The Sudoku Trick All Expert Solvers Know

You can try today's puzzle - which first appeared as a New York Times "Hard" Sudoku on 27 August 2019 - 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 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.
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Simon and Mark

Пікірлер: 1 200

  • @nicstroud
    @nicstroud4 жыл бұрын

    Who was shouting at the monitor? "You forgot the six." :-)

  • @eireannsg

    @eireannsg

    4 жыл бұрын

    and you forgot the 1,9 and the 4 and....Simon is just a sloppy pencil marker and an easily distracted solver.

  • @Terry1950Men

    @Terry1950Men

    4 жыл бұрын

    I was shouting 7's

  • @christinearmington

    @christinearmington

    4 жыл бұрын

    😁

  • @elizabethgavin1349

    @elizabethgavin1349

    4 жыл бұрын

    Made this harder than need be

  • @shanejett3550

    @shanejett3550

    4 жыл бұрын

    IKR. Explains how to pencil mark etc and then just doesn't notice the 6.

  • @stevenvegh7964
    @stevenvegh79644 жыл бұрын

    First time I’ve seen the recommendation to only pencil mark in when the house can only contain a number with one of 2 squares. Simplifies your marking so much and you can make so many inferences from those without needing to clog your puzzle with marks

  • @savannahbirch5151

    @savannahbirch5151

    4 жыл бұрын

    Yes!!! My main takeaway from this video is to be more methodical in my penciling.

  • @ericcoskun1

    @ericcoskun1

    4 жыл бұрын

    Only penciling confirmed pairs and no other penciling makes it less confusing.

  • @FireSiku

    @FireSiku

    4 жыл бұрын

    I really love the penciling of 2 squares. There are a few situations where I will do it for 3 (for example, number is missing from 3 squares and they form a triangle 2-3-2). There are harder puzzles that do require you to do complete markings, look up the Swordfish technique for example.

  • @archangelsalen1681

    @archangelsalen1681

    3 жыл бұрын

    I always find my self pencil marking almost everything, then regretting it once I need to tidy up... Now I'll try to do his advice and see how I do...

  • @mediamannaman

    @mediamannaman

    3 жыл бұрын

    Yes, the technique is full of potential. But it will require me to UN-learn the technique that I have developed whereby I only pencil in numbers into a square when they are the full set of numbers that can go in that square. I can solve Easy, Medium, and Hard puzzles almost 100% of the time with my technique, but the Expert level usually leaves me having to guess once or twice. I'll practice this technique and see if it can lift me to the next level.

  • @elymihai1981
    @elymihai19814 жыл бұрын

    Am i the only one who realized that by watching this video that i am apparently a sudoku master?

  • @whhhhhhhhhhhhhhhy15

    @whhhhhhhhhhhhhhhy15

    4 жыл бұрын

    All expert solver may know it but not everyone who knows it is an expert

  • @feha92

    @feha92

    4 жыл бұрын

    I still havent figured out the trick the title refers to (due to a lack of timestamp). All I see (though I skimmed) is regular logic such as "because we have a number here, the number cant be here". Nothing along the lines of tricks like finned x-wings or sashimis, or unique rectangles. Am I wrong to figure that the word "trick" refers to stuff that arent just a rephrasing of the rules (like he figured 3 cells must be any of 3 numbers, so the other two in same row can't be those (which is just rephrasing of how rules say you cant have duplicates on a row))? Or is the trick the placement of the notes, as he mentioned at 3:00 that outer marks are for what a number may be, and center marks are when he is sure it "can only be" (hidden pairs vs naked pairs?)?

  • @andrewguthrie2

    @andrewguthrie2

    4 жыл бұрын

    @@feha92 Yes.

  • @adler5653

    @adler5653

    4 жыл бұрын

    @@feha92 around 4:40 but he mentions it a few times throughout the video. at least that would be the 'trick' he explained the most

  • @feha92

    @feha92

    4 жыл бұрын

    @@adler5653 But that isn't a trick in any sense of the word. It is _literally_ saying "because those rows has a seven, they can't have another". Which is one of sudoku's rules, not a trick.

  • @digitalbookworm5678
    @digitalbookworm56784 жыл бұрын

    It's nice to know that I figured out all these little tricks on my own over the years. 😀 The only thing that takes me a little longer is the erasure of actual pencil marks. 😎

  • @chuckcassel5417

    @chuckcassel5417

    2 жыл бұрын

    I don’t erase them , just draw a line thru the false entries

  • @LJAmick05

    @LJAmick05

    2 жыл бұрын

    Me, too!

  • @janemack8852

    @janemack8852

    2 жыл бұрын

    I don't even usually make pencil marks. I use a men. No marks needed.

  • @jmsbwr

    @jmsbwr

    2 жыл бұрын

    Me, too. Except that I use a pen and and mark out changes.

  • @lisareed5669

    @lisareed5669

    2 жыл бұрын

    I do them in pen.

  • @johnnyrandom100
    @johnnyrandom1004 жыл бұрын

    regarding pencil marks... ... I tend to just put a dot in the square corresponding with the possible number required that matches where it would be, as in the square being numbered 1 to 9 top left to bottom right. So a dot in the very top left of the box would be a 1 a dot in the centre would be a 5 and a dot below would be an 8 and to the right a 9. Three rows of three=1 to 9. I hope I'm making sense.

  • @coneberry6905

    @coneberry6905

    4 жыл бұрын

    That's clever. My handwriting is pure gibberish, so i might start doing it this way.

  • @ars85202

    @ars85202

    4 жыл бұрын

    I do it that way too

  • @Ruley005

    @Ruley005

    4 жыл бұрын

    Same same .. then for the definite pairs that he numbers in the middle, I instead, just draw a faint line between the 2 which cancels out all other pencil marks and has precedence. In addition to that, I start with the 1"s and work through to the 9's completing all possible pairs as I go, then repeat. By this time all of the simple ones are solved, then you know you haven't missed any. Sometimes it needs a 3rd and a 4th time

  • @kevinerose

    @kevinerose

    4 жыл бұрын

    I do mine with a pen. It gets a little messy without being able to erase so I tend to circle the value that is correct when I resolve, 2x2s and 3x3s. I try to be very neat with the pen and only start putting notes in when I get the 2x2s all set up. For the notes (any cells bigger than 2x2), I put them in order 123 at top, 456 in the middle, and 789 at the bottom of the box. Cross out when resolved and circle the final answer.

  • @giovannispinotti

    @giovannispinotti

    4 жыл бұрын

    I do use the dot system as a last resort. If I'm on paper, I prefer to mark down outside the grid what numbers do columns and row miss, I find it faster. If I can't crack it like that, then I'll start putting dots in, but it happens rarely.

  • @jimkyle8008
    @jimkyle80084 жыл бұрын

    That was excellent. And the pace wasn't too fast (at least most of the time) for a weak-ish sudoko solver like me. I see a number of comments here to the effect that you missed filling in some numbers sooner, but it seems to me that it's simply a question of where your focus is at any given moment. The main thing is that you get them all in the end, and I thought you did it amazingly quickly.

  • @angelmendez-rivera351

    @angelmendez-rivera351

    4 жыл бұрын

    Jim Kyle If you have a pair of two digits in a box, and you fill in one of the cells, then your focus at that moment should be the box, and the respective column and row. There is no reason your focus should suddenly leave that box, row, and column, and jump to an entirely unrelated part of the grid. It's just messy and it overcomplicates the solving process. And if your video is meant to be educational and not just for entertainment, then you're supposed to teach the lesson as efficiently and cleanly as possible. I think it's completely valid to criticize the fact that he isn't being careful with how he goes about solving these puzzles, and that in turn, it makes it harder for learning viewers to understand the lesson. It's as my parents taught me: do your best, or don't do it.

  • @rogermcpherson3996

    @rogermcpherson3996

    3 жыл бұрын

    cant understand and your dialogue is over the puzzle very iratating

  • @raypitts4880

    @raypitts4880

    3 жыл бұрын

    GO TO SUB TITLES YOU CAN PAUSE THEM TO READ AND FOLLOW THE MOVES SO EASY YEE

  • @gailrodgers3079

    @gailrodgers3079

    3 жыл бұрын

    I have found it natural that when I find the number that fits the square, I check for both other places that the number can go, but if I have only one square remaining in a box, a row, or column, then I fill those in as they open up the 'world' so to speak. I realize that you wrote this a year ago so might might not see this, unless you just want to do a simple puzzle to relax, I would suggest that you work a puzzle that you think might be harder that usual for you. As you do it, you will get better and faster at the simpler puzzles. On my MS version after getting used to doing them with a computer, I started doing the expert level and now I do the grandmaster puzzles. I found when I do the daily challenges that I can whip right through most of them as they don't go up that hard. I spend some time daily doing Sudoku as I am 65 and want to keep my brain sharper and to help ward off dementia. :)

  • @joannegamini2662

    @joannegamini2662

    3 жыл бұрын

    Pop ppl ppl ppl ppl

  • @cindyfalterman547
    @cindyfalterman5477 ай бұрын

    I followed your logic so easily. Thanks for going slow enough to explain and fast enough to not get boring. That was excellent. I am on my way to getting better at these!

  • @grafil01
    @grafil014 жыл бұрын

    This channel was randomly recommended to me by KZread a couple months ago, and just by the pencil marking method I have upped my game from suffering doing medium diff sudokus to finishing hard and very hard ones with relative ease... Thanks!

  • @20DX00
    @20DX004 жыл бұрын

    These videos have been popping up way too often in my recommended feed and I finally gave in and clicked on one of them... I was not disappointed

  • @gordonglenn2089
    @gordonglenn20894 жыл бұрын

    Great, very clear explanations. Makes a tough sudoku feel quite accessible! And I love your software, it is so easy to use.

  • @Militaizi
    @Militaizi4 жыл бұрын

    When I was kid I used to do these markings on the harder sudokus, drives me crazy to see such a nice software so no messy markings all over the paper. : D

  • @illustrationism
    @illustrationism3 жыл бұрын

    "I'm going to step through this reasonably slowly." (Looks at total time of 17 minutes) Dude, that's about half the time it'd take me...

  • @nct948

    @nct948

    Ай бұрын

    Not if you were explaining the reasoning

  • @boorad99
    @boorad994 жыл бұрын

    Literally the best Sudoku tips I've seen. Clear, concise, and not too fast. The x pattern is gold. So glad I found this video!

  • @roughryder5
    @roughryder54 жыл бұрын

    Niceeeeee. I'm still a Novice with Sudoku but I just purchased a Hard to Extreme level book and I've been watching your videos and getting some tips and tricks here and there and I'm getting really good. Thanks dude!!

  • @xilestv
    @xilestv2 жыл бұрын

    I literally fell in love how you taught the tricks. It's actually really hard to teach me usually but i amazingly learned what have you taught in this video. Hope you come back to make more videos! ♥

  • @mafi8360
    @mafi83604 жыл бұрын

    Now we know what Sean Lock does on his days off!

  • @kc5402

    @kc5402

    3 жыл бұрын

    ROFL!

  • @andrewbloom7694

    @andrewbloom7694

    3 жыл бұрын

    Oh my god that's what I thought! Sean Lock with Miles Jupps voice.

  • @johnbee7729

    @johnbee7729

    3 жыл бұрын

    Too funny. I think Sean would have 1 or 47 more f@*! as he solves it

  • @janeksobieralski7334

    @janeksobieralski7334

    3 жыл бұрын

    Hahahahaha love this but Sean Lock wouldve had a lot more swearing

  • @OrigamiGuyII

    @OrigamiGuyII

    2 жыл бұрын

    Well... this hits a little harder now. RIP

  • @nailbiter1
    @nailbiter13 жыл бұрын

    i have been self teaching myself sudoku for about 2 weeks and i’m proud to say that i can understand what you’re saying! great video ❤️

  • @vanrozay8871
    @vanrozay88714 жыл бұрын

    There's a better way to make pencil markings: Put a dot in a the upper left corner of a square for 1, middle top for 2, etc., 'til bottom right corner for 9. easier, less messy than suggested system. A stranger showed me this method a few years ago.

  • @Gnomaana

    @Gnomaana

    3 жыл бұрын

    i don't think my brain would register those as easily. When I write in the actual number, I can stare at the center of the puzzle and my mind instantly sees all the 3's Ive marked. I don't think that would work with simple dots. With dots, I would have to look a the square itself for it to register as a 3.

  • @ericojonx

    @ericojonx

    3 жыл бұрын

    @@Gnomaana takes about a week or two to learn "dots". With the dot system, some patterns become easier to spot.

  • @RaindropsBleeding

    @RaindropsBleeding

    3 жыл бұрын

    for some people that just looks like a bunch of dots that don't form clear patterns

  • @caramba10
    @caramba104 жыл бұрын

    Another excellent tutorial, thank you, highlighting the cells in your software helps a lot.

  • @splode7414
    @splode7414 Жыл бұрын

    For some reason the KZread algorithm put this in my feed today... amazing to see how far the channel has come in just three years, but also that this particular video has >2m views! And even though this puzzle is a pale shade of some of today's logic monsters, it's still as compelling and calming as ever to watch Simon solve! :)

  • @shinyy5184
    @shinyy51844 жыл бұрын

    After binge watching your videos over the past couple of days, I can say that my sudoku skills have improved a lot! Managed to finish this in 18:17 :)

  • @pneumatic00
    @pneumatic004 жыл бұрын

    This was really nice. I liked the process you started @ 2:00; the 2-3-6 in the upper left box and the blank row....which produced the locked 2-6 pair in row 3. And then you came at the X-wings all over the puzzle in a way that...clarified how it's seen and then used. Sometimes you just need something you already know about explained in a slightly different way to see it. Thanks again!

  • @RaindropsBleeding

    @RaindropsBleeding

    3 жыл бұрын

    I've been doing sudoku for years and somehow never spotted the "x-wing" trick. I think my times are about to improve. also I'm totally calling it "x-wing"

  • @TomTalley
    @TomTalley3 жыл бұрын

    Perfect pace for me. Just getting to where I can keep up. Helps so much when you highlight why certain cells are available. Thanks for your patience.

  • @sharonoconnell8653
    @sharonoconnell86532 жыл бұрын

    You are a great teacher. Thank you for your patience and the respect you show to much more moderate players. Of course, you could polish off this sudoku in a fraction of the time this video clip took but that was not your purpose. Thank you.

  • @johndavidalexander6646
    @johndavidalexander66464 жыл бұрын

    Took me 23 minutes... pleased with that. First time using your solver too and it was great to use. The app i normally use deletes my obsolete pencil marks for me when I enter a value which I've always felt is almost cheating. I like that the app makes me do that myself. It made me realise why minimalist pencil marking is important as I had a lot to remove at times.

  • @timdolan4591
    @timdolan45914 жыл бұрын

    Very good. Learned a new trick with the “8”s towards the end. This works well with paper. Thanks.

  • @EntirelyPointlessContent
    @EntirelyPointlessContent2 жыл бұрын

    Nice one. I got this puzzle through a completely different method of finding a couple of x-wings then an empty 7 in a middle column and an empty 1 down in the bottom middle box. It's doable without so many fancy tricks but it was a pleasure to see you efficiently solve it without even needing to run through all the basic numbers first

  • @fredymm2509
    @fredymm25094 жыл бұрын

    It actually helped me a bit, thank you.

  • @Simoneadami
    @Simoneadami4 жыл бұрын

    WOW. I started a full immersion oh your videos 2 days ago. I tried the first to day didn't go very well. I tried this one as my second one and I did it! I will not tell how long it took, LOL but the result is awesome! Thanks so much for teaching so well!

  • @coladict
    @coladict4 жыл бұрын

    The alternative logic for reaching that 2 in the 8th column (starting around 6:40) is after you've already eliminated it from the 9th row, you can see direct pre-written 2s eliminating it from every other position in the column. So while the logic you describe is valid, and I certainly use it a lot, there's often an easier way that we miss.

  • @markogilchuyma

    @markogilchuyma

    Жыл бұрын

    Another alternative can be seen at 12:30. There is also a pair 17 in the first column of the first sector, this allows you to remove both options (17) from the cell that is just to the right of the 2 in the first sector, so that only the 4 option would remain in that cell. In case you didn't understand: There can't be 2 options forming a perfect quadrilateral. The pair 17 is in 3 vertices of this imaginary quadrilateral, so neither 1 nor 7 can be in the last vertex. Otra alternativa se puede ver en el minuto 12:30. Hay también un par 17 en la primera columna del primer sector , esto permite eliminar ambas opciones (17) de la celda que está justo a la derecha del 2 en el primer sector, por lo que solo quedaría la opción del 4 en esa celda. Por si no se entendió: No puede haber 2 opciones formando un cuadrilátero perfecto. El par 17 está en 3 vértices de este cuadrilátero imaginario, así que en el último vértice no pueden estar ni el 1 ni el 7.

  • @gposchman
    @gposchman Жыл бұрын

    I don't watch videos as often as I used to, but I continue to subscribe and support you on patreon. I check in with both of you occasionally, and I continue to enjoy sudoku. Thanks, and keep up the great work.

  • @adamr1812
    @adamr18123 жыл бұрын

    I haven’t done sudokus in years but found this channel the other day and kept watching because I found your voice so soothing. This was the first sudoku I tried doing myself, I got a little stuck at the beginning and then watched the video until 07:00 and were then able to solve the whole thing by myself. Felt so good! And I love your software, will probably buy the app later. Thank you for all your work!

  • @gracerc6154
    @gracerc61543 жыл бұрын

    I like to start methodically with filling in all one's possible in all boxes and all rows, then find all 2's, then 3's etc, also pencilling in the 2-square possibilities for each number as I go. Then I try to complete any nearly-filled row or box. Then check all 1's again, 2's etc.

  • @connorhamilton5707
    @connorhamilton57074 жыл бұрын

    Love the video. Very nice and clear explanations of the logic involved. My biggest takeaway though was your pencil marking method. I am stubborn and usually do that when I am having trouble going further, plus I brute force my way and put every possible number for every square before continuing. Your way is much more efficient and it is nice to know that it is recommended to do the marks as you go along.

  • @murahk123

    @murahk123

    4 жыл бұрын

    Connor Hamilton same. I find that when you pencil mark along the way, it makes the entire puzzle look much clearer. With too many pencil marks, it’s a little overwhelming and it’s hard to focus.

  • @gwenbernecker6094
    @gwenbernecker60942 жыл бұрын

    I am fairly new to sudoku - I’ve been doing the NYT easy puzzles over the past month. As an engineer I was wracking my brains looking at some of the much more complicated techniques and this beats them all. Thank you for clearing up that the identified pairs are in squares of 9 blocks only, not columns or rows. Now I’m going to practice.

  • @TheDive25
    @TheDive254 жыл бұрын

    I've been doing the Nikoli Expert book for the last few weeks and haven't had any problems. I was easily able to follow along with this video but didn't learn any "tricks" I didn't already know. Great video though for those starting out. It's cool I can kind of seem my progress as an "expert" puzzle solver. Thanks.

  • @Pyromonkey83
    @Pyromonkey834 жыл бұрын

    Great puzzle by the NYT. Lots of hidden pairs, triples, and x wing logic buried beneath. Very well crafted, even feels almost handmade at times. 9:10 on my solve this go around, I feel I should have been able to do better, but maybe one day I'll get there.

  • @LurqN-
    @LurqN-3 жыл бұрын

    You made me start learning sudoku so I can hopefully by the end of this year or June next year I can get to your level of understanding in puzzles. Took me 13:00min to solve my first easy classic sudoku with no knowledge. Let’s go! Thanks for the videos :)

  • @KingBaller06gaming

    @KingBaller06gaming

    3 жыл бұрын

    It took me 25 minutes roughly to solve an easily level Sudoku puzzle and now I can do Easy level in roughly 10 minutes, no mistakes. I did a Medium and that took around 17 minutes.

  • @eddiekorkis

    @eddiekorkis

    3 жыл бұрын

    Once you get better you will be able to do expert puzzles in 5. I do expert on iPad in that time. The iPad version of the game kids helps you. When you click on a number like 1 all the ones highlight. Makes it easier and faster to see other things. Good luck. It’s a great game. Play chess? Find me on chess.com. Greekjanus

  • @rohmilchgeniesser

    @rohmilchgeniesser

    3 жыл бұрын

    I've started doing sudokus a few days ago First I needed 20 min for a easy sudoku Today its under 5 min, its awesome how fast you get better

  • @lee...9098

    @lee...9098

    2 жыл бұрын

    you doing any better?

  • @frogandtoady

    @frogandtoady

    2 жыл бұрын

    How’s it going?

  • @sandracloke6268
    @sandracloke62682 жыл бұрын

    This is how I've been working my Sudoku puzzles, love these challenging and fun puzzles.

  • @rthatchet
    @rthatchet4 жыл бұрын

    I grew up with a pocket sudoku and always loved it Never learned how to do advanced stuff but followed along and you made it SO obvious I watched to get started, and when I was just stuck Then it clicked and everything unwound! Took me a frickin hour but I solved it with your help then finished your video, yes I appreciate the puzzle unwinding!

  • @tomtheultimatepro
    @tomtheultimatepro4 жыл бұрын

    27:05 Pretty proud of myself given I am generally not able to solve the sudokus from this channel.

  • @tiagocarreira99

    @tiagocarreira99

    4 жыл бұрын

    I did 44:57, but I'm still happy for the same reason :D

  • @ichliebebaeumeweilbaum

    @ichliebebaeumeweilbaum

    3 жыл бұрын

    @@tiagocarreira99 omg I got almost the same time xD 44:45

  • @BenAtTheTube
    @BenAtTheTube4 жыл бұрын

    I solved this before watching your video just to prove I could, but your method of corner-marking only numbers that can only go in two squares is faster than my time. I'll try it that way next time. Thank you!

  • @shanejett3550

    @shanejett3550

    4 жыл бұрын

    Yes I often use more that 2 number markings. I was thinking the same, maybe limiting to only 2 different numbers is better? These hard puzzles are relatively easy. Have u tried expert puzzles? I'm trying to find expert puzzles and advanced sudoku solving techniques videos.

  • @dwilliams6346
    @dwilliams63468 ай бұрын

    I'm self taught on Sudoku after seeing the puzzles my late Dad used to do which intrigued me. Sometimes I get careless and input a double mostly because I'm lazy and don't use a pencil with an eraser and attempt to do it mental. I'm going to buy some mini rubber tip pencil tomorrow and do them properly. Thanks for this.

  • @platypuz8068
    @platypuz80687 күн бұрын

    Watching you solve a sudoku is such a joy. I've learned so much from this channel.

  • @CoenBijpost
    @CoenBijpost4 жыл бұрын

    That lonely pencilmarked 6 was enough to drive my ocd absolutely crazy. Loved the video, though. The x-wing pattern has now been rammed into my consciousness really good. As has your pencilmark logic. I was trying to copy it from memory after seeing one video, but it turned into pencilmarking every single value that any of the cells could have, which made the sudoku a paint-by-numbers puzzle :) I have developed a love for sudoku all of a sudden, while I came here for the cryptic puzzles. The sandwiched sudoku app is so great! Keep the content coming ;)

  • @LilKitLen

    @LilKitLen

    Жыл бұрын

    I'm not the only one noticing that 6 :'v I just thpight he'd bang it out right there and then given that he'd just done the chain of the other 6 and 2 cells Edit: He came back to it and solved himself a nice 5, hooray :v

  • @tiederr
    @tiederr4 жыл бұрын

    I watched the video till 7:39, then it took 22:52 to complete this sudoku without help, this method is the best! Thanks! :D

  • @anniesmith2
    @anniesmith23 жыл бұрын

    Thank you.! I am now doing all the expert puzzles I threw in the recycle bin! I was on the right track but put too many numbers on the page and it got confusing. Keep it simple and it is easy! Many thanks for your video!

  • @ShoshiPlatypus
    @ShoshiPlatypus4 жыл бұрын

    Excellent tutorial. I’ve been stuck on intermediate level for a while. This is really helping me to advance! Will try your online app. I like the way you can add pencil marks in the 2 locations. Really helpful.

  • @neomorphicduck
    @neomorphicduck4 жыл бұрын

    ahh, now finally the reason for the two different numbering systems is clear to me! thanks for this so much!

  • @ValeriePallaoro

    @ValeriePallaoro

    4 жыл бұрын

    Yeah ... me too; total newbie and now - this much is clear (*winks*) can't say it's embedded in my brain; but it's nicer to follow the work out, knowing this next step beyond "try to number 1-9 in the box and in the lines" This is a great site.

  • @timdolan4591

    @timdolan4591

    4 жыл бұрын

    Most of my work is paper. I keep the candidates in the “proper” spots but underline showing the importance

  • @prschuster
    @prschuster4 жыл бұрын

    I did figure out, on my own, the trick of putting potential numbers in the corners when I narrowed down the possibilities to two squares per 9 square block. Then I would attack horizontal or vertical lines that were almost full. I can do medium difficulty sudoku puzzles, but the hard ones are still over my head.

  • @Stettafire

    @Stettafire

    3 жыл бұрын

    I can do most difficult ones over 2 hours. Occasionally there is one I outright can't solve. That's happening less often as I'm learning more about the logic behind it

  • @Zilvaras2

    @Zilvaras2

    3 жыл бұрын

    @@Stettafire Is there a universal system for telling which puzzle is easy, medium and hard? I think that's completely subjective. For example, I have an app with 5 levels, and hard (4/5) is not that hard at all, leaving extreme (5/5) to be really hard.

  • @story1234
    @story12344 жыл бұрын

    I am stuck on this for few hours. I just started with sudoku though. I finally watched this video learned some techniques and logic.

  • @jb6712
    @jb67124 жыл бұрын

    Methinks I'll have to save this one and come back to it in a couple months; I only just learned the basics of solving sudoku puzzles a few days ago, so am not ready for one like this yet. Looks like an excellent tutorial, and I look forward to watching it soon.

  • @rogervizion2556
    @rogervizion25564 жыл бұрын

    I really like the way he explains to people who don't know this game. (I did it with a screen shot and Paint in less than 13 mn but, and here is the difference, whithout any stress of camera.)

  • @gresach
    @gresach4 жыл бұрын

    Thanks for your very clear video. One trick that I sometimes find useful but have never seen discussed is available at 12.40. You have 17-pair in the middle left square. There are three empty cells in the top left square, including 1 pencilled in two cells of row 2. We immediately know that 7 cannot appear in either of those two cells, because if it did, the solution could never be unique. We could never resolve the two 17 pairs. So can write 7 in the one remaining empty cell. A similar idea is very useful solving chess compositions.

  • @josephnation9063

    @josephnation9063

    4 жыл бұрын

    For the NYT, uniqueness may be a safe assumption, since most better algorithm generators will require a unique solution, but for a random Sudoku or for a tutorial where people will apply the techniques elsewhere, it doesn't really make sense to teach since it won't always hold.

  • @a.nichiporovich
    @a.nichiporovich2 жыл бұрын

    This a great example of solving Sudoku. I used it to learn basics. Thanks a lot.

  • @cagedraptor
    @cagedraptor4 жыл бұрын

    never really done Sudoku but it looks like a good way to spend some time. You have a really realistic and logical progression with it.

  • @johnlloydaleta206
    @johnlloydaleta2063 жыл бұрын

    12:12 !! months of watching and tons of playing really paid off

  • @insellacolbradipo5322

    @insellacolbradipo5322

    2 жыл бұрын

    I did 20:54 because I messed up something somewhere and had to restart, but I'm very happy. These videos really help. I also got their app and it has tons of very challenging ones :D

  • @pyro_mania67
    @pyro_mania674 жыл бұрын

    When you took care of that right corner box's 6 my anxiety went down lol I knew as soon as you did that the puzzle would quickly resolve itself

  • @johndudash2579
    @johndudash25794 жыл бұрын

    Thanks, now I understand why you # the boxes, instead of confusion , using it as a tool, appreciate that!

  • @MrLenoir99
    @MrLenoir995 ай бұрын

    I hoped to learn a trick but I see he toils along just as I do. Which is comforting.

  • @jackschilder
    @jackschilder2 жыл бұрын

    Up to 14:06 all was familiar to me. I think I never thought of putting the combination 4 9 there. The trick starting at 4:26 is very frequent in this puzzle. I have done hundreds of sudokus (level 7) and I have never seen so many cases of that situation in one puzzle.

  • @markwilding3828
    @markwilding38284 жыл бұрын

    I thought I was improving my logic skills and becoming more intelligent... realised I have only cloned myself into a poor facsimile of Simon.

  • @mttrips4429
    @mttrips44294 жыл бұрын

    Wow, thanks for the info. Cheers.

  • @thomaswilke6312
    @thomaswilke63124 жыл бұрын

    Another incredibly educational and entertaining video

  • @lefandeluimeme
    @lefandeluimeme3 жыл бұрын

    9:33 for me For the first time, I was faster than Simon and I'm so happy about it !

  • @RaindropsBleeding

    @RaindropsBleeding

    3 жыл бұрын

    I'm seriously unsure if he legitimately took this long or if he was slowing down for instructional purposes. this felt like a very slow pace for him.

  • @lefandeluimeme

    @lefandeluimeme

    3 жыл бұрын

    @@RaindropsBleeding Yes, I know But still, let me be happy and proud about it !

  • @rafiqislam4478

    @rafiqislam4478

    Жыл бұрын

    Why it was 4. Pls tell me.

  • @markogilchuyma
    @markogilchuyma Жыл бұрын

    An alternative can be seen at 12:30. There is also a pair 17 in the first column of the first sector, this allows you to remove both options (17) from the cell that is just to the right of the 2 in the first sector, so that only the 4 option would remain in that cell. In case you didn't understand: There can't be 2 options forming a perfect quadrilateral. The pair 17 is in 3 vertices of this imaginary quadrilateral, so neither 1 nor 7 can be in the last vertex. Una alternativa se puede ver en el minuto 12:30. Hay también un par 17 en la primera columna del primer sector , esto permite eliminar ambas opciones (17) de la celda que está justo a la derecha del 2 en el primer sector, por lo que solo quedaría la opción del 4 en esa celda. Por si no se entendió: No puede haber 2 opciones formando un cuadrilátero perfecto. El par 17 está en 3 vértices de este cuadrilátero imaginario, así que en el último vértice no pueden estar ni el 1 ni el 7.

  • @jeffjo8732

    @jeffjo8732

    Жыл бұрын

    I was going to point out the same thing - it would have "exploded" the puzzle sooner. But based on how seldom this trick is needed for published sudoku, I wonder how many designers recognize it as a valid trick that can be used by solvers. Which is surprising, because knowledge of it is needed for the design of a valid puzzle. This might be easiest to see from the finished grid, at 17:15. A designer will start from such a finished grid, and remove numbers that leave the puzzle solvable. Look at the positions of the 3 and the 4 in top-right and bottom-right boxes. When deciding which numbers can be removed, and still have only one valid solution, the designer must leave at least one of these four numbers in. (In this case, both were left in the top-tight box.) Otherwise, the solver can find two solutions by reversing the 3's and 4's. But it is always something I look for when I discover a fixed-pair in either one column or one row of a box. And the trick can even be extended in two ways: First, at 15:23, a fixed-pair of "14" was discovered in the center column of the bottom-right box. But it is completes a quadrilateral with a "48" pair in the bottom-left box. This means that there can't be a "18" pair in a similar quadrilateral. (In this case, a 6 already prevents it.) Second, you can't have three complete rows (or columns), with the same filled-in numbers, in three boxes along a column (or row).

  • @demetrioalbidrez684
    @demetrioalbidrez6842 жыл бұрын

    I 'm self taught , a long time ago !! This video. is very helpful to many people !! Keep up the great work !!!

  • @nickchester3275
    @nickchester3275 Жыл бұрын

    Perfect! Thank you. It makes such a wonderful change to have someone speak clearly and intelligently (sorry, but I'm a Brit and I appreciate both the tempo and the accent...) and, of course, the overpowering logic laid out so clearly. As good as a good movie - oh, and I'm a techie, too!

  • @lesleyrowland4754
    @lesleyrowland47542 жыл бұрын

    Realised im better at suduko than i thought

  • @Inferxno
    @Inferxno4 жыл бұрын

    5:58 Me: INDEED, that’s what I was thinking

  • @GordonStainforth

    @GordonStainforth

    4 жыл бұрын

    He's so dim he's off the scale. The way he does it is just so slow and laborious.

  • @h4h4productions73

    @h4h4productions73

    4 жыл бұрын

    Gordon Stainforth lol hes an extremely skilled sudoku player hes just trying to explain everything logically and go slow for beginners

  • @matt03301959
    @matt03301959 Жыл бұрын

    You remind me of my calculus instructor in college. Everything looked so easy and natural when was explaining things, then I went home to study and just drew blanks. It's got to be done that way, though, and eventually things start clicking. Everything you go over in this video is familiar to me; now I just need to bring myself to use pencil marks. Thanks for excellent instruction :)

  • @genesiscda4847
    @genesiscda48472 жыл бұрын

    You explain things really well. You’ve upped my sudoku game with only two videos.

  • @B3Band
    @B3Band3 жыл бұрын

    I took a shot every time he said "ahhh" I'm dead of alcohol poisoning now.

  • @brettmakoviney7120

    @brettmakoviney7120

    3 жыл бұрын

    Lol Ha ha ha ha good one

  • @lungflogger9
    @lungflogger94 жыл бұрын

    to do this puzzle AND talk the method at the same time.....pretty awesome.

  • @fodank
    @fodank4 жыл бұрын

    Pure good content. A miracle. Thank you.

  • @robertkavanaugh1899
    @robertkavanaugh18994 ай бұрын

    Amazing, and thank you. I am new at sudoku. I will be watching this video over and over. You rock!

  • @intiyazkhan2910
    @intiyazkhan29104 жыл бұрын

    Thanks for clarifying everything in a really nice way, Do you have a sandwich sudoku puzzle app for android

  • @Pumbear

    @Pumbear

    4 жыл бұрын

    They have now

  • @VVheeli
    @VVheeli4 жыл бұрын

    I’m listening along while trying to do my own puzzle. Like, I should know all these concepts and tricks. I just can’t find them on the board...

  • @ugxsan

    @ugxsan

    4 жыл бұрын

    You sort of develop a pattern of what to look at and an eye for coincidences. Some quicker than others. You just have to know what to look for.

  • @Steve-yx1xj

    @Steve-yx1xj

    4 жыл бұрын

    I don't understand this 'concepts and tricks thing', be systematic, be logical , few sudokus take more than 10 minutes. This ain't maths, it's logic and if you do logic then the world is your lobster.

  • @angelmendez-rivera351

    @angelmendez-rivera351

    4 жыл бұрын

    Steve Muscato Exactly.

  • @cocoa_cake
    @cocoa_cake2 жыл бұрын

    this taught me a couple tricks I didnt realize I could use even though I used to play this game every day for a year straight! might get back into the game now

  • @j_e_hill
    @j_e_hill2 жыл бұрын

    That six you overlooked in the top right was killing me! Liked the video. I need to get back to sudokus. Your software looks nice to use.

  • @papalog08
    @papalog083 жыл бұрын

    I've done sudoku before. I completely understand it as you go along. I'm answering with you, I understand this 100%. Now I have to do it alone and have no fucking clue what's happening. That's college math in a nutshell.

  • @thinkfirst6431
    @thinkfirst64314 жыл бұрын

    Right right then. You sound like the sorting hat at Hogwarts.

  • @mikeking7710
    @mikeking77102 жыл бұрын

    I tried the puzzle before watching, and although it took me longer, I was able to complete it. However, the discussion you had on the 2's at about 7 minutes in, that's actually where I started with my solving.

  • @douginorlando6260
    @douginorlando62603 жыл бұрын

    Love your logic and especially your notation methodolgy

  • @odolany
    @odolany4 жыл бұрын

    the solving at this level doesn't seem difficult to me. but the speaking during solving is like craazy hard. wow!

  • @Rath_9
    @Rath_94 жыл бұрын

    I used a lot of the same methods during my solve. Particularly the 7 and 2’s I think we’re critical moves. However besides for those main steps I solved this entirely different lol

  • @user-ig3jn4kn6x
    @user-ig3jn4kn6x2 ай бұрын

    Absolutely brilliant! I stopped playing coz i couldn't figure out what's nx... Now I'm hooked again!

  • @EmilyYebananapie
    @EmilyYebananapie3 жыл бұрын

    Very thorough explanations thank you!

  • @HeidiSvenson
    @HeidiSvenson4 жыл бұрын

    To all of you who chimed in here at the comments section to say something like: "This was way too easy! I solved it in my sleep - and not even during my REM cycle!" (...or something similar); may I ask what your motivation might have been to watch a tutorial so clearly beneath your superior capabilities? Surely your time spent here with us simpletons and away from the DIY particle accelerator lab you are building in your garage is not worth your efforts? I'm quite sure you modern-day gods of thought have more lofty humanatarian pursuits than those involving those of my ilk. As you know, belittlement purely for its own sake is obviously beneath you and a rather pedestrian pasttime, is it not? Excellent. I'm so glad we agree. So, leave us now to our sad pathetic existence and our endless, pointless scratchings and scrabblings in the mud. Think no more of our lot in life. We are just grateful and humbled by your presence - however fleeting. Go now! You must harness your superior cerebral gifts lest they be squandered one moment more on us - the simple, the undeserving, the Great Unwashed. May God bless you and your beautiful brain.

  • @spiv

    @spiv

    4 жыл бұрын

    i was hoping to see examples of x-wing patterns or swordfish strategies, those are all still beyond me.

  • @howrrahamed1727

    @howrrahamed1727

    4 жыл бұрын

    Some facts

  • @nunyabizness607

    @nunyabizness607

    4 жыл бұрын

    Just as I'm sure you have better things to do than whine about mindless zealots with superiority complexes. Your disdain falls on deaf ears and was every bit as juvenile and unnecessary as the musings of those you seek to shame. .

  • @kayla7928

    @kayla7928

    4 жыл бұрын

    I'm not even gonna read that whole thing but go off my guy

  • @shanejett3550

    @shanejett3550

    4 жыл бұрын

    @@nunyabizness607100% agree. Sounds like a narcissist trying to get other narcissists to fight with. Some people like confrontation.

  • @jackiefoxall1947
    @jackiefoxall19474 жыл бұрын

    After missing the "6" I found it difficult to concentrate.

  • @timbarlow1674
    @timbarlow16743 жыл бұрын

    Absolutely brilliant, I learn so much from your videos, you are some clever cookie, I take my hat of to you!

  • @kennylakits4093
    @kennylakits40934 жыл бұрын

    This was a big help. I can do the medium puzzles somewhat easily but really struggle with Hard & Evil ones. Big THX

  • @gthegadgetguy9703
    @gthegadgetguy97033 жыл бұрын

    AT 14:37 I INSTANTLY KNEW WHERE TO PUT THE OTHER FIVES AND I GOT SO MAD WHEN HE DIDNT PUT THEM IN. I WAS GENUINELY YELLING AT MY COMPUTER. I CHEERED WHEN HE FINALLY PUT THEM IN.

  • @playgroundchooser
    @playgroundchooser4 жыл бұрын

    13:10 for me 😁. But holy crap I went a different route.

  • @C3NT124LxT1M3
    @C3NT124LxT1M34 жыл бұрын

    that was an awesome xwing heavy puzzle, had fun solving it!

  • @yuvalgordonzin
    @yuvalgordonzin4 жыл бұрын

    I did it in 12 min and 45 seconds. I like your videos, great way to find new tricks!

  • @nateriver1005
    @nateriver10053 жыл бұрын

    The "6" would have been the obvious cryptic break for me, followed with the frequency rank of numbers

  • @lisagordon6355
    @lisagordon63554 жыл бұрын

    So what was THE TRICK.? 8 x wing? Thank you

  • @michaelmcgee6827
    @michaelmcgee68274 жыл бұрын

    I went through your videos to do these puzzles *bored at 4am* and I found this one relatively easy. But I still have a lot to learn as a lot of these puzzles take me time. Keep the content up tho!

  • @AtreidesHeir
    @AtreidesHeir4 жыл бұрын

    Thank you!! This is a big help!