Aad's Roaring Four 'T's Sudoku
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- Опубликовано: 6 сен 2024
- You can try this awesome puzzle from Aad Van De Wetering here:
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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.
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Simon and Mark
The puzzles by Aad seem to be the only ones on this channel I can actually solve on my own. Still took me an hour, but I was happy I managed to do it.
Three minutes from the end: "We *might* be on the right track." One of my favorite Simon-isms.
I really liked this puzzle. I also find it both amusing and unsettling that you managed to complete the puzzle so quickly while also missing so many obvious things that were staring you in the face all the while.
same thought exactly, first thing that popped into my mind was the obvious 7/9 pair at the top :D
My experience watching Simon solve sudoko: Be ahead of him and watch him miss simple gimmes, running out of things I've seen he hasn't seen, Simon casually and easily finishing the puzzle after I got stuck
First video where I've noticed so many things before he did. Made it tough to watch.
This is probably the video where I wanted to scream on the screen the most.
2:24 you guys are my only Patreon subscription. I've bought both apps, and subscribe at the $3 dollar level. Thank you for all the fun you gift us.
Hi Simon, It was an incredible puzzle. I love this variant of Sudoku. Discovering the numbers in the T shapes and using that to find the other numbers is great fun. As always great videos and puzzles. Looking forward to the patreon puzzle and the solution video.
Gene
Today's puzzle is too difficult and slow (and Wrogn), I'm saving it for retirement. The Algorithm gave me these older faster puzzles and I loved the two-tee one. I'll do this four-tee one next but not tonight. Already gave it the up-thumb because I know it will be worth it.
17:54 I solved this 3 placement differently. First I noticed that the T shape in the lower right corner has only 2 candidates for a 3: box 9 square 4, and box 6 square 7. BUT, if 3 is in box 6 square 7, it rules out a 3 from both squares of that 3/4 pair up there, because it sees both of them. Therefore, the 3 for the bottom right T shape must be in box 9 square 4.
36:21 solve time; I was pleased with myself for spotting that the T-shapes had to be a 12346 combination (relatively) early, but as with most puzzles on Cracking The Cryptic, the puzzle proved to be surprisingly resilient even after that. Really enjoyed solving through the logic behind this one though, thank you once again!
52:15 after a couple of false starts. Slept on it and succeeded over breakfast. What a nice puzzle Aad, many thanks.
36:05
A slice of life before Sven *shudder* but the quality of Aad's puzzle made up for it.
It took me an hour and ten minutes, but oddly enough I rarely felt like there were any points where I got excruciatingly stuck. There was just so much content packed into one puzzle, well done
01:16:34 - took some time to wrap my head around what the constraints actually meant (and I kept thinking the grey cells had to be higher, not lower - thankfully there's an undo function). Still fun to solve, though.
I love watching the videos for puzzles like this where there's really only one solve path. Knowing what comes next is half the fun, just waiting for it to be seen. For pure fun value in solving, I think I slightly prefer solving puzzles that are a little more open, with all kinds of stuff going on everywhere. But this was another great puzzle. I wonder what Aad will come up with next.
At about 7:00, you can disambiguate where the 1 goes by asking if you put it in the lone cell sticking into the Top Center box, where are you going to put it in the Top Right box? There won't be any legal positions and so you know it can't go in that cell.
I've been watching these videos for a while and this one was the first one that I tried to solve myself. I feel like I've learned something since it took me an hour to solve but non the less I am amazed I did it. Thank you!
One really cool thing that unfortunately you missed with the bottom right T shape was that the square inside the bottom central box couldn't be a 6. There were 3 adjacent squares all in the same box and an 8 already in the box so there was not enough numbers left greater than 6. Thus it had to be a 4. Still a really good solve.
I really like this style, but... I had to restart like 4 times, and then gave into help. My time says 31:49, but it easily took me 2 hours more than that. Not sure why I kept missing things with this one. Would love another try at one like this.
That naked 4 on the 3rd column got so disambiguated it might as well have had its skin removed
coming back to this puzzle, it is still a joy to watch and to solve
A very beautiful puzzle ... challenging but not too difficult.
My biggest hint for this puzzle, first figure out which numbers cannot be in the T's, and then you can more easily determine what CAN...
27:53 and absolutely chuffed that I completed it so quickly - normally much slower. Had all but the bottom right filled in early on and I had that last one filled in about half way.
1hr 16min beautiful logic !!!!!!!!!
Missed a lot obvious details, the first one was that it took way to long for me to realise which numbers should be in the T's when it was really clear. Took almost 42 minutes for me, but it was a nice puzzle.
23:19 while following along for half of it or so. At one point it clicked for me and I stopped listening to complete it myself lol.
Great puzzle! After one restart to clear a bad placement (always brutal when you can't quite backtrack your mistake), finished this one in 54 minutes. Very neat logic. I can't imagine what it must be like to set something like this.
28.02
ty for the puzzle
19:00 places 4, says its easy to miss what's staring you in the face, misses that a 6 requires a 789 to be surrounded and there's an 8 already in the 3x3
Took me 37:33 but I got distracted in the middle, probably closer to ~33 mins effective time spent. Very fun puzzle, loved figuring out the logic to place the 1s at the start
Glad to see I'm not the only one who missed so many things staring at me haha
Took me an hour and 47 minutes. Twice I ended up with an impossible combination of twos and reset, had to watch the video to figure out where I was using faulty logic. The ones were to blame.
that's funny because it also took me 1h47 and the same thing happened to me with the 2s, what a crazy coincidence
1:11:32 Damn half of that time I was staring on the screen, and then I saw something and it was an avalanche.
These T-puzzles are a lot of fun. I'm looking forward to solving more of them.
1 hour 24 minutes, it was such a stretch for me but i solved it in the end, wonderful puzzle!
45 minutes. Loved the logic here. Really enjoyable puzzle.
Knew this was going to be fun. Love these T puzzles.
37:57, not too bad
I solved it, but had a completely different arrangement of number in the 'T's. on the bottom left I put '4' in the upper box instead of 6 though (swapping the 4 and the 6 position)
I'm a bit surprised u used the top right 6 as an example to explain the orthogonally rule. And then didn't pencil mark them in imediately. Thad helped me deduce the 4 in the top left box quite early on. Still took almost an hour finishing it afterwards, but had great fun. Said it before, and will say it again: Aad is BAAS!
Solvable without help. Nice idea.
I love these puzzles. Two failures from making logic errors, so then I stopped and watched the video. So much fun even so.
56:39 - that was not easy. Thanks for the puzzle!
Very clever ... and it defeated me even after three attempts.
10 months later and so many attempts. Finally, I cracked this puzzle in 1 hour and 25 minutes!
Great puzzle. Really enjoyed the solve.
1:25:09 (+3 months late) Super awesome puzzle
I liked this puzzle! This is my first time trying one this hard and it only took me 2hrs :')
I tried the puzzle for over an hour just to find out I made a mistake somewhere. XD
Ill maybe take a look at this puzzle a day later maybe, since I do felt like I could learn from it, I also felt like I came close, I just made a mistake somewhere... :'D
Same here, only in my case it was several mistakes. D'oh!
I had a similar issue, mixed up a set of 7/9 which looked to be working great only to bite me in the butt 10 minutes later. All in all, the solve took me roughly 80 minutes.
Same here
I almost got it after 37 minutes but it didn't work. Looking at the video, I realized I placed a 2 somewhere where it didn't need to go and got a couple of my grey square digits mixed up, so no biggy, but I still claim defeat. Was an absolutely gorgeous puzzle (ok these guys are rubbing off on me); I actually got giddy when I found a 1 because there was no other place to put it in the column without it being next to a grey square xD
took you so long to realize how important the 6s are, but then again im in the backseat
managed to get right numbers in grayed Ts, but in wrong order (too lazy to rewatch) and ended up with double 5 in 9th square (which made me look up answer and give up), nice puzzle anyway!
52:12 - Great puzzle..
i used a slightly different logic to find out the 5 digits in the T-shape. i ruled out R5C2 & R5C3 from being 2's because they were next to a T-square in a box already containing a 1. so 2 had to be in one of R4C3 or R6C2 in the left-middle box. putting a 2 in R6C2 would leave nowhere to put a 2 in the T-shape above it, so i reasoned that R4C3 had to be a 2.
from there it was straightforward to find that the last remaining digit in the T-shape was a 4.
Loved this puzzle! Just wanted to ask how was the 8 in 20:38 was resolved? Why wasn't it a 9?
Because 6 & 7 are locked into the c8r2
@@rottish Yeah i get that but why isn't it a 9?
See penciled 8s in box 9, row 9... they require 8 to be above the 9 in box 7.
I missed the logic on the twos in row 6 so missed the x-wing. Ended up guessing on the 2 in col 9 and got it right but it took way too long.
Took me 39 minutes, fun puzzle
1:16:52. As often happens I missed some of the "obvious" things and ended up trying some bifurcations. Eventually one branch of one of them petered out, and after that things went fairly smoothly.
Loved this one. It was hard, but fun and interesting
2 hour 29. Oh dear.
Official time: 22:24:55. Woo!
It's a tough puzzle to get started in, at least for me. But I think that if Simon watches this video a second time, he'll notice several times after the 18-minute mark when numbers could have been filled in much sooner than they were. The four's in the three boxes on the left could have been filled in at 20:20 (if not sooner). But I say that just because it gave me an excuse to write "2020". 😊 There were a few other examples like that though. Hard to say how much faster it could have been solved. Possibly a minute or two.
49:11 great puzzle
very nice puzzle this one was took me two tries and a 2 hours to finish it
26:08
noticed the 1 trick right from the start
Logic Question: Would the puzzle still work if all 1s were swapped with 9s, 2s with 8s, etc and the condition was that surrounding cells must be smaller?
Yes
Cracking The Cryptic Drinking Game - take a shot every time they say "can't resolve that" (when they clearly can), down a pint anytime someone says "cooking with gas"!!! ;)
This is just magnificent!
I was expecting Simon to find the 79 pair surrounding 6 in box 3 at the outset
Finished with a 57:56, I unfortunately made 2 lucky guesses that worked themselves out correctly, but overall tried to stick to logical paths. Great puzzle
My solution looked much different, and I'm going to rework to make sure I'm not misremembering in the few minutes I posted my completion time and watching your video.
The difference was in the 2 lucky guesses most likely. I solved with C1, R8, as if it were an 8.
I can't seem to replicate whatever strange logic I used from that point. But I do remember the "Looks good to me." When I pressed 'Check'
Hello! I finished the puzzle and in the end I noticed that the combination of 2s and 6s, down the middle 3×3 squares is symmetrical. Does this mean that there are two possible solutions?
I'm 2 months late, but here goes:
A white 2 cannot be next to a gray 4. Therefore, 2 and 6 cannot swap places with each other.
It took me 52:02, I was slooooooow
I did enjoy this, Simon!
Resolved
23.52
Brilliant! The fact that the T shapes could lock a number in a row/column but over two boxes really messed with my logic.
Great puzzle, but my computer screen has finger prints where I am jabbing at squares to fill, and my voice is hoarse from yelling 7&9 in box 3. arghhhhhh
Enough things obvious to an incompetent like me are initially missed that I don’t feel like a total idiot...
Solved with only 1 tiny hint about something I was overlooking around the 2 in box 9 (had to let the video catch up to that point to catch the silly oversight I had.
the rules state "a digit in *one of the grey cells* is always smaller than (...)"
one of the grey cells in what? a grid? a T-shape? confusing
It means "one of the grey cells (out of any on the board)". Alternatively, he could have phrased it "digits in the grey cells are always smaller than [...]" but it works either way.
Inderdaad een mooie puzzel Aad.(Indeed a nice puzzle Aad)
At 23:00 I have 1 T shape filled in and 1other gray digit placed. I have no white digits placed. Time to watch the video.
1h47 this is actually the first puzzle i manage to solve in this channel
The 12 pair up top eluded me and once I found it the whole thing came tumbling down.
28:07! Super fun
Tougher than I first expected. It took me 32:43 to finish.
this took me one and half hour to do
Best
Things would go a LOT quicker if you just listened to reason and did things in sequence instead of jumping all over the board with "fancy techniques" ..
That was hard, mostly because I kept missing easy stuff like that 5 in R7 couldn't go next to a 6.
Very nice! I actually saw all the logic involving the T’s very quickly, but my ineptitude at classic sudoku logic meant I was only able to finish in 12:52; slow!
1:31:51 I did not remember that 5 cannot be in any orthogonal cell of 6 at r7c7 and stared at it for about an hour. I feel dumb.....
37:32 :)
19 minutes and 49 seconds.
50:01
HOW?!?
CBear ʕ •ᴥ•ʔ i really absolutely don't know
17min, as soon as you spot the 2 X-Wing, it basically turns into spot the naked single.
Made it in 43:43
Took me nearly 2 hours because I keep missing obvious sudoku deductions.
I was halfway through and accidentally hit ctrl+R instead of ctrl+number :(
Ah, I had to actually start watching the video to realize that "A digit in one of the grey cells is always smaller than..." does not mean that each T has one such cell but "A digit in any of the grey cells..." .
Am I the only one having a problem with the phrasing here?
I hate these "orthoganal" rules. I always get in a twist with the logic. Spent ages on it only to find a flaw somewhere really early. Tried again. Same! :(
why 17?
I was solving so long but i was applying exact same logic all the way through.
Edit, pencil marks must be a running joke on your part of solves.