How Many X-Wings? A Sudoku Trainer!

Рет қаралды 23,307

4 жыл бұрын

You can try this beautiful puzzle from Sam Cappleman-Lynes here:
cracking-the-cryptic.web.app/...
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▶SOFTWARE◀
We sometimes use Duncan's Sudoku Solver, which is available at www.littlegogs.com/index.shtml
Or our own software, which you can access by clicking on the links under the video.
▶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 eleven-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: 52

@wescraven2606 4 жыл бұрын

This really helped me with X-wings. The guy who made this must be quite clever.

@rabidsamfan 4 жыл бұрын

That was a brilliant puzzle. A great tutorial for xwings too!

@dosenmarko 4 жыл бұрын

You should try live solve on youtube or twitch so you can advertise your app and we can scream at you during solve :D

@RandomBurfness 4 жыл бұрын

Dear lord this puzzle. It took me over an hour, and I had to find first an X-wing, then I found a jellyfish (which later separated into two X-wings), then I found several swordfishes (two of which lead to a hidden triple), then I found a Y-wing (first Y-wing I was able to spot by myself, progress!) which lead to finding multiple hidden triples, then I found a final X-wing which made the whole puzzle collapse. Now time to see the more efficient way of solving this puzzle.

@hilcovanbreeschoten720 4 жыл бұрын

46:23 I basically followed the same solving pattern as Simon, although twice as slow of course. Spotting the x-wing on 9s forcing another seperate x-wing on 9s was mind boggling, and very satisfying.

@Socrates... 4 жыл бұрын

Brilliant will watch this video often

@fmakofmako 4 жыл бұрын

Very informative and entertaining. I'll have to watch this a few times.

@lindasherman9921 4 жыл бұрын

Brilliant and gorgeous puzzle. Thanks Sam!

@jordancummings4639 4 жыл бұрын

Watching you solve this one I think *finally* got me to understand the X-wing concept at a basic level. I was able to spot a double X-wing on 5s in 4 different columns and it helped me crack the puzzle! I appreciate your videos! Subscribed.

@boydegg 3 жыл бұрын

Phew! I understand the logic of x-wings. Spotting them and seeing why they help me during a solve is another story!

@ragnkja 4 жыл бұрын

The opening is a good "pointing pairs" trainer as well.

@BlueCyann 4 жыл бұрын

This puzzle solves quite differently when you follow through on that early X-wing on the 9s before moving on. There's a 79 in the top central box that collapses to just a 7, gives you a bunch more solves right off the bat at least if you've ground out all the pairs first like I tend to do. Thanks for this video. I used to be able to solve some seriously difficult Sudokus (on paper) but had forgotten almost all the techniques I'd so painfully worked out. I can't even remember whether this was one of them, but it may have been. The other day I was doing one, found what I now know is called an X-wing, just absolutely knew it was significant, but wasn't able to make anything of it. I'm not sure now whether there actually wasn't anything to be made, or whether I overlooked to eliminate numbers from one or more critical cells. Oh well. Now it's fallen into place!

@jonasgleim7612 4 жыл бұрын

What. The. Hell. That was insane. Brilliant construction

@JohnRandomness105 Жыл бұрын

Just what one expects in a puzzle devoted to training X-wings: a jellyfish in 2s. (Later) followed by an almost useless finned X-wing in 9s. Then I realized that I didn't notice a 6 ruling out a cell, and I could place a few other digits. So finally, I spot my first true X-wing, in 6s. 7:10 This was the second X-wing in 6s that I found. The first was based on a 69 pair that hasn't yet been entered on this grid. 14:40 The jellyfish in 2s let me place the 2 in row 9 much earlier. That led to the 24 pair and the 69 pair in column 7, which led to my first X-wing in 6s. 16:10 I found the X-wing in 9s much earlier, because of the 69 pair. Without the top corner 4, it was only a useless finned X-wing. In the middle of the solve, there was a 679 Y-wing or bent triple in rows 4 and 9, and columns 3 and 9. It was one of those useless things, although it gave practice in spotting them.

@neilgerace355 4 жыл бұрын

The Empire cannot repel fire of that magnitude

@Tehom1 4 жыл бұрын

Great exercise for finding X-wings!

@ODDnanref 4 жыл бұрын

This puzzle helped me understand x-wings

@JeffVoegtlin 11 ай бұрын

You only need the first x-wing to solve the rest with normal sudoku techniques. Pencil the 6s in the bottom left square. That forces the bottom right cell to be a 6. From then on no more x-wings.

@Coyotek4 4 жыл бұрын

49:34 Phew! This one beat me up, but I finally solved it. Suffice to say, I need work on finding X-wings!

@jdoe834 4 жыл бұрын

Despite it being an exercise in xwings, when I was at a position similar to 9:18, I happened to notice r3c4/r3c9/r4c3/r4c9 would be a deadly rectangle unless r3c4/r4c9 are both 7. Things diverged for me quite a bit from there, but I wound up solving it in 17 minutes. Still quite a few xwings!

@ordoordo 4 жыл бұрын

Wow, I struggled with this one! Frustrating and yet fun!

@JustFun-iz9rf 4 жыл бұрын

Good stuff

@jimdetry9420 4 жыл бұрын

There was a very early X Wing on 6s starting in column 9 (where you started with the 7s X Wing) and column 3. Then, when you find the 6 in R1-C5, you get another X Wing on 6s in columns 2 & 7

@JohnRandomness105 Жыл бұрын

Because of the way I did the puzzle -- finding a jellyfish in 2s before anything else -- I found that other X-wing first.

@dionlindskog3756 4 жыл бұрын

I am confused, the first X wing is about 6 minutes in based on 6s in columns 3 and 9 rows 3 and 9 then at about 13.26 Simon says he can't see an x wing there because 6 can go in other columns in row 9?

@mitty608 2 жыл бұрын

I eventually got there on this puzzle, I was just wondering how someone would keep track of this and pencil mark when using a pen and paper, as the webapp really makes it much easier

@ukdavepianoman 4 жыл бұрын

First X wing 6s ==> r7c2 must be 6. Still, a very good solve and there were at least 7 X-wings, I think...

@neomorphicduck 4 жыл бұрын

I totally missed that! Good spot!

@nightwishlover8913 4 жыл бұрын

You're going to break that keyboard one day soon!!!! Good solve, though.

@dominrael8658 2 жыл бұрын

didnt find the final green x wing on 9s, instead i used the other x wings and found the other positions for the 2 5 6 7 in the lowwer left box and saw a 3 9 pair which cracked it for me.

@TheMadrory 3 жыл бұрын

1 hour in and find out I broke it, so I've given up, and will just watch the solve

@TheErusPrime 4 жыл бұрын

Until this puzzle I had trouble with xwing logic. I'm sort of new to the world of puzzles. Could you do a textbook style tutorial on the logic of human solving sudoku? I'm still maybe 10+ minutes behind you in a lot of these. i feel like I'm missing something.

@travholt 4 жыл бұрын

Honestly, 10+ minutes behind one of the best sudoku solvers in the world isn't that bad when you're "sort of new" - even considering he talks and explains while solving. And there are a lot videos on this channel about basic solving techniques. It's hard to do just one video on how to solve sudokus, because puzzles can be very different in terms of difficulty and techniques required.

@TheErusPrime 4 жыл бұрын

@@travholt Well, 10 is kinda my best. I seem to have an affinity for killer sudoku. For other variations or vanilla it tends to be more on the + side.

@gposchman 4 жыл бұрын

X-wings are my bane. I can find some, and I will revisit this puzzle in a day or two. I seemed to miss place numbers and ran into more false solves than ever before. Maybe I'm off my meds. A great puzzle as always, I hope it will help me see potential x-wings. I am a patreon and I enjoy the sandwich sudoku game, I have 2 to go. There is going to be one without any numbers, isn't there?

@CrackingTheCryptic 4 жыл бұрын

That's actually impossible! (If there are no 1/9s given in a standard sandwich Sudoku then there would have to be 2 solutions to the puzzle (as you can simply switch all the 1s and 9s round and nothing else will change!)).

@gposchman 4 жыл бұрын

Didn't think of that, so the will be one with just a 1 or 9.

@insectbah 3 жыл бұрын

took me over 2 hours, but I did it!

@mihailoguberinic4605 4 жыл бұрын

this guy is killing his keyboard

@chookingvid 4 жыл бұрын

I solved it using only one X wing.

@chloemaxwell2628 3 жыл бұрын

You call it beautiful, I call it ridiculously hard, tomato, tomaato, LOL!

@r0bw00d 3 жыл бұрын

You found 6 X-Wings.

@topilinkala1594 11 ай бұрын

Did you count the first on 3's.

@carstenkruse8527 4 жыл бұрын

would you be interested in solving a puzzle NOT being a sudoku? then I could give you one from Denmark

@04LightningFan 4 жыл бұрын

Simon regularly does other types of logic puzzles on the channel. Besides sudoku variants like the popular sandwich sudoku, he's also done compass, skyscraper, and star battle puzzles. He often invites people to send new puzzles to his twitter or email, so I'm sure he would like to receive your puzzle from Denmark. Seems in the last month, he has done about a dozen puzzles submitted by subscribers.

@dekrachtbron-be 4 жыл бұрын

What is the name of the puzzle? Y have just created a mystery sudoku. You can try it on my website. kzfaq.info/get/bejne/mZebhrpe27immpc.html

@carstenkruse8527 4 жыл бұрын

@@AnonimityAssured yeah Ive sent some to them but they havent answered....so I did it via this

@carstenkruse8527 4 жыл бұрын

@@04LightningFan yes im well aware of that...thanks though

@r0bw00d 3 жыл бұрын

I quit here: i.postimg.cc/qMbx0W7t/Sudoku.png I see a couple of crooked rectangles on 8s, but I don't know how to do them.