Think inside the Box for Once!

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Here's where you can play Think inside the Box by James Kopp: app.crackingthecryptic.com/48...
Normal sudoku rules apply. Adjacent digits along a green line have a difference of at least five. Box borders divide a blue line into segments with the same sum. Digits on the purple line must be a consecutive set of digits, in any order.
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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 crossword championship and twice Senior World Champion in Sudoku, 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!
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▶ Contents ◀
0:00 Theme Music & News around the channel
1:38 Rules of today’s puzzle
2:24 Start Of Solve - Let's Get Cracking!

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Опубликовано:

15 июн 2024

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Комментарии : 69

@kemokidding Месяц назад

Ironically, Mark didn't do enough pencil-marking. R2C2 and R2C4 are 23 if low. R2C6 is green and R4C8 is purple. So if purple is low, column 8 has 123, removing 23 from R2C8. If green is low, row 2 has 123, removing 23 from R2C8. Then R3C9 can't have six, pushing the 6 into R3C4.

@TheJuicyTangerine Месяц назад

that's how I got my breakthrough as well. The key was coloring r2c6 and r4c8.

@jameswilliams4985 Месяц назад

The other thing I think he missed is that R3C4 (and R4C3) couldn't be 3 or 4: -3 would have left only R3C9 available for both 4 and 6; -4 would have left the 6 having to go into R3C9, but would also put 1 and 3 onto the blue line in box 1, forcing you to put a 2 into R2C2 to make the German Whisper line work. That then takes the 2 out of R2C8, meaning that you can no longer make up the 1-2-6 in box 3. I have to say though, I do appreciate him publishing the video - it's vanishingly rare for me to finish a puzzle that he's struggled with, and it's oddly comforting to know that even someone on his level can get stuck sometimes.

@alanscott8245 Месяц назад

I got most of the additional coloring and pencil marking that Mark missed, but the 23 pairs pointing at R2C8 was the one thing I missed, and I ended up solving using a bifurcation that wasn't much different from Mark's.

@Paolo_De_Leva Месяц назад

The most important thing he missed is that this puzzle was *clearly* solvable with placeholder digits. He got bogged down by his intricate notation, which could have been *hugely* simplified with placeholders. This happened dozens of times in the past two years to both him and Simon. 👉 *Quasi-symmetric* placement of clues ==> placeholder digits are typically appliable. 👉 Puzzle mainly based on *whispers, renbans, nabners, entropic* or *modular lines...* ==> placeholder digits are typically appliable. This is true for any clue that does not "perceive" the difference between high and low polarity, i.e. any clue that is 100% compatible with the transformation: *y = 10 - x* See my separate comment for details.

@jameswilliams4985 Месяц назад

@@Paolo_De_Leva That sounds like it would work, but I actually think colouring the polarities was easier here. For instance, putting a placeholder "78" pair into either R2 or C8 wouldn't have shown as clearly that R2C8 could never be 2 or 3 in either version of the polarities, which seems to have been the crucial point that unlocked the solution for many of us. That is, if I've understood your method correctly anyway.

@bethanyhunt2704 Месяц назад

Why doesn't Mark colour the small green diamond?

@emilywilliams3237 Месяц назад

This was never going to be a puzzle that I would try, based on the video length. But then when I saw how impossible it was to get any traction, I knew that it was far out of my league. I am glad you solved it and persevered, Mark, and thank you for bringing us the video no matter how tough a puzzle.

@angec9908 Месяц назад

It’s so rare that I have to yell at Mark to check his sudoku 😂

@chocolateboy300 Месяц назад

I finished in 116 minutes. Not only did this puzzle look visually cool, but it was also a great solve. The way the different clues play with each other was very satisfying. I got stuck on the ending, but realized that 8 couldn't work in r3c5 due to breaking r2c2&4. It took me a while to finish, but it collapsed as soon as I ruled out 8. Great Puzzle!

@AlvinTOS Месяц назад

This one was a nightmare. Took me 170 minutes, it took a long time for me to eliminate the digits in the centre of box 3.

@alistairkeppler2225 Месяц назад

43:48. I don't normally attempt a puzzle if Mark and Simon take longer than an hour to do it. Somehow my brain clicked with this puzzle.

@richardfarrer5616 Месяц назад

If you continue the colouring, then it's clear that R2C6 and R5C8 are the opposite colour from the 8s near to them. Then either R2C2,4,6; or R4,6,8C8 are a 123 triple depending on which of purple and green is low. Either way R2C8 must be 4 or 6, so R1C7 and R3C9 are from 123, and you get a 46 on R2C2,4 and on R6,8C7. From there, the puzzle is fairly easy.

@pairot01 Месяц назад

You could have done so much more green/purple colouring

@ericpraline1302 Месяц назад

Very nicely engineered puzzle, thanks. Mark just needed to do a spot more colouring.

@frankjiang1857 Месяц назад

Finished in 40:26. Started it previously, but my brain wasn't working very well, then went to sleep and started over and finished it in about 14 minutes. Fun puzzle!

@calculatrguy Месяц назад

One of the hardest and most beautiful puzzles I have solved

@tedrinquest 29 дней назад

27:28 -- This is a first. I have never before finished a puzzle in less than twice Mark's time.

@gibbbon Месяц назад

i had started with the other 8-1 pair, then, seeing that all the 3 boxes digits resolved neatly, i erased all my pencilmarks, trying the same 8-1 pair you tried first, found out it didn't work, and had to go back to my deleted pencilmarks, thanks for the rewind function!

@jdyerjdyer Месяц назад

I'm surprised this took me less than half an hour! There really was only two ways the bottom section played out and one ruled out quickly leading to quick deductions to fill in the lines and then the rest of the grid! Thanks for a fun puzzle!

@marssang Месяц назад

Usually Mark beats me to nearly every logic, but there are two things here that are not hard to see that I saw. How could R3C4 ever be 3 or 4? If purple is small then you got too many small digits in box 1 (easy to see), and if green is small then row 2 would actually have 5(!!!!) digits from 123 (as 6 is pushed to R2C9, forcing R2C8 to be 1 or 2, along with R2C2, R2C3, R2C4, R2C6 all also being from 123). However the big deduction to help you break in here is that there is a virtual 123 triple looking at R2C8 in either scenario of polarity. If green is low its R2 (columns 2, 4 and 6) and if purple is low its C8 (rows 4, 6 and 8). That means R2C8 is 4 or 6 and thus R1C7 and R3C9 are both from 123, which forces 6's to the short region line and the renban (forcing the renban to now be 3456).

@MattYDdraig Месяц назад

37:08 A very neatly presented and clever puzzle. The 6s between the various diamonds caused all sorts of interesting havoc to break this open after a lot of pondering.

@karlmortenlunna2417 Месяц назад

16:16 for me. Nice puzzle!

@piarittersporn Месяц назад

Wonderful puzzle.

@fisharisticrat366 Месяц назад

22:12 Had fun with this one, straightforward

@NotVeryWilyCoyote Месяц назад

Colouring R2C6 and R4C8 were the key piece to making easier progress. It shows that R2C8 is 46, and then you need to put 4s and 6s in row 3 and column 7.

@IronLucario2012 Месяц назад

35:07 for me. It is a tremendous shame that you didn't just keep colouring and pencil-marking - R2C6 and R4C8 at least could have been coloured green and purple respectively the moment you realised they had to be both opposite R3C5 and R5C7 and not 5, and almost all of the coloured cells can then be played off each other based on considering the low and high possibilities for each cell with respect to what the other coloured cells have to be if they're the same or opposite kind - you end up with a R2 123 triple if green is low and a C8 123 triple if purple is low, forcing R2C8 to be the 4 or 6 in the 9-sum and forcing 6 into both the renban and the smaller sum, and it all unwinds very nicely from there!

@erickehr4475 Месяц назад

I haven’t watched this video yet, but the puzzle took me 10:33 which suggests one of two things - Mark missed something which I happened to see quickly , or I made a logical error which just happened to work out.

@artsenor254 Месяц назад

I personally made a logical error that could have made my time way faster as well had I just followed it through the end (I stood with the idea that there could be no 4s and 6s in any of the green lines, which isn't exactly true, though it turns out to be the case). Wouldn't have made it in ten minutes, though, that's fast. xD

@NeilGirdhar Месяц назад

Woohooo! 25:38 My obsessive pencil marking finally paid off.

@benjaminrealy5661 Месяц назад

25:50. Just coloured lows and highs. As candidates became apparent row 3 either coloured or solved itself. Soon enough the blue diamond centered I'm box 9 made column 7 impossible. Then I noticed it was slightly darker. Dang partial colorblindness. But it didn't really unwind any work, thankfully, just slowed me down as to where a 6 could go. But definitely biggest tip would be examining what candidates would impact other cells with the sums VS the green line rules. Several times I had the interaction "x forces that to be Y which forces that to become Z which can't work because the Z then forces another X into that (row, column, or box)

@Rach881101 Месяц назад

17:31 for me. Nice puzzle!

@inspiringsand123 Месяц назад

Rules: 01:40 Let's Get Cracking: 02:23 What about this video's Top Tier Simarkisms?! Three In the Corner: 1x (1:03:50) Numpty: 1x (34:20) And how about this video's Simarkisms?! Goodness: 6x (18:36, 22:24, 29:17, 36:29, 46:25, 1:04:12) Ah: 6x (08:20, 12:05, 14:34, 17:45, 22:24, 45:13) Sorry: 5x (06:35, 14:38, 24:16, 57:46, 1:02:10) In Fact: 5x (07:33, 10:59, 39:29, 57:53, 59:56) Bother: 4x (14:29, 14:32, 14:32, 47:05) Hang On: 4x (21:59, 21:59, 21:59, 45:50) Weird: 3x (13:53, 25:50, 28:16) Useless: 2x (41:07, 41:19) Brilliant: 2x (00:19, 00:34) Fascinating: 2x (08:49, 35:11) Obviously: 2x (17:17, 54:58) Wow: 2x (09:57, 1:03:18) Good Grief: 1x (34:47) Stuck: 1x (51:18) Astonishing: 1x (16:24) By Sudoku: 1x (1:02:16) Bonkers: 1x (06:38) Pencil Mark/mark: 1x (16:24) Symmetry: 1x (41:26) Most popular number(>9), digit and colour this video: Eighty One (10 mentions) One (145 mentions) Green (37 mentions) Antithesis Battles: Low (59) - High (46) Even (6) - Odd (0) Inside (2) - Outside (1) Row (16) - Column (16) FAQ: Q1: You missed something! A1: That could very well be the case! Human speech can be hard to understand for computers like me! Point out the ones that I missed and maybe I'll learn! Q2: Can you do this for another channel? A2: I've been thinking about that and wrote some code to make that possible. Let me know which channel you think would be a good fit!

@spin-rg9ib Месяц назад

for these polarity ones like this i usually just do use the corner notation for one polarity and the center cell notes for the other polarity and just do the puzzle both ways at the same time, to figure it out. eventually either all the corner notes will be eliminated in a cell or the center cell digits will be eliminated and it will tell me the actual polarity of the cells. then just delete all the either corner or center notes that dont work. and left with the right notation.

@LednacekZ Месяц назад

40:41 today. a long start. i ground it down slowly. once i got which was high and which low it unravelled itself.

@Gonzalo_Garcia_ Месяц назад

27:23 for me. Tough puzzle!

@10prozenthimmel Месяц назад

Does Mark film in a hotel? 15:29 There are so many kitchenware noises in his background. I’ve noticed this many times before.

@Yttria 28 дней назад

This one was tough took several attempts because I kept making a mistake.

@leickrobinson5186 Месяц назад

Fun puzzle! 24:03 for me. :-D

@EricMill Месяц назад

Why don't you link to your Patreon in the video description?

@MadsOcto7 Месяц назад

They do now. It's at the top

@emilywilliams3237 Месяц назад

I thought this too - I see it now, so maybe it was updated. It is not a hyperlink in blue (for my browser) but a different-looking link right underneath the Patreon heading.

@Shoshiroll Месяц назад

18:28 lets goooo

@Kirbyfan87827 Месяц назад

It took me like half an hour just to get the one-cell segments of the blue squares through trial and error and I've got a placeholder parity set up for the German Whisper lines but I'm 41 minutes in and I'm still stuck. I thought I would be able to do this puzzle if people in the comments are getting times like Shoshiroll's 18:28 and leickrobinson5186's 24:03 but if it's taken me this long and I'm still stuck then I don't even WANT to finish. I don't even wanna watch the solve. Screw this puzzle and screw me for letting my expectations get so high.

@David_K_Booth Месяц назад

I notice that you and I often post similar times, and this one took me nearly an hour and a half. I agree, if the puzzle has stopped being enjoyable and is just frustrating, there's little point in grinding on.

@ouwebrood497 Месяц назад

If I have something like this, I put it to rest and I'm always free to try it a different time. Once you're too far 'inside your box' you are stuck completely.

@dinane Месяц назад

If you keep whittling down pencil marks you eventually reach a point where some cells are only 1 of each high/low. You can then fairly quickly figure out combinations that don’t work. I just think you gave up on looking for hidden triples too soon. You were close!

@_-_-Sipita-_-_ Месяц назад

15:20 for me.

@ouwebrood497 Месяц назад

If he just coloured the 1-6-7 pencilmarked cells with green and purple.......

@theredstoneengineer6934 Месяц назад

47:42 for me

@tonybrooms Месяц назад

00:25:03

@Catmandoku Месяц назад

Wow I never get here this early!

@robertcousins2274 Месяц назад

10:30 for me

@bait6652 Месяц назад

This design def begs the q? How many of those givens are needed... Turns out you only need the given B1:7 ....the 5 & other 7 are DD. q? is how many solns are there if its a 6 not 7