Lesson 21.Sudoku. The Xwing plus scenarios.

#sudokuguy #sudoku #learnsudoku
www.sudokuguy.com
NOTE I did not do this lesson very well. I suggest strongly that if you go to tutorial #62 and #63 you will find the X wing much easier to spot and understand.
Another place to look is tutorial # 62 being uploaded in May 2020 Many of my players have mentioned that they are having problems with the X wing. Tutorial #62 gives a much more detailed look at the X wing....how to find it and what to do when you have found it.
For FAQ go to www.sudokuguy.com
The Xwing is used when you have a difficult puzzle and you have had to put all the possible small numbers in empty cells. This takes time. the challenge is to spot an Xwing. I must apologise in that at the beginning example I put in numbers in column one (36 and 169) which should have not been there..Please ignore them. Hang in there.
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[@mabdala9156]

I never had a clue how to do Sudoku, looked very confusing. so I sat down and watched about 5 hours of your lessons. I am really enjoying doing these now. thank you for your clear directions and getting me hooked on these now. regards

[@SudokuGuy]

+mabdala Thanks, Mabdala. Have fun and please tell others.

[@faridfares8338]

Hello cool guy. I am prêtty good at sudoku classic. I participated twice in french national championship. I tried to learn sudoku techniques to my friends but was not a good teacher. I sent them on your channel and they improved a lot. Thanks and keep good job. Sorry for my bad english

[@SudokuGuy]

Hi Farid Thank you Farid for telling your friends

[@WOS1962]

Huge thanks for Mr. Robin because my English had improved since I followed this amazing channel.

[@SudokuGuy]

Hi AbuOmar, Did you know that you can have my english transated to the language of your choice. kzbin.info/www/bejne/pZS8fZ-sp6-kgc0 So glad you found my site."the most popular site on line to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. Have fun as you learn step by step how to solve. kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w

[@leonarddickerson583]

With that new lesson, the concept is now firmly grasped. Thanks for reiterating with such nice examples and relaxed tutoring!

[@SudokuGuy]

You're very welcome! I suggest you look at tutorial #62 and $63 to locate these go below. So glad you found my site."the most popular site online to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. (It’s FREE) Have fun as you learn step by step how to solve. Below is my home page with all the videos listed. kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w kzbin.info www.sudokuguy.com

[@leonarddickerson583]

@@SudokuGuy Thanks for personally replying to my comments and questions--particularly since you have so many more other respondents. It is like having a personal instructor! Thanks, Robin.

[@leonarddickerson583]

Thanks for your clear explanation of using the X-wing pattern! This little technique will help me knock out big blocks of unknowns.

[@SudokuGuy]

Wonderful! So glad you found my site."the most popular site on line to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. (It’s FREE) Have fun as you learn step by step how to solve. Below is my home page with all the videos listed. kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w kzbin.info www.sudokuguy.com

[@iam2fast4ugr]

Tons of thanks, Mr. Robin!

[@SudokuGuy]

Thanx porko_rosso!!

[@juliefrecker3811]

Thanks! Watching 63 now. Love the sudoku guy mugs.

[@SudokuGuy]

Awesome! Thank you Julie. Have you purchased one? So glad you found my site."the most popular site on line to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. (It’s FREE) Have fun as you learn step by step how to solve. Below is my home page with all the videos listed. kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w

[@dennisdonovan4837]

Thanks Robyn… Always appreciate your lessons … it’s taking time and a lot of patience (sort of 🙈) but I’m getting more consistent at solving. 👍🏽

[@SudokuGuy]

Hi Dennis. there's nothing like practice. Hang in there.the more you look for patterns the easier it becomes.

[@nicholaskouyoumdjian9392]

Just solved a complicated puzzle using info from this lesson. Thanks you've been a big help.

[@SudokuGuy]

Fantastic Nicholas. Please tell others, subscribe. It is free

[@runcaz7802]

Excellent lessons. Little by little these tricks are sinking in.

[@SudokuGuy]

That's great. Hang in there. It's a lot of fun.

[@donnyh3497]

This was an extremely good lesson. Great job and thank you!

[@SudokuGuy]

Glad you liked it! Please tell others about my site.There are more videos on the Xwing. Tutorials 62 and 63 explain the Xwing better.. For a list of videos go here: kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w sudokuguy.com

[@rajan1147653]

fantastic sir,, simply superb,,, your efforts are to be saluted..... thanks a ton!!!!!!

[@SudokuGuy]

Thanks Rajan So glad you found my site."the most popular site on line to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. Have fun as you learn step by step how to solve. kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w

[@joseramalho3297]

I´ve been struggling with a puzzle for about a month. So i decided to seek help some few days ago and i bumped into your channel. Lucky me! Just watched this lesson, revisited that piece of hell, and managed to break it. Thanks a lot! I´m gonna open a bottle of champagne :-) (No i don´t, just to get an idea of my happiness)

[@SudokuGuy]

Love your comment Jose. If you have the time look at my tutorials from 20 onwards for more tricks. So glad you found my site."the most popular site on line to learn sudoku" Please tell others and subscribe and click the bell by the subscribe button. Have fun as you learn step by step how to solve. You can view all of my videos here: kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w

[@mainadasaka]

Mr Sudoku Guy. Thank you. I have enjoyed your sudoku lessons very well. You are an excellent teacher. 🥁🎺🥇🏆

[@SudokuGuy]

Thanks! 😃mai. there is much more to learn in the tutorials. See the link below. So glad you found my site."the most popular site on line to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. (It’s FREE) Have fun as you learn step by step how to solve. Below is my home page with all the videos listed. kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w

[@charlesmangum3108]

Your first example of the X-wing is very confusing; however, your second example of the X-wing cleared it up for me.

[@SudokuGuy]

Good

[@karthikeyan-qw9fp]

Thank u sir. I love ur videos.

[@SudokuGuy]

You made my day

[@Dumballa]

Great stuff, thank you.

[@SudokuGuy]

+Dumballa Thanx

[@user-ih2dp4kd9u]

Ohhhhhhhhhhhhh, thank you that finally made the light bulb go on in my head. Now, I can see the x wing. Thank you for dumming it down for me. Perfect explanation.

[@SudokuGuy]

Thank you so much for letting me know that you have understood. Please tell others about my site. Have a great weekend. For a more detailed explanation of the Xwing go to tutorial #62 and ,63

[@NatiDeNut]

Very well explained, thanks!

[@SudokuGuy]

thanks

[@shininglight2010]

thank you for another brilliant tutorial

[@SudokuGuy]

Hi Shininglight. So glad you found my site."the most popular site on line to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. Have fun as you learn step by step how to solve. kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w

[@DanielaSnijder]

Thank you so much, it worked!!!

[@SudokuGuy]

Great

[@nancywebb1845]

This is the first video on xwings that made sense to me.

[@SudokuGuy]

Hi Nancy that is wonderful news. You will find even better tutorials on the x wing (tutorial #62 and 63)Many players have told me that i make it easier to understand. It's the teacher in me I think. Thanks for your support.

[@saurabhjingade593]

Hi, really love your videos. Been through all the tutorial of yours. Thanks you. Also, @13:17, the 7 can't go there because there is a 7 at the top (1st Block). I understand that you might have shown this as an example, but I face similar sort of problems when am solving puzzles.

[@SudokuGuy]

Thanks for the info! this was not a real puzzle but a demonstration. I suggest you look at tutorial 62 and 63 . You will find a better demonstration in a reall puzzle. To find these tutorials go to the link below. So glad you found my site."the most popular site on line to learn sudoku" Please tell others, subscribe and click the bell by the subscribe button. It is FREE. Have fun as you learn step by step how to solve. You can view all of my videos here: kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w kzbin.info

[@crinaciobanu7735]

Love this one!

[@SudokuGuy]

Great Crina, Watch the next few tutorials. I plan to do more on the Xwing. Spotting takes practice.

[@suchef8518]

This is so cool! Thanks for the video!!

[@SudokuGuy]

You are so welcome! I suggest you also look at tutorial #62,63. This is a better explanation.. You will find these by going to the link below. Glad it was helpful Karma. So glad you found my site."the most popular site online to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. (It’s FREE) Have fun as you learn step by step how to solve. Below is my home page with all the videos listed. kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w

[@schatten6311]

Hi, thanks for the lesson 21 und also 20! Ich often want to make difficult sudokus, but mostly in the end there are to much small numbers and I can't eliminate them. Now I know the way to eliminate them! :) Greetings from Steffen from Germany

[@SudokuGuy]

Fantastic schatten, If you ook at my tutorials from #20 and up you will see how many little numbers can be eliminated. So glad you found my site."the most popular site on line to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. Have fun as you learn step by step how to solve. The link below will take you to all of my videos from easy to difficult. kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w

[@sharonjuniorchess]

Set out your puzzle at 7:48 and got engrossed in solving it myself from the starting numbers. I was surprised that the approach I have evolved after watching your early videos seems to be working although I have still yet to spot an X-wing. I have noticed that one can get cycles of numbers which can then be utilised to solve the puzzle along with the "only certain numbers can go in this square" check.

[@SudokuGuy]

Nice job! Please look at tutorial # 62 and 63. these will help you a lot to understand X wings. To find these go to my channel page to find tutorials. See below So glad you found my site."the most popular site on line to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. By doing so you will be notified by youtube when I upload a new video. (It’s FREE) Have fun as you learn step by step how to solve. Below is my home page with all the videos listed. kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w kzbin.info www.sudokuguy.com

[@karenchester3978]

The x wing is awesome. I sat Ned the video three times until I really understood it. Finished one puzzle using it where I only had half the numbers filled in. Then I did another puzzle marked hard, as I put in all the fours ( and there were a lot of them), I realized I didn't have to fill in everything to go BA k to the fours. So I used the x wing, a d it worked!!!!! I then finished a "hard" puzzle like it was an "easy" one. What an awesome technique!!!! Thanks!!!

[@SudokuGuy]

Hi Karen, spotting the x wing take practice. I suggest you look at tutorial #43 and 44 asi feel i did a better job at explaining the X wing. (2 types)

[@karenchester3978]

Thank you , Robin, I will check them out. :)

[@joeklamut6267]

Love your videos! You’ve got me hooked! Can you recommend a Sudoku website/app that you feel is the best to download? Thanks and you’re the best!

[@SudokuGuy]

Hi Joe Here are a couple of suggestions. App called "enjoy sudoku" Jason Reinhardt from the app store. and puzzles from tripledot studios (free) These give you pleanty of puzzles to work on. So glad you found my site."the most popular site on line to learn sudoku" Please tell others and subscribe and click the bell by the subscribe button. Have fun as you learn step by step how to solve. kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w

[@joeklamut6267]

@@SudokuGuy I just downloaded the Triple Dot one. Thanks for your advice and keep the lessons coming. I totally enjoy them and am learning lots! 👍

[@SudokuGuy]

Fantastic. Have fun as you go step by step. it feels good when you solve a puzzle.

[@Yotanido]

Got stuck on a puzzle with most of the squares still blank. Eventually, I put in all the small numbers because I didn't know what else to do - didn't help. So I looked for an xwing. After a long search I found one and managed to get rid of two small numbers. That was enough - the ramifications of that actually solved the entire puzzle. (Well, I did have all the small numbers)

[@SudokuGuy]

Well done

[@deepikaratna3278]

Thanks a lot teacher..you are the best 😊

[@SudokuGuy]

Gee Thanks Deepika. So glad you found my site."the most popular site on line to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. Have fun as you learn step by step how to solve. kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w

[@Loza422]

I’ve watched lessons 1-21 and after learning the things from them all I managed to complete my first really difficult puzzle today that I’ve been stuck on for a while. Thanks! One question.. does the xwing rule apply if the numbers are in the rows/columns right next to each other? Hope that makes sense.

[@SudokuGuy]

As long as the corners of the X wing are in 4 blocks.

[@fatihoguz2675]

thx very useful videos a question in 15,22 you wrote 2 is this result of something or comes from puzzle itself briefly asking ,can we find 2 using logic from original puzle or original puzzle itself already contains 2 ? i have missed this part but everyting ok i know this technique thx your interest

[@fatihoguz2675]

+fatih oğuz i think it comes from puzzle itself

[@SudokuGuy]

+fatih oğuz Hi faith, I can see why you were confused. The 4X4 scenario did not associate at all with the 2 in block 5. The 2 in block 5 only refers to the senario in block 5 and 8. explained. Hope this helps.

[@fatihoguz2675]

+Sudoku Guy thx i thought so... i watch your videos carefuly...

[@waynemv]

I didn't find this to be an issue prior to lesson 20. But lessons 20 and 21, there are times where due the how you are standing, and the particular camera angle, it is difficult for the viewer to see a the relevant information shown on the board. (I haven't watched any later lessons yet.)

[@SudokuGuy]

Yes your right. sorry I corrected this problem in tutorials. Please see my comment below thankx for your support http;//www.sudokuguy.com

[@WINSTONR3]

TY this is what I needed to beat an expert !

[@SudokuGuy]

Thanx

[@juliefrecker3811]

I love this video!

[@SudokuGuy]

Hi Julie. May I suggest you also look at tutorial #62 and 63. These give a better uderstanding of how to look for an X wing. You will find them here.. kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w

[@cedricsalaun1388]

Hi, I dont get why it´s can't be the 6 in the first column?

[@SudokuGuy]

You are right...you could do that

[@MoofManiac]

Thanks; I had the same question

[@joanwilson8372]

@@SudokuGuy can you explain, this appears to have two x wings, does that equate that all four of the sixes in the first two columns can be removed?

[@she_be_rosie2419]

It’s really not a full example, at least one of the three columns (1,2,8) would have to allow a six in another row. It would depend on the rest of the puzzle

[@amarqueze]

@@SudokuGuy Does make sense this answer. If we pick first column then we would eliminate the 6s on second column. If we pick second column we eliminate the 6s on first column. Where is the logic behind this decision? Looks like a random choice.

[@steveknight4291]

Thanks Sudoku guy

[@SudokuGuy]

Hang in there Steve.

[@drchetankhobragade]

Thank you sir...

[@SudokuGuy]

Thankyou to you

[@hikmatmarashdeh2293]

Thanks a lot sir for your amazing method of explanation. I have a question, how could I differentiate between eliminating candidates from rows or columns?

[@SudokuGuy]

Good question . You will need to look at the beginning lessons in order. A very important technique is the matching pair.

[@hikmatmarashdeh2293]

I will do that definitely. Thanks again for your quick response.

[@caro4art]

Thank you again for another fabulous tutorial. I can't believe that I'm up to the difficult section. Can you recommend a good sudoku book to get? I need to have the book instead of using the apps on the computer. I need to write in the columns. Many thanks again

[@SudokuGuy]

Cara Letho Hi Cara, I agree you need a book if you wish to add small numbers which is very helpful when you reach the advanced levels. I generally do not recomment books, however I have found that the Will Shortz books have one puzzle per page which makes it easier to put the small numbers in. Another alternative (which is more work) is to photocopy large empty templates of a sudoku puzzle and copy a puzzle onto an empty template.

[@caro4art]

Cara Letho Oh fantastic!!!!!.... photocopying is a great idea and you can do a batch at a time- I think this is the best option by far. Thank you again for a fabulous site

[@SudokuGuy]

Cara Letho Thankx!!!

[@lijacky3691]

very useful,that is amazing,ths a lot.

[@SudokuGuy]

Always something to learn eh!! Hang in there. Have fun.

[@lijacky3691]

@@SudokuGuy you teach me a lot,i can use it.i come form china,thank you.

[@ahmadkatip3846]

Thank you 😊

[@SudokuGuy]

Hi Ahmad So glad you found my site."the most popular site on line to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. Have fun as you learn step by step how to solve. kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w

[@MegaPotters1]

Following all in order and very helpful, I just have one little comment and that is you often block out the left side of the board so we can't see all that is going in x

[@SudokuGuy]

You are right. I have corrected that for all recent tutorials.

[@marciojanete]

É possível colocar legendas em português para explicar as técnicas xy wing e swordwish? Obrigado pela atenção

[@SudokuGuy]

sorry i don't know what you mean by the word 'legends" So glad you found my site."the most popular site on line to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. Have fun as you learn step by step how to solve. You can find all of my videos by clicking on the link below.. kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w

[@lisagordon6355]

GENIUS xo

[@SudokuGuy]

So glad you found my site."the most popular site on line to learn sudoku" Please tell others and subscribe and click the bell by the subscribe button. Have fun as you learn step by step how to solve. kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w

[@rajuanp9892]

Thankyou Professor

[@SudokuGuy]

Any time Tutorial # 62 is coming soon and it is better than this video.

[@marciojanete]

É possível colocar legendas para explicar as técnicas em português? As legendas nos vídeos do you tube são geradas em inglês automaticamente.

[@SudokuGuy]

So glad you found my site."the most popular site on line to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. Have fun as you learn step by step how to solve. You can find all of my videos by clicking on the link below.. kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w

[@Beesurvivor]

Thanks God ! This Lesson really helps !! N* 21

[@SudokuGuy]

Glad it was helpful! I suggest you look at tutorial # 62 and 63 as I give amore detailed look at the X wing. They are not uploaded yet. So glad you found my site."the most popular site on line to learn sudoku" Please tell others, subscribe and click the bell by the subscribe button. Have fun as you learn step by step how to solve. You can view all of my videos here: kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w

[@vasantigogri8125]

Thank u sir😊

[@SudokuGuy]

Keep watching A better and more detailed explanation for the X wing is found in tutorial #62, #63 So glad you found my site."the most popular site online to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. Have fun as you learn step by step how to solve. For a list of videos go here: kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w sudokuguy.com

[@dou.k]

thank you again

[@SudokuGuy]

Always welcome

[@calwingate4591]

Hi Robin, thanks so much! One thing I’m wondering ( probably best seen at 3:01 in)...why didn’t you choose ( for the left side ) the boxes with 36 and 169.... how did you know to pick the boxes of 68 and 69 for the left side please?

[@SudokuGuy]

good Point I should have only done one set. I did a poor job on this lesson. Look at the tutorials I have done which explain x wings much better.It was early in my sudoku career. Tutoiral #62 and 63 are worth looking at.

[@calwingate4591]

I will look at the 60’s - thank you so very much! And these weren’t bad, we are all learning!! Thank you!!!

[@geroldbiharie7815]

Could you please explain the w-wing also?

[@SudokuGuy]

Sure. these are hard to spot and do not happen very often.

[@Karanodom]

what does it mean on a chain of pairs when the program says cells that can see both 7 and 8.... what does see mean in this context? p 8

[@SudokuGuy]

I think it means if 2 cells can only have a 7 or 8 in each then they become a matching pair. Look at several of my early lessons where I explain matching pairs and the power they have in helping you solve.

[@salliemorrill2671]

Impressive instruments. Eraser barely cuts it. Great review.

[@SudokuGuy]

Thanks for watching! I suggest you look at tutorial 62,63 as these give a better explanation of the X wing. So glad you found my site."the most popular site online to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. Have fun as you learn step by step how to solve. For a list of videos go here: kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w sudokuguy.com

[@iski-sr8db]

Very nice Video! I found that in 13:22 the 7 cant be there, because there is an 7 up there

[@SudokuGuy]

Thanks for the info! If you look at tutorial 62 and 63 you will see a much better presentation of the 2 types of X wings. and how to spot them and what to do with them re solving. So glad you found my site."the most popular site online to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. Have fun as you learn step by step how to solve.You will find all my videos here kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w kzbin.info sudokuguy.com

[@sandhyatiwari9436]

Hello Robin. I have been working on a puzzle for a day now and it's not working out. Is there anyway I can share that puzzle with you and take your guidance ?

[@SudokuGuy]

Sure I'll do my best to help. www.sudokuguy.com

[@ankurstudy3501]

Good one love u grandpa

[@SudokuGuy]

Hi Ankur. I am glad you found my site. I am at present working on a new tutorial showing how to spot in detail an Xwing, as I felt my lesson 21 was not as good as it could have been. It will be tutorial #62

[@nosinfoodie9766]

Robin, is it true that if I did all small numbers by comp its not worthy to look for X wings?

[@SudokuGuy]

Hello No Sin. if you put some small numbers you may find an X wing, however they are easier to find if you put all possible numbers in empty cells. go to tutorials #62 and 63 for a better description. So glad you found my site. “the most popular site online to learn sudoku” Please share with others, subscribe (FREE) and click the bell by the subscribe button. Have fun as you learn step by step to solve. You will find all of my videos below. sudokuguy.com kzbin.info

[@katemiller2359]

36-469 and 169-26 makes a rectangle too. I mean, if we look for a rectangle of '6's there are two of them, not one. So, is it possible that you established a wrong scenerio?

[@SudokuGuy]

Hi Guzin You are right. Thanks for pointing it out. The other scenario is OK.

[@DeepikaSharma-pp2oy]

can we use two times x-wing method in one sudoku

[@SudokuGuy]

Yes it is possibe.

[@Karanodom]

thanks

[@SudokuGuy]

My pleaseure Karen

[@xiaochen9027]

Can it be column 1 and column 8 make X wing? Thanks

[@SudokuGuy]

Thanks for your comment. I strongly suggest you go to Tutorial 62, 63. This is where I do a much better demonstration and explanation of the X wing. So glad you found my site."the most popular site online to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. Have fun as you learn step by step how to solve. For a list of videos go here: kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w sudokuguy.com robin

[@adeliofraga3652]

What is the logic behind the x wing? Yea I can use it but what makes it work?

[@SudokuGuy]

Good question. I suggest you look at tutorial # 62 and 63

[@DJBRUCEK1]

where can I find these computer answer/solvers ??

[@SudokuGuy]

There are many computer apps but many of them do not offer these. The best way to find answers is to buy a book which has the answers at the back. The problem with answers is that it is easy to cheat. I use answers occasionally if I think there is an xwing to check if my logical answer is correct. Be carefull not to look at other numbers while looking at the answers.

[@DarkfuryGaming]

There's an Sudoku app on Android (if you got one) or already found it let me know. I using one that does that.

[@lydiayao3089]

why exactly can/t you match the first column with the eighth column?

[@SudokuGuy]

Good point. You could. The principle is the same.

[@parsleybrain]

I do not understand why the 2 sixes in the first column are not included in the x-wing? This is really confusing. Can you please clarify? Thanks.

[@SudokuGuy]

Hi parsleybrain, You have a very valid point. Thank you for pointing this out. Yes I should not have had those extra 6's. I have been considering re doing this video for that reason. If you look at the rest of the video the answers are correctt

[@parsleybrain]

I watched the video till the end and I think I understand now. Thanks for taking the time to answer.

[@WOS1962]

Noting the absence of the number 8 in the lines in the second example

[@SudokuGuy]

Please give the min/sec place you are referring to.

[@jrwatson4350]

Why did you use the 68's in column 2 instead of the 36 and 169 in column?

[@SudokuGuy]

+JR Watson Please send me the min number so I can locate what you are referring to. Thanks.

[@jrwatson4350]

+Sudoku Guy Sorry I forgot the column number for the 36 and 169 that were to the left of the 68's in column 2. The 36 and 169 are in column 1

[@tharun8164]

Sudoku guy, Could you explain why did you prefer second column's 6 instead of first column's 6 in the xwing introduction?

[@WOS1962]

I think if you put the camera in the right angle, that's be a better to see the whole board clearly.

[@SudokuGuy]

You are right. I am doing better further on I hope.

[@amitpandya6827]

Nice

[@SudokuGuy]

Thanks

[@amitpandya6827]

@@SudokuGuy 💐👍

[@minnahumble2294]

At minute. 1:42, I do not understand why you chose the sixes in the second column when you could form the X using the sixes in columns 1 and 8 instead of 2 and 8.

[@Billhumphreys3370]

You are right. He needs to get rid of the 6 in column 1, row 8, to make this a valid xwing.

[@SudokuGuy]

You are both right Watch tutorial # 62 63 for a better explanation. So glad you found my site."the most popular site online to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. Have fun as you learn step by step how to solve.You will find all my videos here kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w kzbin.info

[@koenth2359]

8:08 In left upper block, the 1 has to go into the leftmost column, so that in the left lower block we can fill in a 1 right below the 5

[@SudokuGuy]

It's a scenaio not a full puzzle

[@jakesprake]

in the example where he picked the two sixes from the 68s, the numbers to the left of each 68 included 6s, why not pick those 6s? Was it because of the wo 68s?

[@SudokuGuy]

jakesprake Hi jakespoke, If I undestand you correctly you have answered your question when you say "was it because of the two 68's. For an Xwing pattern in this case we are looking for a rectangle of sixes. I suggest you look at the video again as this is quite complicated. Each time you look at the video you may understand more. Hang in there. You have done well to reach this level of puzzle.

[@jakesprake]

Sudoku Guy Thanks Roy, you said you're looking for one number which only goes in two places. The two sixes of the 68 are matched up with the sixes of the 469 and the 26. But to the left of the top 68 there are is a 36 and below a 169, could those be used? Thanks.

[@appylee9942]

@@SudokuGuy I am still confused like the others as to why you cannot use the 6's in column one? If you used that then you would get different results because the 6's in column 2 would be eliminated?

[@SudokuGuy]

@Appy Lee please see my comment underneath the video. I apologise

[@SudokuGuy]

Please see my comment underneath the video

[@arunprasath2388]

How to find column or row x wing

[@SudokuGuy]

I suggest you look at tutorial 62 and 63. This will show you more. So glad you found my site."the most popular site on line to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. (It’s FREE) Have fun as you learn step by step how to solve. Below is my home page with all the videos listed. kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w

[@Muggar62]

After watching your video I completed a Diabolical puzzle after finding an Xwing. Thankyou! Assuming then, if you can't find the Xwing(s) then you basically can't complete the puzzle? At www.sudoku.com there are 'expert' puzzles with initially only 18 candidates. I'm assuming they are the toughest and most difficult to complete? Haven't found tougher ones . . .

[@SudokuGuy]

Yes they are

[@Democracy-wy9pl]

Shouldn't the 9 and 7 in the handle be put in as a 9,7 matched pair . I don't see how you can decide which is the 9 and which one is the 7?

[@SudokuGuy]

Sorry i don't know which video you are referring to.

[@Democracy-wy9pl]

@@SudokuGuy This video at 13:15 . Sorry , I should have given a time as there are several examples in this video.

[@popeye2sea]

Time stamp 13:30 in the scenario where you need to place a 1,2,3,4,7,8 in column 3, where is the logic of placing the four in row 9? It could logically have also been placed in column 2 row 9. This means it could also have been placed in any other vacant cell in column three.

[@SudokuGuy]

Hi Henry, yes you are right, however this was a demonstration of a technique not a real puzzle. I should have put 1 other number in row 9 cell 2. You are the first person to note this. Well done.

[@IngoziDanger]

I think I spotted a mistake in the Bottom left block. In BLB' right column, There are 2 7s. 16:03 on the video

[@SudokuGuy]

Sorry Aanrel I think you missed the point.

[@IngoziDanger]

@@SudokuGuy I ended up seeing the point. Thank you very much Sir

[@pmaat8081]

Thirst of all, thank you for your clear explaining, it helps me a lot! But please don't stand in front of the whiteboard while explaning. We cannot see what you're doing when you stand in front of it. This habbit reminds me of my old math teachers....

[@SudokuGuy]

You are right , thanks for your comment. In All recent videos I have avoided this. So glad you found my site."the most popular site online to learn sudoku" Please share with others, give me a thumbs up below the video, and subscribe and click the bell by the subscribe button. By doing so you will be notified by youtube when I upload a new video. (It’s FREE) Have fun as you learn step by step how to solve. Below is my home page with all the videos listed. kzbin.info

[@sankalanghosh5503]

whats the logic behind that rectangle?

[@SudokuGuy]

The only thing I can suggest not knowing where you are coming from with your thoughts is to look and listen to the video again. I am working on uploading detailed tutorials about how to spot Xwings There are 2 types. I also show how to spot an X wing in a puzzle. Hang in there. Xwings are hard to spot, but a very valuable tool for solving difficult puzzles.

[@sankalanghosh5503]

@@SudokuGuy in 1:45 why we did not take the two leftmost 6s?(one in 36 and in 169)

[@asanitian6218]

How can I find videos after 25 ..

[@SudokuGuy]

Go to my channel page Here it is kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w and then look at tutorials 1 -99 Thanks for your interest. So glad you found my site."the most popular site online to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. Have fun as you learn step by step how to solve. For a list of videos go here: kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w sudokuguy.com youtube.com@sudokuguy

[@simon24h]

In yor second scenario you put a 7 in a column that already contains a seven.

[@SudokuGuy]

If I understand you correctly you failed to realize that on the board I had 2 separate scenarios and they do not relate to each other.

[@pushpadesai9797]

Where do we get erasable big sudokugrig?

[@SudokuGuy]

I had it made especially for my teaching.

[@jakesprake]

Is it because those 68s are a matching pair?

[@SudokuGuy]

+jakesprake Yes

[@jakesprake]

I understand it now thanks Robin.

[@slsute2]

Is it considered cheating to have a program put all the possibilities in for you? If you’re doing paper puzzles? I never thought to do that.

[@SudokuGuy]

Good question. Using a computer app which allows you to put in all the possible numbers is a form of cheating in that when you do it yourself the correct numbers are your responsibility. Having all the numbers at the beginning can be overwhelming. Doing the first part yourself using snyder notation gives you more satisfaction when you solve it entirely yourself, but it take longer. When you put a number in yourself you then have the opportunity say to yourself what are the ramiciations of this number.So glad you found my site."the most popular site on line to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. (It’s FREE) Have fun as you learn step by step how to solve. Below is my home page with all the videos listed. kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w

[@URDESPORTS]

Sir you picked Wrong 6’s in the very first example …. as there were two sixes at left also with the same base and height …. Please rectify me if i’m wrong 😅 And please provide me free Classes if i am right here (If you want) 😂

[@SudokuGuy]

Hurd. Please look at tutorial # 62 and 63 as I explain the X wing much better. Yes it was many years ago when I did my first lesson on X wings Have learnt much more since.

[@StrukA1991]

Puzzle on 13:20 was wrong, becouse in first block we had 7 and 9 in L column.

[@SudokuGuy]

Sorry Senad. I think you were mistaken. The top section of the board had no relationship with the bottom section. They were separate scenarios.

[@lisagordon6355]

confused! Q. why not use the 6's in column 1?

[@lisagordon6355]

is it because there were 3 no's in bottom cell?

[@lisagordon6355]

Ray B i'm going to watch again, perhaps it will sink in!

[@jonasdrone4582]

lisa gordon because if you watch closely, they’re both 68 or matching pairs meaning on column 2, 6 and 8 sureley belongs there

[@robxyz2926]

If you look at time 3:38 he pauses a bit because he realized he messed up with his example.

[@painlesslee]

No

[@tarayataraya5197]

Look between 13:10 and 13:22.... He is putting 7 in the right column when there is one already

[@SudokuGuy]

Sorry but the section at the bottom is a scenario and it has nothing to do with the upper section which is a different scenario

[@nathanbrantley6949]

It is confusing to us viewers because you "look up" to boxes 1-3 before writing the 9 and 7 in Box 7, as if it is connected (maybe it is a habit). Also, I don't recall you making it abundantly clear they are 2 different scenarios on the single sudoku. You may wish to clarify your video description. Thank you for the otherwise helpful video.

[@laurenlaserone6484]

At timestamp 2:01 I'm asking, "but how did he know to choose THOSE particular cells??!". I'm trying so hard to learn but I'm so dumb now. (Was recently diagnosed with memory and cognitive problems even though I didn't used to be this way: 8 years of college and succeeded through University level calc III with A's and B's.) You have seven columns with numbers in them, why didn't you pick those two columns? I'm really sorry for the stupid questions, I'm just trying to exercise my brain and get better.

[@SudokuGuy]

You are right,, I should have not put anything in the first column as it made it more confusing. Well done for seeing that mistake.

[@laurenlaserone6484]

Sudoku Guy oh no, I didn't see that what you did was a mistake, I really didn't mean it that way! :( I just mean that I'm really struggling with cognitive problems lately and I just sometimes wish I knew what made people take that first or second or next step while solving Sudoku. I just can't follow the logic. I'm slowly getting better at Sudoku, though. And I have you to credit for a lot of that! :-) I love your videos. I have a friend that can do any level of Sudoku puzzle and doesn't ever ever do pencil marks doesn't know anything about why people put pencil marks and doesn't know anything about all these different methods and strategies. She can just look at a puzzle and over time solve it without any particular methods or steps. I keep asking her for lessons but because she doesn't have any particular method or steps I don't think she can teach me. I think she's just naturally brilliant. I used to be smarter, but even though I'm only in my 40's I'm having cognitive and memory problems that started about a year or two ago. Thank you so much for everything that you do, your videos and your replying to comments. You're awesome! :)

[@surajpawar9382]

13.25, you placed the 7 wrong. There is already a 7 in the column at the top

[@SudokuGuy]

OK . Please look at a better explanation of the the X wing in tutorial #62 and 63

[@joukydouky313]

But this technique has an error, doesn't it? On the first example, what if the 469 cell is a 4 value and the 68 cell on the top left is an eight. That could be possible and the 6's you deleted, could be the ones needed to complete a puzzle. Which are the rules of this techinique? Can I apply it only when we have 2 candidate numbers in the cell? Or when? Because, it has no sense for me.

[@SudokuGuy]

Yes it is not a good example. I suggest you Go to tutorial # 62 and 63. I explain it much better. Go to my channel page kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w to see all the examples and explanations of the x wing much better. Robin

[@007hellz]

@13:19 you put the 7 in a column that already contains a 7.

[@SudokuGuy]

Hi Zeus. Sorry you did not understand that the top 3 blocks was one scenarion and the bottom 3 blocks was another scenario. they were not connected in any way.ie not a real puzzle but a demostration of technique.

[@007hellz]

@@SudokuGuy oh ok. Thanks for tje response. Love your videos.

[@gb903]

Jeez Nicholas Parsons has let himself go. Wonder if they make that jacket in his size?

[@SudokuGuy]

I borrowed it!

[@crisrody852]

Before this lesson, I was stuck in sudokus that have a minimum of at least 26 clues, I could only do some 24 a few times Now, thanks to the Xwing, I can do my sudokus in half of the time and I'm doing most of the 21 clues without problems

[@crisrody852]

Ps. loved your videos and how you teach things, I started to watch just to see if I could find something that I didn't found by myself, and now in this lesson, everything was worth! Also, isn't easier to start the sudoku by numbers 1,2,3... instead of LMB LCR? I always found more clean to search one number at time in all the 81 cells, at least this way I usually would not miss a ramification and save time.

[@SudokuGuy]

If it works for you great. I designed TMB and LCR for the beginner.

[@kalebyurchak7375]

can you have an x-wing in two columns next to each other?

[@SudokuGuy]

Good question. Generally an X wing occurs in four separate blocks. It can work if 2 columns are parrallel to each other, however I have found that the cleaver pattern, table pattern and exclusion rule usually comes into action earlier and the X wing is not needed. I'll research this more and get back to you if I am not correct.

[@kalebyurchak7375]

awesome, thanks!!

[@gaurabsomare3143]

I think sudoku guy is miskate at 13:24 3rd column

[@SudokuGuy]

Hi I don't think there is a mistake. Did you realize that the bottom horizontal blocks is a scneario and has nothing to do with the top 3 horizontal blocks. If this is not the case then please tell me the mistake. So glad you found my site."the most popular site on line to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. (It’s FREE) Have fun as you learn step by step how to solve. Below is my home page with all the videos listed. kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w

[@gaurabsomare3143]

@@SudokuGuy i found two 7s in the 3rd column, or may be you are just teaching the concept,, whatever, You are the best and Im from Nepal, it was great pleasure to hear Nepali greeting 'Namaste' in your video in Lesson-16(i think), so now im following your tutoring videos, a regular viewer and your follower 😊

[@Francisqolito]

Is it just me or does anyone feel like the row and columns bring an identical xwing

[@SudokuGuy]

They are both the same shape but in one shape you remove little numbers e.g. rowd and in the othery you rermove little numbers in columns. I hope I understand what you mean.

[@Francisqolito]

OK let me see if I get this right. So whenever a rectangle or a square-forming canditature of a number appearz thier results in total abolition of all the identical number appearance orthoposed in out, vertically and horizontally the said rectangle/square.

[@edladd212]

The rectangle is made by saying there are only 2 of the number in each of column. Once you've formed the xwing you could use it to remove numbers from the rest of the column, but there won't be any because that's how you chose those numbers in the first place. So yes, it's the same shape, but there will only be candidates to eliminate in one direction.

[@SudokuGuy]

You arre right.

[@kartikeygoel6802]

you are funny

[@SudokuGuy]

Oh!!! shucks....thanx