How the world sudoku champion solves sudoku

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How the world sudoku champion solves sudoku

Рет қаралды 169,091

Күн бұрын

Simon takes a look at how Kota Morinishi, the world Sudoku champion, solved one of the hardest puzzles from Nikoli.com.
You can try the puzzle in our software here: app.crackingth...

Пікірлер: 112

@n0b0dy5p3c1al 5 жыл бұрын

That was humbling and mind-blowing! What a brilliant solve! Thanks for walking us through it. A rare treat.

@martentje61 4 жыл бұрын

Of course Kota Morinishi is a genius. But this was certainly not one of the hardest puzzles. You do not need advanced techniques like Wings or Fishes etc. to solve this puzzle. Still, his skill of finding a naked triple so early in the game is amazing!

@bakergary007 3 жыл бұрын

That took me 1hr 32 minutes 😳 .. AND my tea went cold. World Championship Challenge on hold for now ☺

@owenkirkeby5426 3 жыл бұрын

1 07 u r bad son

@rabidsamfan 6 жыл бұрын

Wow. That was amazing. I am going to try solving that one, too, but I'll need a LOT more pencil marks. I can't keep all that in my head. Thanks for showing us the website too!

@stefanholbek2449 5 жыл бұрын

I was able to solve the whole thing from this triple alone !!! AMAZING new tools I find here, but of course: We will leave out data about the time I needed ... ;O)

@Freeedy 4 жыл бұрын

You don’t get to world champion level without being ultra clever. Perhaps he is the Usain Bolt of Sudoku.

@richy77 3 жыл бұрын

Love watching these older videos!

@h0016911 2 жыл бұрын

Kota is such a genius. Being able to spot that triplet in Row 1 is amazing

@zoeboey 2 жыл бұрын

My sister adores your videos! Finds you clever and humorous all in one - keep up the great work :)

@MikeInPlano 2 жыл бұрын

This was enlightening. After watching it once, I replayed it step by step to see if I would have come up with the numbers as Kota filled them in. In retrospect, as you say, Kota's solution keyed on their initial insight for 2, 4, and 5 in row 1. After that, filling in the rest of the numbers was fairly straightforward using basic techniques and logic. But clearly, Kota's mind sees those numbers much quicker than me, and I suspect, a majority of us average puzzlers. It was also interesting that Kota doesn't seem to rely much on pencil marks, perhaps because by the time they make marks in a square they've figured out the resolution of what would have been penciled in. Great video.

@ValeriePallaoro 5 жыл бұрын

Thank you so much. Your method - but using brain power, not pencil notation. Soo very worthy. Much appreciated your skill walking us through it. Excellent work.

@aniketb2010 2 жыл бұрын

Need to Keep solving such puzzles to know more about these Useful Patterns. Thanks.

@tsaykostya 4 жыл бұрын

More of his videos please

@alyssahayes268 9 ай бұрын

Where is this website? In 2023, I'm struggling to find it!

@midnightprotocol8600 9 ай бұрын

Same 😿

@lsmart 3 жыл бұрын

After going through all 9 digits and getting only the single 9 and some Snyder pencil markings, and finding no rows or columns with 5 filled cells, I looked for eliminating cells the NYT way (as drilled into us by Simon) and saw the triple on top. From there on it was straightforward Sudoku, and took me only 18 minutes.

@milkom2021 8 ай бұрын

Skyscraper on 8s reveals a naked 136 triple in row 1, but it took me a fairly long time to spot it

@jelel9698 Жыл бұрын

The 8 was so easy to solve from the beginning. I don't think a world champion would not see it immediately..

@citizensane1426 Жыл бұрын

Thnx 4 Video. I have started learning now (age 87) as an Rx to avoid Dementia.

@forevern2u 9 ай бұрын

HELLO DOES ANYONE KNOW WHERE PEOPLE PLAY SUDOKU WITH THE TIME COMPARISONS? I really want to be able to compare my solving times :) thanks, love you

@danfran5771 2 жыл бұрын

I thought i was fast af but then i entered competitive sudoku and damn i got humbled

@randykuhns4515 5 жыл бұрын

I made a grid with ink and copied the puzzle onto it and finished it in forty-five minutes where I was a little intimidated with it so I went slow and constantly checked for accuracy to keep out errors that would lead to failing and not know where the error began thus having to make a new copy and start over again,.. it didn't seem hard though,.. it broke open on the top horizontal line. Now to watch and see how you solve.

@isabellflorence4956 3 жыл бұрын

Loved it, thank you!

@McMedicful 4 жыл бұрын

So, its now a little over a year later and the site doens't seem to have that feature anymore. Does anybody know an alternative site? thanx

@mikepoirier1 4 жыл бұрын

Could anyone tell me how he can be certain of his first 4 he puts in?

@flashkreiger5055 4 жыл бұрын

In the centre 3x3 box, the left column can’t have a 4 due to the ‘4’ in the above 3x3 box. It can’t be in the second row as there is a 4 in the 3x3 box to its left. Thus the remaining empty spot left is the top right spot in the centre 3x3 box.

@cindyshirey8561 2 жыл бұрын

WOW ! Fascinating !

@05gunnu 11 ай бұрын

Is the website still up?

@swimfit57 Жыл бұрын

Amazing

@koleso1v 5 жыл бұрын

How are you going to apply advanced techniques, such as xyz-wing, finned swordfish, forcing chains, etc without even having all candidates shown? You can maximum do a hidden pair playing like that and even that I doubt.

@hk78901 3 жыл бұрын

Did you make all those terms up?

@hk78901 3 жыл бұрын

@@koleso1v oh my word that is fantastic, thank you for the link, I never knew there were so many strategies haha

@arniehgk 5 жыл бұрын

I have a theorie and i dont know if it is correct. And i dont know how to test it. But if you have a sudoku puzzle where 1 number is is divided between all positions in a block (Ex. the 7 is in the upperleft, uppermiddle, ... , lowermiddle and lowerright (all 9)). All other numbers are also equali divided between these 9 positions. So if there is a 4 in the upperleftcorner of a block nowhere else can there be a 4 in the upperleftcorner of a block. (but only if this is treu for 1 number) Please help me shine a light on this theorie.

@y01ru13 5 жыл бұрын

arniehgk look at 11:00, there is an 8 in the top left corner of 2 different boxes. so unfortunately it’s not true

@arniehgk 5 жыл бұрын

@@y01ru13 For this one it is not treu indeed. You see a double 5 in upper left, a double 2 uppermiddle, a double 6 upperright etc.. and also the 8 in lowermiddle. BUT... if one number is divided between the 9 positions then that is treu for all numbers.. or at least that is my theorie and for so far is has been confirmed.. So what do you think?

@louisakinzel942 5 жыл бұрын

@arniehgk. Tested it by brute force, and found a counterexample: .--------.--------.--------. |1 2 3|4 5 6|7 8 9| |7 8 9|1 3 2|4 5 6| |4 5 6|7 9 8|1 2 3| :-------- -------- --------: |6 1 7|8 2 9|3 4 5| |9 3 2|5 1 4|6 7 8| |5 4 8|3 6 7|9 1 2| :-------- -------- --------: |8 6 1|2 4 3|5 9 7| |3 7 5|9 8 1|2 6 4| |2 9 4|6 7 5|8 3 1| '--------'---------'--------' The number 1 is divided between all positions, but others are not, e.g. there are 2's in the upper middle of two different boxes.

@hellfire66683 5 жыл бұрын

@@arniehgk for the love of all that's unholy spell check

@arniehgk 5 жыл бұрын

@@hellfire66683 well sorry its not my native language.

@QCAndre 3 жыл бұрын

Nice video, but I can not find the web site. Help please. Thank you.

@jons2cool1 5 жыл бұрын

I have a sudoku question, if a number is one of the two possibilities for the row and the column it is in, does that mean that number has to go there? I'm thinking it doesn't, but I was hoping there was some logic behind it to make it true.

@BobbieTheFish 5 жыл бұрын

If they're in the same square then yes. Otherwise not always.

@jons2cool1 5 жыл бұрын

@@BobbieTheFish The two possibilities for the row are in the same square, but the two possibilities for the column aren't. I see what you mean, so in my case it wouldn't work. Do you know where I could look to find some very complex logic chains? Like if the puzzle has 3+ possibilities for almost every cell. I just want to know the correct way to go about it logically without guessing. I've found that there is a disparity between 'very hard' sudoku puzzles and 'the world's hardest', which can't be solved by any traditional methods.

@sudeepdalbanjan8595 Жыл бұрын

Solved on 09-10-22 in 23:53

@solfeinberg437 2 жыл бұрын

This guy makes Simon look like me!

@mrcooperclark 2 жыл бұрын

At 5:00, how did you know the nines went it one of the two cells in the bottom left block? How did you know it couldn’t be the top left or right cell of the bottom right block?

@SilentAssassin01234 2 жыл бұрын

Becase there is a 9 in the top left block and a 9 bottom centre block which forces only them two cells

@waterkingdavid 3 жыл бұрын

I watched a video of the world sudoku championships 2018 where a Chinese girl did one in 55 seconds. That is almost the time it takes just to write the letters in. I simply cannot see how that is possible.

@freddytheshadowninja 4 жыл бұрын

I wish he'd been commenting on the move Kota made at 10:17, because that's the one thing I personally didn't know and still don't understand from his solution.

@robb9779 3 жыл бұрын

Late reply, but bottom left set of 3x3 can only have 9s on top row, so top row is 5, 9?, 9?. Therefore, bottom right set of 3x3 must have 9 somewhere in the bottom row. Similar logic applies to force 9 into left side. Hope this makes sense. :)

@Rukimix 3 жыл бұрын

@@robb9779 Also late response but I think it's easier, the 9 of the bottom row can't be on the bottom left 3x3 like you said, it also can't be on bottom mid, and since the right 3x3 can only have a 9 in the middle column, the 9 on the bottom right 3x3 can only be in that place.

@tanmay8759 Жыл бұрын

we are having 9 and 6 to fill there, see in 2nd row 3rd column matrix 9 can be placed only in middle so 9 is placed in right in that and 6 is in left

@niceman9605 2 жыл бұрын

Website name??

@suntexi 5 жыл бұрын

Apparently, sadly, nikoli.com is closing down.

@yvrelna 5 жыл бұрын

@Madolite The puzzles on the site requires Adobe Flash player. For all intents and purposes, it's already dead for many people anyway, which is a shame since they make great puzzles.

@sathvik9487 5 жыл бұрын

@@yvrelna Yes i cant access the website, do you know any other way, can i access it if i install flash? or see any other videos like this

@randykuhns4515 5 жыл бұрын

watched, and it checked out right on,.. I always do in ink with notes but differently than what I've seen others do. I've often wondered if the solve pattern HAS to be EXACTLY the same and now am inclined to say yes, you may find some stragglers that may not further the solve, but the puzzle itself, I BELIEVE,..has to follow the same route.

@glennmelven3414 5 жыл бұрын

After getting that 245 triple I managed to solve the entire puzzle in 32 minutes. I can't figure out what these guys were talking about when they said this puzzle was way to difficult. I am not a world class solver by any stretch of the imagination.

@poorest 2 жыл бұрын

I couldn't solve with Snyder notation... can only get 3 rounds of triples after filling all the candidates

@krithikaacharya272 2 жыл бұрын

Can anyone tell me what was the trick used to find triplets

@Ew72Qa 2 жыл бұрын

There's no trick, he just saw that none of the three numbers could go in the 4 cells of the first row that he left blank, therefore they had to go in the three remaining cells.

@jeffbrunton3291 5 жыл бұрын

Excellent

@caryg1069 5 жыл бұрын

Took me 15-20 minutes to solve. I got the 245 triple in a much more labor-intensive way but would agree that step is the most challenging part of the puzzle technique wise; nothing crazy required, it's just a grind right from the start.

@JCMillner 5 жыл бұрын

Ofcourse hes classically British

@llosqtglowing 4 жыл бұрын

@dragonkukulcan 5 жыл бұрын

Have you ever solved a Maya Cosmic Number Puzzle?

@Blubb5000 4 жыл бұрын

My "fill it up with all possible pencilmarks" method enabled me to solve the puzzle in a bit less than 6 minutes.

@twizzted3656 5 жыл бұрын

I actually thought that triple thing was just something I had been doing because I tend to complicate things more than I should. Hehe thank you for feeding my ego with saying that the top puzzle solvers use that method

@alienrenders 4 жыл бұрын

I did it in 23 minutes, but I had to fill the entire grid with all the pencil marks. The were a lot of hidden triples in this one.

@titushui 6 жыл бұрын

Indeed, this puzzle contains two hard points - one is 79 hidden pair which is solved by Simon in the 7th square. Another one is the hidden triple 245 in the first row which is discovered by Kota immediately in the first place.

@paulreader1777 6 жыл бұрын

I find your comment interesting as the 79 pair in the 7th square is obvious from Snyder technique and the triple is also obvious from extending Snyder to include pairs in columns and rows as well as in blocks/boxes/squares. I take it from your description of them as hidden that you usually start with all possible candidates filled in.

@titushui 6 жыл бұрын

Sometimes I overlook the hidden twins or triples by just finding all possible combinations in the remaining unknowns.

@paulreader1777 6 жыл бұрын

Thanks! I'm still trying to "prove" to myself all puzzles can be done by only finding pairs, albeit extremely slowly. I also need to find some better software as inserting pencil marks and numbers is painful compared to the ease with which Simon appears to do it.

@songphuongable Жыл бұрын

I Finish it 7 minutes

@WatercraftGames 4 жыл бұрын

Legends use the newspaper Sudoku

@alliwantisyounknow158 3 жыл бұрын

I solved sudoku without pencil is it ok?

@joshwinters6214 4 жыл бұрын

Can't believe this has over 100000 views

@OurBros 3 жыл бұрын

why

@angelorcales1572 2 жыл бұрын

Astiggg

@tejaskhandale9076 5 жыл бұрын

What's the name of the website??

@CrackingTheCryptic 5 жыл бұрын

It was from Nikoli.com but, unfortunately, they have shut down.

@duongnguyen1719 5 жыл бұрын

@@CrackingTheCryptic is there any alternative website to Nikoli that you would recommend? Thanks

@petros-estin-petra- 3 жыл бұрын

@@duongnguyen1719 @Cracking The Cryptic any updates? What website is commonly used now by champions?

@byhinc.4770 4 жыл бұрын

wow

@bluestar2802 5 жыл бұрын

How did he get the 9's at 10:16?

@thisnode 5 жыл бұрын

Kinda hard to put into words, but it's a logical consequence from the 9 at the top left square, bottom middle square, and middle middle square

@pierro2968 5 жыл бұрын

The 9 in the 6th 3x3 have to go in the middle column then because of the 9 in the first 3x3, the 9 in the 9th 3x3 can't go to the top row and the middle column so therefore the 9 goes in the bottom left cell.

@skyler4216 5 жыл бұрын

I know how but it takes too long to explain

@danieltanuwijaya9049 5 жыл бұрын

In box 7, the 9 only can be at b&c (row 7) because of 9 in column 1 and 9 in row 8. In box 6, the 9 only can be in e&h (column 8) because of 9 in row 4. So, in box 9, the 9 already limited by row 7 (explanation 1), row 8 (9 in box 8), and column 8 (explanation 2). The only place left in box 9 is g (column 7 row 9)

@topbizniz 5 жыл бұрын

@@danieltanuwijaya9049 I had the same question. I was able to place the 9 in box 3 (column 9) first with a similar method. In Box 7 the 9 can only be at b&c (which blocks the 9 from being in column 9) and rows 4&8 already have 9s. The fact he placed this 9 directly after the 9 in box 9, followed very quickly with a 6 made me think he had used a hidden 9/6 combo in his logic but your explanation shows that wasn't the case.

@johnbouttell5827 5 жыл бұрын

Phew

@salludalian2005 5 жыл бұрын

The charm of solving a puzzle quickly is sucked out completely if it's solely dependent on the 'genius' of the solver. It's like trying to play 11 notes in an instant - it can only be done by people with an extra thumb.

@wossaaaat 5 жыл бұрын

Or you could use your thumb to play two notes at once, like for a 7th chord or something...

@simon77047 2 жыл бұрын

How is it even fun? I don't do Sudoku to have a race, I do them for enjoyment and relaxation. I guess I am an anomaly.

@Hell-ThePerfectionist 2 жыл бұрын

It's just human nature. A lot of people enjoy being competitive, even if it's against themselves, even when it causes them stress in the process. It's probably fun to those people because of how it benefits us evolutionarily to be competitive, but nowadays we don't need to be as competitive, and so people like you and me just go at our own pace and relax. TL;DR: It's instinctual to be competitive, even with things that don't require competitiveness.

@kurzackd 5 жыл бұрын

maybe he cheated? :D

@kristalball527 6 жыл бұрын

I'm so good I could at that game I can play the hard level perfectly, on my gameboy, while having a seizure (no joke).

@BishopTrask 5 жыл бұрын

Props to the professional who solve that puzzle. That being said what clickbait trash b******* is f****** video is. So the title implies that we're going to get some insight to how a Pro solves puzzles but really what we get is some guy who's been making videos teaching people how to solve puzzles watching a video of another guy who's better at him solve puzzles and just stare dumbfoundedly at the screen going I don't know how we doesn't confirming that watching this guy's videos is a waste your time if you want to be fast cuz his techniques won't get you there and he doesn't know the trick of the real Pro so we just trucks it up to some sort of Super Brain. Good job dude on turning me off to your all your videos in the future. At least I got one thing out of this I need to retrain myself to not depend on the pencil marking trick because if you get too dependent on it it's just going to slow your ass down and i bet it's hard to unlearn to

@EGarrett01 5 жыл бұрын

Well that comment escalated quickly.

@pierro2968 5 жыл бұрын

Pencil marking isn't a trick, it is just a way to remember where the numbers have to go but if a player that plays a lot and have higher memorization just like the world champion, it won't surprise you if he did it in a faster time.

@ValeriePallaoro 5 жыл бұрын

bear in mind; that this is a teaching channel. For newbies to get a start. Watching your teacher watch a better player is good for all. It's enjoyable, and with youtube you can pause and back track to check the working.. Be more generous. Or make your own channel and do it your way. Slow down, smell the roses.