Sudoku Demonstration - Skyscraper Technique (Example 01)

Ойындар

As I've continued to grow in my ability to solve Sudoku puzzles, I've also continued to seek out more advanced puzzles to push and challenge myself to learn and understand techniques that are necessary in order to complete "Hard+" puzzles.
Keys to finding and using a skyscraper:
1. Look for two columns or two rows where only two possible candidate exist for a number (ie: Columns 1 and 8 have two cells each where a 3 is possible)
2. Identify if each of the four cells you've spotted is in its own box (ie: as you look at each of the four individual cells, the other three do not exist in the same box)
3. Verify that the four cells form a shape where you can see a "base" (two cells are directly in line with each other; in the same row or same column), and the other two cells up or across from it do not line up directly (these two staggered cells for the "roof tops"). To double check yourself, look at where you think you've spotted a "base" and then look up or across to where the other two cells are. If the other two cells also line up, then you have incorrectly spotted the base. Pick another set of cells that are directly in line with each other and do the same test to verify if the cells across from it are directly in line with each other, or if they are staggered. Once you verify that you can see a base and a staggered top, you've correctly identified the correct aspects of the skyscraper.
4. Now focus on the roof tops. Start at the lowest part of the roof top - from that cell, looking across the row or column towards the highest part of the roof top, look for cells where other possible candidates exist that are visible by both roof tops. Any cells you find can be elimated as possibilities. Do the same thing with the upper roof top now - Look across the row or column towards the lower roof top and find cells where other possible candidates exist that are visible by both roof tops. These can also be eliminated.
NOTE: Whether you look across rows or coumns when dealing with the roof tops will depend on how the skyscraper is positioned on the board. This is why I state in step 4 to look across the row or column where the roof tops are because it will depend on how the skyscraper is oriented. If the base runs parallel to the bottom of your puzzle grid, then the roof tops will sight each other across rows. If the skyscraper is oriented 90 degrees clockwise or counter-clockwise, then the base will be running parallel to the left or right side of your puzzle grid, which means that your roof tops will sight each other across columns.
If anyone watching this video would like to see other examples of this particular technique, let me know and I'll post one or more videos demonstrating it. Or, if you think I did a crappy job and you'd like me to do better, let me know what I can do to improve :).
If you'd like to keep growing in your Sudoku skills, but you're not quite ready for this level, keep practicing beginner to intermediate puzzles until you feel more comfortable and confident to take on new challenges like this and other techniques I'll be demonstrating in the months to come.
I'd like to give a shout out to Tiffany ( / misskity6 . She has some great videos on her channel where she demonstrates beginner to intermediate techniques that are crucial to building a solid foundation.
I'd also like to give a shout out to Angus Johnson for making the game "Simple Sudoku", which is the game I was using to demonstrate the skyscraper technique. Check out his site:
www.angusj.com/sudoku/

Пікірлер: 187

  • @MicheleBloodphd
    @MicheleBloodphd6 жыл бұрын

    Your teaching skills are top notch. You explain everything clearly and logically, and use a step-by-step approach. Exactly what I needed!

  • @Shuey187

    @Shuey187

    6 жыл бұрын

    Thank you so much Michele! I hope I can upload more videos in the near future :)

  • @jerryblood9554

    @jerryblood9554

    6 жыл бұрын

    Where are you from Michele?

  • @marielacroix9177

    @marielacroix9177

    4 жыл бұрын

    yg8y98ghg8,yyg8yyig,8gg8xuy9g8g8u,ggg,8ug8yuyxuyuuyixcg,uxyghgyxgu,y y y y 789 y y 789 u 9 you y 88 y y it y 88 789 88 88 FF 789 you 88 789 78 88 88 88 789 99 88 88 88 y you 88 y guy 78 88 y 8h00 guy 88 it y 88 88 88 88 y 88

  • @angenoellesicke6568

    @angenoellesicke6568

    2 жыл бұрын

    @@Shuey187 vxHh JJJKNJ

  • @headsupdisplay2189
    @headsupdisplay21893 жыл бұрын

    Shuey187: Your series on skyscrapers is one of the best I've seen. Good examples and explanations. Thank you.

  • @donaldmorneau8043
    @donaldmorneau80432 жыл бұрын

    For the life of me, I could not "see" (even after watching other videos) which numbers to take out and which ones to leave in until I watched this one. You are a great teacher!! Thanks a million!!!

  • @Shuey187

    @Shuey187

    2 жыл бұрын

    Glad to hear that Donald! Thank you for the feedback and support :).

  • @christinaelliott1087

    @christinaelliott1087

    5 ай бұрын

    Same here, I was at a complete loss as to WHY this method worked. I get it now, thank you !

  • @ashleywhispers4331
    @ashleywhispers43313 жыл бұрын

    Your the first person that I’ve been able to understand an advanced technique from. I have a hard time learning I guess but you really described it straight forward no fluff. I appreciate that soooooo much!

  • @Shuey187

    @Shuey187

    3 жыл бұрын

    SO good to hear Ashley! Thank you for the feedback and I'm glad it helped! :)

  • @sharonshookup
    @sharonshookup3 жыл бұрын

    Finally !! Someone who explains the skyscraper properly. Thank you.

  • @Shuey187

    @Shuey187

    3 жыл бұрын

    Thank you so much, and I'm happy it helped! :)

  • @FazalFariz
    @FazalFariz5 жыл бұрын

    Who else ran to their stuck sudoku puzzles after this video?

  • @Shuey187

    @Shuey187

    5 жыл бұрын

    :D

  • @SudokuGuy
    @SudokuGuy9 жыл бұрын

    Well done Shuey. I agree with Oumarou.

  • @Shuey187

    @Shuey187

    9 жыл бұрын

    Sudoku Guy Thank you :)

  • @ntltle6725
    @ntltle67253 жыл бұрын

    Thank you for your clear and concise video. Awesome job!

  • @gordonpickett4103
    @gordonpickett41034 жыл бұрын

    Thank you Shuey for your program recommendation

  • @aliciabrillante
    @aliciabrillante4 жыл бұрын

    You explained this complicated technique crystal clearly!!!! Thank you so much!

  • @Shuey187

    @Shuey187

    4 жыл бұрын

    Thank you for the feedback! I'm happy to hear that it helped :)

  • @ChiTownsFinest1225
    @ChiTownsFinest1225 Жыл бұрын

    Thank you for this video! I found a new hobby and im so excited to learn about all these advanced skills! Im watching various skyscraper videos to really hammer it in and I gotta say, yours is the best. Im good now lol

  • @Shuey187

    @Shuey187

    Жыл бұрын

    Thank you so much for the support, and I'm really happy that my videos are helping you! :)

  • @beer1for2break3fast4
    @beer1for2break3fast46 жыл бұрын

    Short sweet and to the point. I like it!

  • @Shuey187

    @Shuey187

    6 жыл бұрын

    Thanks beertrain! :)

  • @RealScarlett33
    @RealScarlett3310 жыл бұрын

    I'm super excited to find your channel, Shuey! Misskity6 taught me to play sudoku, and I've been hooked for years. I can't wait to learn your advanced techniques. :)

  • @Shuey187

    @Shuey187

    10 жыл бұрын

    Thanks Scarlett! If you have any specific ideas or questions you want to ask, don't hesitate to let me know :)

  • @RealScarlett33

    @RealScarlett33

    10 жыл бұрын

    Very good. Will do. Thank you! :)

  • @sampathkumar-ej7xl
    @sampathkumar-ej7xl4 жыл бұрын

    Thanks for the nice explanation. I finally got what people referred to as skyscraper. Being new to these terminologies it was a bit confusing so far.

  • @clairacres4650
    @clairacres4650 Жыл бұрын

    Finally! I had to re-watch about three times but it's sunk in now. Thank you 😊

  • @Shuey187

    @Shuey187

    Жыл бұрын

    I'm glad it was helpful to you Clair! :)

  • @claudegiguere8731
    @claudegiguere8731 Жыл бұрын

    Wow! Right to the point, very clear, this tutorial is great! Many thanks !

  • @Shuey187

    @Shuey187

    Жыл бұрын

    So glad it was helpful, thank you! :)

  • @drdark9134
    @drdark91342 жыл бұрын

    Understood and enjoyed, thank you.

  • @YouKnowMeDuh
    @YouKnowMeDuh2 жыл бұрын

    Ahh. Didn't know what was meant by what is "seen" by the cells until you explained it. Wanted to be sure I wasn't confusing myself :) Thanks!

  • @Elderanix
    @Elderanix5 жыл бұрын

    wow! now I will never get stuck again! thanks!

  • @Loza422
    @Loza4226 жыл бұрын

    Thank you for this!!

  • @sreenivaspai5066
    @sreenivaspai50663 жыл бұрын

    Very nice demonstration. Short and crisp

  • @Shuey187

    @Shuey187

    3 жыл бұрын

    Thank you, glad it helped! :)

  • @beflygelt
    @beflygelt7 жыл бұрын

    See on both sides.. like Chanel thanks a lot for this explanation, very helpful!!

  • @MegaBadassassassin
    @MegaBadassassassin8 ай бұрын

    You explain in such a clear way I almost feel dumb for not having noticed it before hahaha

  • @Shuey187

    @Shuey187

    8 ай бұрын

    Hehe, nah! I learn best by seeing, so I'm glad that my video and explanation was able to help you! Thank you so much for the kind words 💗

  • @jeffciaccio2463
    @jeffciaccio24638 жыл бұрын

    Hey, love the videos on the advanced techniques. What software are you using that allows you to highlight the cells? What software are you using when you are shooting the video that allows you to just show the Sudoku screen without all the rest? Thanks for the great explanations and high quality videos. Now I'm off to do more puzzles.

  • @Shuey187

    @Shuey187

    8 жыл бұрын

    +Jeff Ciaccio I use "Hodoku" now (much more robust than the previous software that I was using in this video. The software I use to record the screen is Camtasia Studio.

  • @CapitanSodoku
    @CapitanSodoku9 жыл бұрын

    you've made a great video. I loved the explanation. bye

  • @jamilaa644
    @jamilaa6445 жыл бұрын

    Very well explained 👍 THANK YOU SO MUCH 🌹

  • @Shuey187

    @Shuey187

    5 жыл бұрын

    Thanks for the feedback - glad it helped you! :)

  • @DiveDiva2007
    @DiveDiva20075 жыл бұрын

    Brilliant - not seen this before - I’m familiar with the X wing and its very similar so that will be very useful, thanks.

  • @Shuey187

    @Shuey187

    5 жыл бұрын

    Glad to hear it, thank you! :)

  • @desse56
    @desse568 жыл бұрын

    Does this work also if the "roof top" cells are more than one row apart (vertically in this case)? My logic says it works as long as they're in the same horizontal row of 3x3 columns (example, the roof top to the right moved up one cell), but I'm not sure...

  • @Shuey187

    @Shuey187

    8 жыл бұрын

    Absolutely! :) If the top right cell was in r4c8 instead of r5c8, it would still be able to see the same "house" of cells that the r6c1 cell can see.

  • @stacybradykaufman2521
    @stacybradykaufman252110 жыл бұрын

    That is so very helpful. Thank you!

  • @Shuey187

    @Shuey187

    10 жыл бұрын

    My pleasure Stacy, glad it helped :)

  • @davysuisse
    @davysuisse7 жыл бұрын

    Well done ! Clear explanation !

  • @Shuey187

    @Shuey187

    7 жыл бұрын

    Thanks Davy! Glad to hear it helped :)

  • @keithbellic2629
    @keithbellic26298 жыл бұрын

    Never understood Sashimi Xwings until now. Thanks for the help.If anyone out there has android devices, I highly reccomand Sudoku4ever plus. The hint system is the best I've ever seen in a sudoku app and it allows for four different colouring tools. But nothing beats watching vids like these. XD

  • @Shuey187

    @Shuey187

    8 жыл бұрын

    +Keith Bellic Thanks Keith! :)

  • @davetaylor2449

    @davetaylor2449

    7 жыл бұрын

    The hint system might be nice, but when it just states this, this and this, with no good explanation it's hard to learn,be specially about the links.

  • @SudokuGuy
    @SudokuGuy6 жыл бұрын

    Hi Shuey What computer program are you using. I have found that yours is excellent.

  • @Shuey187

    @Shuey187

    6 жыл бұрын

    Thank you :). It's called Hodoku and it's free (hodoku.sourceforge.net/en/index.php)

  • @bobgrace2792
    @bobgrace27927 жыл бұрын

    absolutely beautiful. Great explanation!! Just like an X-wing. I can't believe I hadn't seen this before!! Thank you.

  • @Shuey187

    @Shuey187

    7 жыл бұрын

    So happy it helped you out! :)

  • @synthesisshort5622
    @synthesisshort56227 жыл бұрын

    Correct me if I'm wrong but a number can 'see' itself along its row and column when outside of its own cube and in any direction within its own cube. Thanks for the demo!

  • @priscillawilliams4858
    @priscillawilliams4858 Жыл бұрын

    Wow thanks!! That made it so easily understandable

  • @Shuey187

    @Shuey187

    Жыл бұрын

    So glad to hear that, thanks for sharing! :)

  • @priscillawilliams4858

    @priscillawilliams4858

    Жыл бұрын

    @@Shuey187 I just tried this technique on a medium puzzle and managed to get it done with only one mistake when I was averaging 4-6 per puzzle! Thanks!

  • @nicktrousers
    @nicktrousers10 жыл бұрын

    nice didnnt know of that one

  • @paulmoses8170
    @paulmoses81706 жыл бұрын

    Thanks, very informative. Also, what is the puzzle software?

  • @Shuey187

    @Shuey187

    6 жыл бұрын

    Thank you :). It's listed at the bottom of the video description. I use a newer/better software now though; it's called "Hodoku".

  • @timmy610387
    @timmy6103875 жыл бұрын

    Excellent

  • @Shuey187

    @Shuey187

    5 жыл бұрын

    Thank you! :)

  • @hikmatmarashdeh2293
    @hikmatmarashdeh22935 жыл бұрын

    Thanks a lot..

  • @SudokuGuy
    @SudokuGuy6 жыл бұрын

    utHi Huey, I am impressed with your explantions and the computer program you are using. What is the computer program. I'd be happy to give you credit.

  • @Shuey187

    @Shuey187

    6 жыл бұрын

    Thank you :). Hopefully you saw my reply in the other video where you asked the same question; the program is called Hodoku :).

  • @SudokuGuy

    @SudokuGuy

    6 жыл бұрын

    Unforunately I tried your yrl and it didn't work. Tthanks for trying anyway!

  • @Shuey187

    @Shuey187

    6 жыл бұрын

    Just Google "Hodoku". The software is free to download and use.

  • @aegyoevol
    @aegyoevol7 жыл бұрын

    for the skyscraper, does the cell out of place from the rectangle shape have to be 1 space up or could it be 2 spaces up?

  • @Shuey187

    @Shuey187

    7 жыл бұрын

    It can be 1 or 2 spaces (as long as it's in the same house). See this example, starting at around the 5:15 mark: kzread.info/dash/bejne/mHaHtayum5ueZdY.html

  • @sgarcata
    @sgarcata10 ай бұрын

    Well done

  • @Shuey187

    @Shuey187

    10 ай бұрын

    Thank you :)

  • @jovosedlar
    @jovosedlar8 жыл бұрын

    good job, actually excellent job, Shuey187 thank you

  • @Shuey187

    @Shuey187

    8 жыл бұрын

    +Jovo Sedlar My pleasure Jovo, I'm glad it helped :)

  • @JoshMariana
    @JoshMariana5 жыл бұрын

    Thanks so much, can you explain if we could also eliminate the 3s in r8c3 and r8c7? Thanks again!

  • @Shuey187

    @Shuey187

    5 жыл бұрын

    When finding and using skyscrapers, only the "rooftop cells" can be used to eliminate candidates. The X-Wing technique is where you can use all four cells to eliminate candidates. Hope that helps :)

  • @JoshMariana

    @JoshMariana

    5 жыл бұрын

    Thank you!!!

  • @povrtsux1
    @povrtsux14 жыл бұрын

    Nice

  • @misskity6
    @misskity610 жыл бұрын

    awww thanks Shuey. That's so sweet of you :)

  • @Shuey187

    @Shuey187

    10 жыл бұрын

    Right on! I am looking forward to getting more people to check out your videos, and hopefully the two of us will be able to get more people into Sudoku in general :)

  • @photographybynicolen

    @photographybynicolen

    10 жыл бұрын

    I am in condition to LEARN MORE! I will go and see if you misskitty will accept my offer ... Facebook here I come.

  • @oumaroudia
    @oumaroudia9 жыл бұрын

    OK Shuey by watching it more carefully and by watching Example 02, I got it. I know over repeating can drive the geniuses nuts but for the common people it helps and they are the majority;)! Thanks a whale!

  • @Shuey187

    @Shuey187

    9 жыл бұрын

    My pleasure :)

  • @brianlthatcher
    @brianlthatcher7 жыл бұрын

    I have watch most of your video. On very hard puzzles, Extreme puzzles, I'm getting stuck. I have seen things like, "naked triple". on the hint column. Any video on things like that?

  • @Shuey187

    @Shuey187

    7 жыл бұрын

    Nope, but I could certainly put together some videos of things like that, as well as quads. I'm not sure how soon I could get some videos created, but I'll definitely make a note of this request and do my best to get something up in the months to come! :)

  • @kennybealljr955
    @kennybealljr9553 жыл бұрын

    Love your teaching. I am having some trouble with one I am stuck on. Maybe you can show me where I can go from here. If it’s not too much trouble. How can I send you a picture of it?

  • @Shuey187

    @Shuey187

    3 жыл бұрын

    I'd be happy to help! :) Send it to johnnyshu@hotmail.com

  • @theeclecticbanjo
    @theeclecticbanjo7 жыл бұрын

    Can you better explain what you mean by the cells seeing other cells? Is there sight include all cells in the row, column, and box that they're in?

  • @Shuey187

    @Shuey187

    7 жыл бұрын

    Sure :). Review this new comment I posted and see if that helps: kzread.info/dash/bejne/n2t4r7uEd7a_fbg.html&lc=z232zzwjnqr0gh2y004t1aokgsxlejt0snf2w4pzg0qtbk0h00410.1490738799282011 Here's a brief synopsis as well: Cells can "see" each other if they're in the same house, same row or same column. If two reference cells are not in the same house, then they would either be able to see each other either by row association or column association. I hope that helps :).

  • @timquick9554
    @timquick95545 жыл бұрын

    I am starting to comprehend these more difficult methods of solving but how in row 6 how did you rule out the 3 in columns 2 and 8 to isolate and find your skyscraper?

  • @Shuey187

    @Shuey187

    5 жыл бұрын

    I'm not sure I understand what you're asking :(. Are you asking how I got to the point where I found the skyscraper? (Prior to using it to rule out other candidates?)

  • @jimkyle8008
    @jimkyle80086 жыл бұрын

    I have a question. At the start of the video we are shown four cells highlighted in green. The right-hand middle block contains the highlighted possibilities 2, 3 and 4. Immediately below this cell is a cell containing 1 and 2. Why can this cell not contain a 3 as a possible number? After all, there are no other definite 3's in that row or column.

  • @Shuey187

    @Shuey187

    6 жыл бұрын

    There's actually a definite 3 in row 6 (either in r6c1 or r6c9) which rules out the possibility of a 3 in r6c8. A 3 has to exist in either r6c1 or r6c9. And there's also a definite 3 in column 8 (either in r5c8 or r8c8) which rules out the possibility of a 3 in r6c8. A 3 has to exist in either r5c8 or r8c8.

  • @pineapplewafers
    @pineapplewafers9 жыл бұрын

    What program are you using to play? I have a few, but since I am learning, I would like one that highlights the numbers when I click on one that is already filled in and I can not seem to find a program that does that other than on my phone.

  • @Shuey187

    @Shuey187

    9 жыл бұрын

    pineapplewafers I actually use a different program now than what I was using in this video; it's called Hodoku. As far as what to use on a phone, I'm not sure since I don't play sudoku on my phone :-/.

  • @pineapplewafers

    @pineapplewafers

    9 жыл бұрын

    well no, i was looking for something on my pc... i will check out Hodoku, thank you :)

  • @oumaroudia
    @oumaroudia9 жыл бұрын

    At 3:10 you say: "a 3 has to be here or here in this top section..." How is that? I am sure it is true but can you explain why exactly? Thanks!

  • @Shuey187

    @Shuey187

    9 жыл бұрын

    Sure :). The two columns that form the skyscraper only have a possibility of a 3 in two places (and those cells are highlighted). The cells that form the "top section" will dictate where other 3s can no longer exist, since the two 3s that form the top of the skyscraper are the only two places where a 3 can exist. I hope this helps :).

  • @woodchuk1
    @woodchuk110 жыл бұрын

    You can also call this a Sashimi X-Wing...you may see it described under that name as well.

  • @zerocoll20
    @zerocoll202 жыл бұрын

    But you could also use X-wing in another square. Those rules would be incompatible ?

  • @davetaylor2449
    @davetaylor24497 жыл бұрын

    Does this also apply to the two lower green squares and what threes they can see?

  • @Shuey187

    @Shuey187

    7 жыл бұрын

    Hi Dave, thanks for the question and for checking out my video :). In the case of skyscrapers, the only cells that can be used to 100% rule out other cell candidates are the "roof tops" of the skyscraper. The "base" cells cannot be used to guarantee ruling out other candidates. That particular elimination method is only applicable in X-Wing scenarios. Sudoku methods are a lot like math. They may not always make 100% sense when you're learning them, but as long as you know the rules and when/where they can be applied, you can't go wrong ;) Hope this helps!

  • @davetaylor2449

    @davetaylor2449

    7 жыл бұрын

    Thank you it does help, and your explanation gives true meaning to method to this madness. It seems to apply to sudoku exclusively.

  • @Walid1992

    @Walid1992

    7 жыл бұрын

    I know this is an old comment, but I'm replying for the sake of others who are also wondering. So, to answer your question: no. The upper cells (r6c1 and r5c8) could both be 3, because they are not in the same row/column/block. In this situation, If the upper cells would have been on the same row we would have an x wing and then you can elimante all 3s on the same row (if no other 3s in both columns ofc).

  • @stelley08
    @stelley086 жыл бұрын

    Thanks Woody Harrelson 👍😉

  • @Shuey187

    @Shuey187

    6 жыл бұрын

    lol, huh?

  • @stelley08

    @stelley08

    6 жыл бұрын

    Shuey187 you sound like Woody Harrelson lol ...oh and thanks for the video 👍

  • @gordonpickett4103
    @gordonpickett41034 жыл бұрын

    Can anyone identify the program being used here as I want similar to help identify patterns By using colourfill Thanks

  • @Shuey187

    @Shuey187

    4 жыл бұрын

    I would recommend "Hodoku"

  • @tomstrickland6002
    @tomstrickland60024 жыл бұрын

    I realize that this is several years old. But where can I et the software that you are using in your tutorial? I'd like to be able to solve sudoku puzzles on my computer instead of on paper. Thanks

  • @Shuey187

    @Shuey187

    4 жыл бұрын

    I would recommend getting "Hodoku". The software I used in the video is referenced in the description, but Hodoku is what I've been using since then and it's way better :)

  • @bernnie314
    @bernnie3142 жыл бұрын

    Where can you find a Sudoku where you can color the cells?

  • @MyPlaylists22
    @MyPlaylists228 жыл бұрын

    Good video, thanks for sharing!

  • @mikeedge8341
    @mikeedge83418 жыл бұрын

    was this game poorly executed purely for the reason of demonstration? i feel that it is but good info in the demonstration.

  • @brianlthatcher
    @brianlthatcher7 жыл бұрын

    What is the program that you use. Where can I go to get it.

  • @Shuey187

    @Shuey187

    7 жыл бұрын

    It's listed in the description of the video, but I actually no longer use that program. I have been using "Hodoku" for the last couple years: hodoku.sourceforge.net :)

  • @brianlthatcher

    @brianlthatcher

    7 жыл бұрын

    Thank you

  • @WOS1962
    @WOS19624 жыл бұрын

    Can we eliminate #3 in R5C7 as we do in same row??

  • @Shuey187

    @Shuey187

    4 жыл бұрын

    It may be possible in a later step, but at this point in the puzzle (using the skyscraper to determine more candidates to rule out), the 3 in r5c7 cannot be eliminated because it can't be seen by BOTH rooftop cells.

  • @drrobotsir
    @drrobotsir2 жыл бұрын

    I'm trying simple sudoku software, is there a manual? Couldn't find a way to input candidates...

  • @Shuey187

    @Shuey187

    2 жыл бұрын

    I would recommend trying Hodoku.

  • @drrobotsir

    @drrobotsir

    2 жыл бұрын

    @@Shuey187 Thanks, I'll check it out

  • @koffiegast
    @koffiegast7 жыл бұрын

    I dont get this one, why cant 52 or 53 have a 3? Why must it be in 61 or 81 on the left side?

  • @Shuey187

    @Shuey187

    7 жыл бұрын

    Re-read the details in the description and see if that helps. The gist is that, because a 3 can only in exist in two places in column 1 (r6c1 & r8c1) and column 8 (r5c8 & r8c8), the "roof tops" of that skyscraper formation dictate what can be eliminated (a 3 as a possibility in r5c2, r5c3 & r6c9) because they are both able to "see" those cells. Again, because a 3 MUST exist EITHER in r5c8 or in r6c1, a possibility of a 3 can be ruled out from any cells that they can both see.

  • @standinonthecorner7627
    @standinonthecorner76276 жыл бұрын

    Would you say it's less complicated than the Swordfish?

  • @Shuey187

    @Shuey187

    6 жыл бұрын

    I would ;)

  • @chriskonu
    @chriskonu2 жыл бұрын

    Doesn't work for a "tighter" distance (don't know how to put it). It has to be connected to the outer columns.

  • @chuckecheese9411
    @chuckecheese94118 жыл бұрын

    omg that blew my mind

  • @vasilejosu3431
    @vasilejosu3431 Жыл бұрын

    hello, what pc app are you using here?

  • @Shuey187

    @Shuey187

    Жыл бұрын

    I don't recall the exact name, but I stopped using it long ago and have been using Hodoku ever since. It's free and really poweful.

  • @svetozarkenshtain
    @svetozarkenshtain10 жыл бұрын

    What was that software he used ?

  • @Shuey187

    @Shuey187

    10 жыл бұрын

    It's listed in the description of the video ("Simple Sudoku")

  • @kat_t
    @kat_t5 жыл бұрын

    What I don't understand is what prevents the 3 from being in both staggered boxes?

  • @Shuey187

    @Shuey187

    5 жыл бұрын

    I'm not sure I understand the details of what you're struggling with. If you can explain it more, I'll certainly try to help. Be sure to read the full description again, and then watch the video again - hopefully that'll help :-/

  • @kat_t

    @kat_t

    5 жыл бұрын

    ​@@Shuey187 I got it, thanks! I was actually looking at a different type of scenario not presented in this video.

  • @andrewpark2361
    @andrewpark23616 жыл бұрын

    You should explain what it means when you say "... any square that a cell can SEE." I had to rewind and replay parts of the video just to try and grasp what you meant by that terminology. I was literally scratching my head wondering which cells you were referring to in your examples in terms of which squares a cell can "see." Does this refer to an cell in the same row and column? In the same square? I mean technically every cell can "see" all other squares, assuming they had eyes....

  • @Shuey187

    @Shuey187

    6 жыл бұрын

    Sorry about that. I do give some details about this topic in the video description, but I guess I could've elaborated more by saying something like "Any cells that are visible by BOTH roof tops can be eliminated" (where "visible by both" means any cells that are either visible by row or house). When I say "visible", I mean it in the same sense that cells get eliminated with basic techniques (like when you pick a single cell and you cross reference every other cell that helps rule out candidates). I hope this helps a little more :).

  • @hypnovia
    @hypnovia7 жыл бұрын

    What program is this?

  • @Shuey187

    @Shuey187

    7 жыл бұрын

    I use Hodoku

  • @CynthiaLK
    @CynthiaLK4 жыл бұрын

    This is explained very well for me, up to a point. I don't quite know what it means to "see" a cell in a Sudoku. I don't understand the process that let the two cells next to each other on the left side of the puzzle be eliminated from the threes. it looks to me like one cell could see the first of the other cells, and the other cell could see the second of the other cells . I couldn't see how both cells could see both of them. Help help!! :) :) :) Can somebody please explain what it means to "see" a cell?? Thanks.

  • @Shuey187

    @Shuey187

    4 жыл бұрын

    It's funny when I watch my own videos from years ago and I realize how new I was to explaining this, lol. Thank you for the support and patience while you learn the things I'm teaching. Let me elaborate some more on the technique. Let me first reference some sudoku terminology fundamentals: 1. Each single square in the puzzle where a single number can exist is called a "cell" (there's a total of 81 cells in a sudoku board). 2. Notice that there are 9 "boxes" that each contain 9 "cells" (3x3 squares) - these are called "houses". So if we numbered the "houses", the top row of houses would be "1", "2", "3", the middle row of houses would be "4", "5", "6", and the bottom row of houses would be "7", "8", "9". 3. And there are 9 "rows" and 9 "columns". Every cell exists in a row AND a column. For example, the green highlighted cell at the top left of the skyscraper is in row 6 AND column 1, so it would be labeled "r6c1". And when you want to reference cells that exist in the same row but multiple columns, you can combine the numbers like this --> Example: cell r3c4 and cell r3c6 could be combined as "r3c46". Looking at the "staggered box shape" that I've highlighted in the video, the two cells in the bottom row could be referred to as the "base" of the "skyscraper". And the two staggered cells at the top could be referred to as the "rooftop" (which looks like it slopes downward from the top right to the top left). Let's call the cell at the top left "RT1" (r6c1) and the cell at the top right "RT2" (r5c8). RT1 can "see" all the cells that it shares a house with (house #4), and it can also see all the cells that it shares a row with (row 6). RT2 can "see" all the cells that it shares a house with (house #6), and it can also see all the cells that it shares a row with (row 5). When we look at which cells both RT1 and RT2 can see, the cells would be: r5c23 and r6c9 Because RT1 and RT2 can both see those three cells, they can be eliminated as possible candidates since a 3 HAS to exist in either RT1 or RT2. I hope that helps :)

  • @CynthiaLK

    @CynthiaLK

    4 жыл бұрын

    @@Shuey187 Thank you so much!! That helps a LOT!!

  • @CynthiaLK

    @CynthiaLK

    4 жыл бұрын

    @@Shuey187 I found a skyscraper leaning on its side in a sudoku I was stuck on. I'll see how well I really understood it in a little while. :)

  • @CynthiaLK

    @CynthiaLK

    4 жыл бұрын

    @@Shuey187 WooHoo!!! I guess I understand your explanation, because my sideways skyscraper got me out of my roadblock, and I finished the puzzle. Thanks bunches!!!

  • @Shuey187

    @Shuey187

    4 жыл бұрын

    @@CynthiaLK So happy I was able to help! Happy Sudokuing! :)

  • @jessesilva9867
    @jessesilva98679 жыл бұрын

    Whats the name of the sudoku program?

  • @Shuey187

    @Shuey187

    9 жыл бұрын

    The one I used in the video is called "Simple Sudoku", but I have since been using Hodoku; it's WAY better!

  • @jessesilva9867

    @jessesilva9867

    9 жыл бұрын

    Shuey187 Thanks!!

  • @benoit.gerin-lajoie
    @benoit.gerin-lajoie4 жыл бұрын

    Can you tell me how to add single hints in a cell in a one by one basis without displaying ALL the hints in all cells in Simple Sudoku please ?

  • @Shuey187

    @Shuey187

    4 жыл бұрын

    Sorry, I don't use Simple Sudoku :( - haven't for years (I use Hodoku)

  • @benoit.gerin-lajoie

    @benoit.gerin-lajoie

    4 жыл бұрын

    @@Shuey187 Hi, this video surely looks like you used Simple Sodoku and your description gives a link to Simple Sodoku at the bottom ! You are confusing... Did you use Hodoku for this video ? If yes then... it surely looks like Simple Sodoku.

  • @Shuey187

    @Shuey187

    4 жыл бұрын

    @@benoit.gerin-lajoie Yep, you're right - I WAS using Simple Sudoku in the video. But what I was saying is that that was basically a long time ago and I don't know :(. I haven't used Simple Sudoku since a few months after that video was uploaded :-/

  • @benoit.gerin-lajoie

    @benoit.gerin-lajoie

    4 жыл бұрын

    @@Shuey187 Gotcha ! Thanks. Just found Hodoku and downloaded it. Hope it'll be user friendly...

  • @Shuey187

    @Shuey187

    4 жыл бұрын

    @@benoit.gerin-lajoie Hopefully you'll like it, it's pretty amazing! :)

  • @jimvorndran9438
    @jimvorndran9438 Жыл бұрын

    Awesome, you finally explained in a way I can understand.

  • @Shuey187

    @Shuey187

    Жыл бұрын

    So glad to hear, thank you! :)

  • @pooka217
    @pooka2174 жыл бұрын

    I'm confused. You firstly said the 3's could only exist in an x configuration but then went on to state the two 3's were both at the top.

  • @lennartvanoudekerken8024

    @lennartvanoudekerken8024

    4 жыл бұрын

    No that's not what he meant. There are 2 possibilities. Either the highlighted cell in the top left is a 3, or the one in the top right. Therefore, no matter which one of those is the 3, there can't be a 3 in cells that are seen by both of the upper highlighted cells.

  • @Shuey187

    @Shuey187

    4 жыл бұрын

    The 3s in r8c1 and r8c8 for the "base" of the skyscraper, and the staggered cells at the "top" are the ones that you leverage to rule out other possibilities of 3s that the top two cells can "see".

  • @toneloc7910

    @toneloc7910

    4 жыл бұрын

    I have always thought of a skyscraper as an "offset x-wing". If this particular example were a regular x-wing, then there would be eliminations of possibilities across BOTH the top and bottom. I have also always been a little confused about how much eliminating can be done, but have finally figured it out. But in a skyscraper, there is no eliminating done across the rectangular end. Across the base, one of those cells MIGHT have that digit. Or, that digit might not be found in either of the cells of the base. That means that one (or both) of the cells at the lopsided end have that digit, and the eliminating can be done only from the lopsided end of the skyscraper.

  • @NubbyGamerYT
    @NubbyGamerYT2 жыл бұрын

    2021??

  • @Shuey187

    @Shuey187

    2 жыл бұрын

    Yes! :) I actually have several Sudoku videos that I want to upload soon, so please subscribe and keep and eye out for more :thumbsup:

  • @NubbyGamerYT

    @NubbyGamerYT

    2 жыл бұрын

    @@Shuey187 Nice

  • @kamilt1932
    @kamilt19327 жыл бұрын

    this is simple colouring

  • @Shuey187

    @Shuey187

    7 жыл бұрын

    I can see why you would think that, but technically speaking, simple coloring and skyscrapers are not the same. Here's a link with more info: hodoku.sourceforge.net/en/techniques.php. Compare "Single Digit Patterns" vs "Coloring" and you'll see what I mean. In the end though, it really doesn't matter what we call these "techniques". As long as everyone viewing them understands how they work and how to spot them, they are useful ;).

  • @Xoule
    @Xoule10 жыл бұрын

    If you like sudoku puzzles there's a game called Thermal on Google App Store that combines it with the traditional sliding puzzle. So if you need something more challenging, you can try it here: tinyurl.com/mtpyqfc (you may even find the sliding puzzle and it's other game modes interesting too! free version without sudoku is here: tinyurl.com/pm9onyq) maybe you could do a tutorial for the puzzle too?

  • @charlesyeo4675
    @charlesyeo46754 жыл бұрын

    U totally ignore a sets of 3&4 on the column left of the ones u chosen.. So in fact it inconclusive as to which sets to chose

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