason messed everything up. I was told to do a restore to an earlier point, which has resolved my problem. Good luck.

@finbarrhayes5878 3 года назад

Fantastic

@michielgerretzen9777 3 года назад

Crankshaft and NT trick (box 7) forcing a triple in row 8. Lovely!

@victordias8899 3 года назад

Simon, @ around 23:00 minutes mark the 2 on box 4 forces the 2 to be on a straight line on box 7! Then that removes the two on the last column, which resolves the 2 on the bottom right corner and, after that, the puzzle cracks open!! Anyway, great solve as always!

@RenanLeandroFerreira 3 года назад

Finally one sudoku that i can solve on my own!!!

@lizbrooker4635 3 года назад

I love Tom’s story. Good luck to him. I also prefer you on the laptop! Don’t underestimate the well- being effect of CTC. My appreciation stretches all the way to 3 in the corner 😉

@richardcranium0 3 года назад

a treble Bobbins?!? lol, brilliant!

@matthewcunningham2278 3 года назад

Very fun puzzle solved it in about 30 minutes

@mickeyjupp1 3 года назад

Simon is a star.

@MisterM2402 3 года назад

I managed it in 12:58 and I don't understand how. I'm usually double or triple Simon's/Mark's time (or just don't finish at all) so I'm super happy and confused at the same time! I think the corner logic was similar to another recent sudoku so I remembered it quite quickly.

@Radinden 3 года назад

I'm not sure how I managed 17:57, but it was a lovely puzzle: the logic at the corners was very elegant.

@victorfinberg8595 3 года назад

A good way to make progress after finding the 4 in r1c9 is to look at the effect the box 4 2 has on box 7. The fact that such things exist suggests that it would be useful to switch to basic scanning mode frequently after making any progress.

@Bl4ckl10n43 3 года назад

Has a Channel with more than 300.000 subscribers. Still uses Win7... You mister, are a real hero.

@charlesxaqairy709 3 года назад

Huzzah!!! I finally managed to solve one! Granted, I paused my solve at ~20min and watched Simon's solve up to 13:00 until he mentioned the 5 being a naked single. I didn't catch it at first, but I did it! 43:21, +~20 minutes because I restarted a couple times.

@charlesxaqairy709 3 года назад

I definitely didn't use any techniques, tho. DX I brute forced it by figuring out how the pairs interacted around the board.

@Gravi66 3 года назад

At 23:30 i spotted a XY-Wing instead of your 189-row 8 step. It is 37 in r7c2, 27 in r8c3 and 23 in r8c9. All fields that the 37 and 23 BOTH can see cannot be 3 because we couldn't fill in anything into r8c3. So r8c12 cannot be 3 so the 3 in box 7 must be in r7c2. Also the technique that Simon was using at around 18:30 is called W-Wing.

@megaminxpll 3 года назад

It's called a W-wing and is there from the start even. After that it's a very easy puzzle.

@charliegrant5061 3 года назад

Tom: Human brains are truly amazing - and it appears that yours is especially so. I hope your recovery continues, at whatever pace. Please send us an update down the line (via Simon & Mark).

@tombuckles6985 3 года назад

Thank you Charlie. The brain's resilience is something I'm experiencing every day

@susanne5803 3 года назад

@@tombuckles6985 Wishing you all the best! Stay safe!

@FullPwned 3 года назад

I love when Simon uses randomly some numbers and guess it correctly. It was 6 or 7 in r7c5

@glennmelven3414 3 года назад

It was a naked single. The 7 was already placed in R6 C5 and the only 3 numbers left in C5 were 169 and R7 had give 18s. No guess at all.

@undergroundmonorail 3 года назад

@@glennmelven3414 they mean right at the beginning when simon was explaining how the notation he uses works he put 67 center pencil marks in that square as an example

@gregs2284 3 года назад

Apparently it's called an XY-Chain -- which I've never come across before. It's considered "harder" than a WXYZ-Wing which is about where I gave up learning new techniques. My problem is that everyone teaches you the patterns but not any techniques for spotting them.

@jovi_al 3 года назад

Without the X-wing on 3s (which is not mandatory) it's a W-wing, but because r5c1 and r5c9 happened to be bivalue because of the X-wing, it becomes an XY-Chain. I did not put that X-wing out in the open, so if you didn't find it, you could still get the 4 and 6 in the corners via the W-wing :)

@RoderickEtheria 3 года назад

23:37, because I had insights along the way. I hadn't watched Simon perform the puzzle more than I already had at any point. One insight I had was asking can both the top left and the bottom right corner of the puzzle be 1? The answer based on row 5 is no, which revealed at least one of the two corners contained a 2, which revealed the other corners to be a 4 and a 6. This made me entirely miss the 3 x-wing, and the 6 being revealed by that x-wing was actually unnecessary for my purposes.

@abhijittapadar1813 3 года назад

Very exited as I solve it faster than simon1st time .. then realised he also explains during solve.. better luck next time..

@Stratelier 3 года назад

Similar case here, I made a mistake 10m and had to completely restart.

@_mnejing 3 года назад

When you mentioned the corners were probably weak, you were right. It didn't change much in the solve for me, but there was an X-Wing in the corners on 2s. Wasn't as useful as the 3 X-Wing, but it was there regardless. Edit: Upon finishing the video, I realized the latter half of the solve, after the W-Wing, would have been quite a bit faster if you had noticed the 2 X-Wing.

@qazwiz 3 года назад

INSTEAD OF CRANKSHAFT which implies the non-aligned pieces go different directions, (not to mention wide split between the aligned pair) I suggest calling it a broken wing (as in, a broken X-wing) defining it as "an aligned a-b pair and an unaligned b-c pair that at a right angle aligns to both" AND THE SIGNIFICANCE BEING that the "b" (in this puzzle 1-1) cannot be on both unaligned pairs but it may be c-c (2-2 as happened) OR b-c (1-2 / 2-1 the other possibilities)

@leickrobinson5186 3 года назад

The sound seems a lot better on this machine, too! :-D

@haileystone330 3 года назад

I'm always so excited when I spot something before Simon, but today I spot something he never saw. The 3 that he got from the 189 logic to get the 7 and finally the 3 and led him to solve the entire thing in only a couple minutes could've been found quite a few minutes previous through using the side wings logic. Nothing big, just thought I'd point it out :)

@DaShikuXI 3 года назад

I usually go through the digits 1-9 one by one, getting as many pencil marks and digits as possible using the Snyder notation. After going through the digits the grid has or course changed so i go through the digits again. I keep cycling through until i can't make any more progress in this way. Then i switch to looking at each individual box and getting pencil marks in those. After that rows and columns. Then i go back through cycling through the digits again. I can complete most classic sudokus this way relatively quickly (besides the handcrafted ones that need specific techniques).

@steviedmrbk5179 3 года назад

I quite like the laptop face view, the sound is fine too...actually better than Mark's which I find quite echoey

@davidh.4944 3 года назад

It took me an embarrassingly long 93 minutes. I half-noted the w-wing pattern fairly early on, but at that point I was thinking that the corners would have to be opposite digits to be useful, and moved on when I couldn't immediately determine that. I subsequently wasted a lot of time on other fruitless hunts, before finally coming back to it, at which point I recognized that there was always at least a 2 there. The second big time-eater was how long it took me to locate the hidden 2357 quad in row 8, and its inverse triple, which led the final solution. A good puzzle, overall, but definitely not a push-over.

@christianmcneill699 3 года назад

Rather than using the "times trick" to get the 7 in Box 8. I noticed that there is an x-wing on 2's between Box 3 & box 6 as 2 can only appear in column 7 & 8. This ruled out 2 in column 8 in Box 9. That's what broke the rest of the puzzle for me.

@oulajp 3 года назад

2's in box 7 can only be at r8c1 and r8c3 at that point, and that rules out 2 in r8c9. That's what cracked it for me.

@mollberg3501 3 года назад

I'm still using Windows 7 on my desktop. I usually don't have any problems but whenever I've had any issues, a little program I got from Bleeping computer has saved my day: combofix. It just seems to work wonders. So if all else fails you might wanna give it a try.

@Mogwat 3 года назад

YES YES YES -----GOD HOW I LOVE SUDOKU

@adrianhead6272 3 года назад

Completed in 11m41s - very straightforward

@bakajiji 3 года назад

I managed this in 22:07 without any fancy techniques. I amazed myself!

@serkanergun0 3 года назад

There was an easier deduction at @23:56 2 can only go to row 8 on box 7, ruling out 2 on r8c9

@Tombsar 3 года назад

24 minutes here. Good puzzle! Not sure I spotted the "W-wing" people are talking about in the comments (haven't watched the video yet), but I did use a combination of X-wing and good old "if this then that, else that then this, so this cell is always 4".

@57thorns 3 года назад

17:13 I managed a Sword fish variant on 3s involving four rows and columns that eliminated that 3. After that I saw the xwing.

@ceevio_art 3 года назад

Good spot! A 4 row/column variant of the swordfish is called a' jellyfish'. You'll often find that if there's an x wing in 2 rows, it often corresponds with a sword fish or jellyfish in the alternate columns, (and vice versa), acting on the same cell like it did here.

@richfiles 3 года назад

I almost never do Sudoku puzzles... I don't have a lot of practice, but my mother does them all the time. decided to play along on this one. Do a bit, play to see if I went in the same logical direction, and pause again, to try and figure out the next bit. had to backtrack once due to an error, and I had to replay it a couple times to really get the whole crankshaft bit, but I did it! Took me an _abysmal_ 107 minutes, but hey, I couldn't tell you what *_year_* I last did even an easy Sudoku, much less a stumper like this! I'll take 107! :P

@DonnyTheNerdfighter 3 года назад

@24:00 when Simon points out the 9/1/8 triangle in box 7 there is another way to go.. In box 4 the 2 in c2 locks 2s into r8, making r8c9 a naked single 3.

@PauxloE 3 года назад

Looks like your app recently changed the position of the corner marks to be less in the corner? (Or just on your laptop you forgot to activate the large digit mode?) I guess that helps to not overlap the corner Killer Sudoku clues, but here it looks like a lot of wasted space, and almost overlapping the center clues.

@l3igl2eaper 2 года назад

At 24:00, a much simpler deduction can be made without using New York Times puzzle magic. You ask where the 2 goes in Box 7 and what that means for the rest of the puzzle.

@AngelzWrath11 3 года назад

I managed to solve it without using that NY Times 1-8-9 trick that Simon used. I noticed that the 2 in column 9 could only go in box 9. That meant there could be no 2 in R7C7, which meant the only places for 2's in R7 was in box 8. Which meant R9C6 could not be a 2 and had to be a 9. And from there the puzzle broke open in a very similar way

@pietndala7394 3 года назад

At 24:04 the New York time trick was not necessary...2 in row 5, meant 2 could be in column 1 or 3 in row 8, thereby eliminating a 2 in a 23 pair in column 9, thus leaving a 3.