The Best X-Wing Explanation You Will Ever See! / Tutorial #10

Sudoku X-Wing Pattern Explained. A "Fish" Pattern of Size 2. One of the most commonly-occurring and easily-identifiable solving techniques.

[@Teancem]

I feel like I have found gold! This is what I have been needing. I can tell you put a lot of time and effort into your videos. Very much appreciated! :)

[@SudokuSwami]

Thank you for your comment. Good luck!

[@BioToxin]

About 19 minutes in I had that lightbulb moment of oh now I get it, took me 3 hours and dozens of guides to wrap my head around it properly without any remaining questions, thanks

[@Adulting_Autistic]

This comment of yours gives me hope. I am autistic and have been doing Sudokus for years. I end up pushing the ones that are too hard in a folder to go back to. I never even knew about this technique until recently. I hope I can learn it. I want to finish all the Sudokus, even the really hard ones.

[@jamesmason5069]

Swami, you are a top notch teacher. I have never been able to find an explanation of x wing that made sense before this. Thank you. It has increase my enjoyment of sudoku.

[@TonyJibster]

I made it through 10 lessons and I am enjoying your content. I appreciate that you focus on the logic that makes this all work. Thank you for sharing! = )

[@karabishopart4153]

Who knew it was actually really simple but every other book makes it supercomplicated! Thanks again Swami

[@danielmardim5866]

Truely the best x-wing tutorial there is

[@stephenmneedham]

The quality of your tutorials are why I finally took the step into fish land Swamiman. Your subscriber population would probably jump if you dropped the shades and wore funny ties but I like you just the way you are. Never let the lure of quantity change you.

[@SudokuSwami]

So, are you saying you want to be my Manager? :-))

[@stephenmneedham]

LOL Swamiman and a big yes on a newspaper friendly approach. I'm guessing that's what got most people interested !

[@SudokuSwami]

If you enjoyed this Video, please don't forget to click the SUBSCRIBE button, and the Thumbs Up Icon. It will really help me out. Thank you!

[@BRUCE2W]

Thank You finally a real explanation on the X wing, great job tks for making the video!

[@iannalemme]

like always, thank you for the detailed explanation. i finally understood how to pick the corners. i was not understanding it correctly.

[@nicholaskouyoumdjian9392]

Best explanation I've seen yet. Thanks

[@niyazigs1905]

What a perfect explanation is that, thank you so much!

[@kareemismael9001]

I guess im asking randomly but does anybody know of a trick to log back into an Instagram account?? I was stupid lost the login password. I appreciate any help you can give me

[@patrickcollin2949]

@Kareem Ismael instablaster ;)

[@kareemismael9001]

@Patrick Collin Thanks so much for your reply. I got to the site through google and I'm trying it out atm. Seems to take quite some time so I will get back to you later when my account password hopefully is recovered.

[@kareemismael9001]

@Patrick Collin it worked and I actually got access to my account again. I'm so happy:D Thanks so much you really help me out!

[@patrickcollin2949]

@Kareem Ismael glad I could help :D

[@oumaroudia]

Now we get to apply the general theory articulated in the AIC videos. Just great!

[@SudokuSwami]

The Complete Course will end with 13 Videos dedicated to AIC's Type I & II and AIC Loops. Video #4 was just a "taste." :-))

[@oumaroudia]

My take so far. Unless you are a genius, savant or swami, videos series 5 to 9 (arguably to the exception of hidden candidates --which are hard to find, or at least take time to find) are great for manual/and or beginners’ solving. Manual solving can be fun in its own right. I do it in my train/bus commutes. For more advanced puzzles, I start with the manual solving using the techniques in videos 5 to 9 until I get stuck. Then I input my results in a sudoku program to get the candidates (including filtering on specific ones), from there I turn to the higher levels solving methods using the general AIC and its specific applications such as X-wing etc. I can't wait to get to AIC's Type I & II and AIC Loops. A of fun ahead!

[@SudokuSwami]

AIC's Type I & II were covered in Videos #4 & #4-A. But I will cover them in more detail later on, starting with Tutorial #33.

[@troglodyte67]

Good explanation, thank you!

[@SudokuSwami]

Thank you for your comment. I really appreciate it! :-))

[@leonarddickerson583]

Thanks for this very good explanation along with nice examples!

[@Beth-ws5nt]

Hey! I finally could understand it! Thank you!

[@SudokuSwami]

For Beautiful Custom T-Shirts & Coffee Mugs featuring the Swami Logo, and also for Selected Classical Piano Pieces played by me, now available via Digital Download, please visit the Sudoku Swami Gift Shop! sudoku-swami.shopify.com

[@wordoku]

X-wings explained very well! Thank you for this video.

[@SudokuSwami]

Thanks, Harold. It's an honor to get a compliment from you. Your Videos are fantastic. Anyone reading this should check them out. :-)) sudokuprimer.com

[@wordoku]

@@SudokuSwami Thank you Mr. Swami!

[@markpatchett]

I finally get it!!!

[@priya0505]

U r really a great sudoku guide

[@chubigans60]

Finally I get it. Thank you so much!

[@francisbriggs76]

Excellent video. Helps so much!

[@peterkelley6344]

Correct me if I am wrong. What your really saying is that instance of the numbers in the X-Wing corner squares are to be eliminated in the rows AND columns as candidates. This is not a if/or case but an ALL case because the rule of Soduko says there can be only ONE of that number in any row or column. I think I understand this half of the procedure. The question that is left is what the best approach for eliminating which pair is the wrong pair from this point When no other basic information is seen? FOOTNOTE: i had thought the term X-WING came out of the Star Wars franchise for the X-Wing Fighters that could adjust their wing positions.

[@SudokuSwami]

Hello Peter. Once you identify the Base Sets, you will know that one diagonal pair of Candidates is True, and the other diagonal pair is False, even though you don't yet know which is which. Nevertheless, this allows you to eliminate all Fish Candidates from the Cover Sets that are not included in the Base Sets. That is the sole benefit of an X-Wing. Nothing further can be deduced, until you apply other solving techniques.

[@peterkelley6344]

@@SudokuSwami Thank you for reaffirming this information. Much appreciated.

[@sharonjuniorchess]

Impressive. Towards the end I often find more than two squares that can host the same number but the same number occurs more than twice in the same row or column. This will help. I have been colouring in the same number squares but was missing how to spot the X wings or their significance.

[@EitrVethr]

Video starts at 5:48

[@johngardner1898]

Very well explained.

[@nesse40]

thank you. From you I've learnt how to identify the 'x' but I stilln struggle figuring out which is the base and which is the cover set. Can you help me please? :-)

[@SudokuSwami]

The Base Sets EACH have EXACTLY and ONLY Two instances of the X-Wing Candidate. These four Cells form a square or a rectangle. The only way it can work out, is if one diagonal pair of those four Candidates is True, and the other diagonal pair is False. But either way, it allows you to eliminate all other instances of the Fish Digit from the Cover Sets.

[@froggytuff]

@@SudokuSwami I can get it now!!!!!! Thank you so much!!!

[@froggytuff]

I am ness E on my computer

[@sturmwind1180]

Many thanks. Very clear and very helpful.

[@SudokuSwami]

Be sure to visit sudokuswami.com for an Outline of the Entire Course, and news about upcoming Videos!

[@priya0505]

Thank u very much sudoku swami

[@LookSharpFeelSharpBeSharp]

Awesome!! Big thanks!!

[@wpphili]

Is it a rule that X-Wings are always in two different chute? At least, A fish with a fin in the same chute doest abide to the same logic a "2-chutes" X-Wings!

[@SudokuSwami]

The 4 Cells of the X-Wing can be in One Chute (or Two Chutes). But they cannot all be in the same Block. The X-Wing must lie in at least Two Blocks (or Four Blocks).

[@stephenmneedham]

Learning this with pencil and paper must stretch the learning curve to years. I don't think I'd even bother though computerless I would have a lot more dead time to fill...

[@SudokuSwami]

I am gearing up for a "Pencil & Paper" Course soon. Stay tuned......

[@pvuor]

Now, in all these examples, the four x-wing cells are in four different blocks. Obviously, there cannot be an x-wing within one block, but it seems to me that an x-wing might occur in just two blocks. Am I mistaken?

[@SudokuSwami]

Yes, 2 Blocks or 4 Blocks. NOT in 1 Block.

[@pvuor]

@@SudokuSwami Thanks.

[@waynefollett]

When you show me an e-wing and we complete it, I see other x-wing potentials...I assume we can do more than 1 x-wing solving the puzzle?

[@SudokuSwami]

Yes, of course. There can be several X-Wings in any particular puzzle. When I show examples in the Tutorials, they are just for demonstration purposes only. We are not trying to "solve" those puzzles from start to finish. I sometimes solve puzzles from start to finish in my Random Tips & Tricks Videos, and I will also be doing that in my upcoming Pencil & Paper Method. Good luck!

[@EitrVethr]

What if there are numbers in the base sets, do i get rid of those too

[@SudokuSwami]

Eliminations in an X-Wing, occur ONLY in the Cover Sets, in Cells that DO NOT include the 4 Cells of the X-Wing. Please watch the entire Video, before asking questions that are already answered.

[@ruthcanterbury7738]

I noticed that your base sets lie in different chutes. Is that a requirement, or can they lie in the same chute?

[@SudokuSwami]

Good question. Yes, of course they can lie in the same Chute. The only stipulation is that the four Cells of the X-Wing CANNOT all lie in the same Block. I did not realize until you asked this question, that in Videos #10 & #11, none of my examples had Base Sets in the same Chute! (I just looked.) That's just the way it turned out. It was not intentional. However, in Video #11-A, there were in fact two examples with the Base Sets in the same Chute, demonstrating that this is possible. Thank you for your comment.

[@kcronet55]

How will you determine whether a base set falls in a row or column? Can anyone clarify?

[@SudokuSwami]

You don't "determine" it. You FIND it. The Base Sets will each contain exactly 2 of the same Candidate. These 2 Candidates must lie in exactly 2 Rows and 2 Columns. If the Base Sets are in the Rows, the eliminations will be in the Columns, and vice versa.

[@khyleebrahh7]

I don’t understand strong and weak link and base numbers

[@SudokuSwami]

The best way to understand everything, is to watch all the Complete Course Tutorials in chronological order, beginning with #1. Each Lesson provides information that prepares you for the next.

[@edt.5118]

Yo! That music

[@adrianalauraregis655]

HI. X'wings always have to have the 4 candidates in differents blocks?. 2 candidates in one block and the others 2 in another block, is it possible? (let say 2 in block 1 and 2 in block4). thks

[@SudokuSwami]

If you watched the whole Video, you would already know the answer to this question. But, the answer is, "Yes." The only prohibition, is that the 4 Cells cannot all be in the SAME Block.

[@dinhnguyen-sc2mt]

x-wing, fined, sashimi xwing. Is it true in a chute?

[@SudokuSwami]

Yes, it is true. But two of the Cells of the X-Wing Pattern must be in one Block, and the other two Cells must be in another Block. Regular X-Wing will work normally. Finned X-Wing, can produce a maximum of ONE Candidate elimination. Sashimi X-Wing, is a little tricky. If there is only ONE Fin, then it is better interpreted as a Skyscraper. As a Skyscraper, all other X-Wing Candidates can be eliminated from the rest of the Block where the X-Wing Candidate and the Fin are located. If it is Sashimi, and there are TWO Fins, then again, you can have at most, ONE Candidate elimination.

[@dinhnguyen-sc2mt]

thank you

[@michaelandis1004]

Where can I download the Sudoku software you use in your videos?

[@SudokuSwami]

Hello Michael. I don't discuss software here in this Comments area. Please send me an email to [e-mail], and I'll tell you all about it. Thanks. :-))

[@averagenextdoorneighbor3143]

What a detailed and brilliant explanation! During this quarantine period, i have been using this time to make some sudoku videos and it will be great if you can check my channel out! we can even work on the undone exercises together, and the answers can all be found at the end of each respective videos. Please and thank you!

[@pipster1891]

A turbot is a fish and is pronounced "TUR-buht", not "turbo".

[@SudokuSwami]

In English, you are correct. But in France, the same word is pronounced with the second T silent. I have always pronounced it the French way.

[@jayb6193]

Wow

[@7d2h3an9d8]

He must use an arrowhead or pointer when he's deleting certain NOS. Then we can follow him carefully.

[@estycki]

OOOOOOOOOOOOOOH so simpo

[@7d2h3an9d8]

Introduction is too, too long! Get down to the technique straightaway. Unnecessary minutes are wasted.

[@7d2h3an9d8]

Too, too much valuable mins are taken up by the v. Long piano music n Sud. Sw. repeating terms n definitions over n over again. He shud've launched into XWings immediately.

[@SudokuSwami]

I find it interesting that you have now left 4 derogatory comments on this Video over a two-week period, and yet you keep watching it. You can use the Fast Forward Button, if you feel the Intro is too long.

[@7d2h3an9d8]

Too much repetition