Swordfish Caught and Eaten! / Sudoku Tutorial #12

[@thsone]

Finally, someone who explains swordfish clearly! Ty!!!!

[@SudokuSwami]

Great. Glad you enjoyed this Video and found it helpful. Good luck!

[@thsone]

@@SudokuSwami unfortunately, im still getting mixed up in trying to spot a real swordfish... it looks like 1, welp, bak to rewatching ure vid. Lol

[@Sh4dow04]

This is the most underrated Sudoku channel I've ever seen. You deserve more subscribers because your videos and your explanation are outstanding. Thanks a lot! I coudn't understood the Swordfish pattern until I found your video. :)

[@SudokuSwami]

Thanks very much. I really appreciate your comment. If I had 1M Subscribers, I would certainly resume Video production. Please spread the word, and stay safe. Good luck. SS

[@Cmppayne26542]

1000% Agreed. I am mystified how he does not have more subscribers and views than some of the other more popular Sudoku experts on KZbin.

[@iCYY]

100% agree. This is the most understanding sudoku channel on youtube.

[@SudokuSwami]

These tutorials are intended to be a series of lectures similar to what you would expect in a college course. They are not meant to be rushed through. I admit, some of them are lengthy, but I try to make every minute meaningful. It will require some effort on your part, but if you take the time to learn all the principles I am teaching, you will become a Sudoku Expert. I guarantee it. 😊

[@mygoldfishrocks]

I've watched numerous videos by sudoku "champions" or self-proclaimed "experts" who compete not even medium difficulty puzzles, and were absolutely a waste of time. Your tutorial, Sir, is the most helpful on KZbin. Thank you so much.

[@SudokuSwami]

Hello Niki. Thank you for the nice compliment. Welcome aboard. If you have any questions, feel free to email me at [e-mail] Good luck! :-))

[@caulerpa1]

Hi there. I really enjoy your explanations. They're the best I found, and I say this as an experienced teacher and lecturer.

[@SudokuSwami]

Hello, thank you for your interest. You have to realize, that when I create these diagrams featuring and focusing on only one candidate at a time, these are not real puzzles, and are only meant for demonstration purposes. I will oftentimes scatter random instances of the candidate around the grid, that are not meant to be analyzed critically. Please try to focus on the point I am trying to make, rather than try to solve the puzzle. Okay? Thanks! Good luck.

[@maradona673]

Superv. La mejor explicación de swordfish que he visto. No entendía el swordfish. Gracias

[@iCYY]

I’ve learned so much from your videos. So informative and clear. Really helpful.

[@fubaralakbar6800]

Well, you said not to focus on solving these puzzles, so of course I had to try : ) I have now been through the first three in this lesson, as well as the real world puzzle in lesson 3. I have to tell you, these are some very gratifyingly difficult puzzles to solve. Especially the one from lesson 3, which is one of the hardest I have ever done. Seriously, I completed it once a couple of months ago, but I had to have a go at it again just to see if I've still got it--and unfortunately I don't lol. I've been working on it for over a week! Your channel is awesome, and I would love to see you take it up again.

[@amandawebber3684]

I just don't understand how you single out which rows or columns to use as the base sets. Everything else makes sense, but how are you choosing the base?

[@jayr526]

I don't know if I like your playing or explanations better. They are both wonderful.

[@SudokuSwami]

Thanks very much. I really appreciate your saying so.

[@lubaaudio]

your explanations are awesome! very clear. i finally understand this! thank you so much!!

[@vharish6045]

Sir I have been watching your training programs and has learned to solve level 4 Sudoku puzzles. I am indebted to you for sharing your knowledge. I would like to share with you my learning. 1. In level4 Sudoku puzzle, usually one of the nine digit is missing. 2. By not writing the missing digit, if we continue to fill the grid with other given digits, the problem can be solved easily. 3. But triplets and conjugate pairs should not be considered unless we see a blank cell relating to triplet or conjugate pair in a row or column. 4. X wing, se shami, and sword fish works fine and can be easily traced as the grid is having 81 digit less. Please give you feed back Sir.

[@AndyA86]

very good sir. nice work with the explainations

[@wordoku]

@Sudoku Swami Thanks for your videos. These are the most complete, most accurate videos I have seen about sudoku on KZbin! I think they are great. Keep them coming!

[@SudokuSwami]

Thanks for this very kind message, Harold. It's an honor to receive such a wonderful compliment from someone who is a Master of Sudoku in his own right, and who also produces such fine instructional Videos. Really appreciate it, sir. Good luck! :-))

[@luispalou217]

Very well explained, thanks a lot

[@david341]

Best explanation of a swordfish in the whole internet. Please correct me if I am wrong, but I think in the example at min 17:53 we can also form a jellyfish!! with rows 2,5,6,9 as base sets and also get the same result! :D

[@jimcolbert138]

Very helpful, now I get it -- thanks!

[@prabhattomar4587]

Thanks, this video cleared all doubts on swardfish.

[@djmitt3807]

Your background looks like/ reminds me of my home state Pennsylvania!!

[@SudokuSwami]

It's not Pennsylvania....

[@ThatGuy-dj3qr]

Excellent explanation. I think I finally get the swordfish.

[@SudokuSwami]

That's great, Brian. Glad to hear it. I highly recommend that you now watch Tutorials #13 and #13-A, which should really "seal the deal" for you. Good luck! :-))

[@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!

[@Athallah_Zaidan]

Finally understand the swordfish in 2021

[@Roman-jh8kr]

Yuou are fanastic. Highly appreciate your effort.

[@SudokuSwami]

Thank you for your comment. :-)) Good luck!

[@eboy71]

Excellent demonstration - thanks!

[@SudokuSwami]

No problem. Glad to have you on board. :-))

[@francoisepichot181]

Thank you so much !

[@SudokuSwami]

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

[@s.b.easwaran7563]

Ah, was wondering if you were a former math professor, given your speech style. Just visited your site and read that you are a musician/songwriter! As a long-time sudoku buff, I'm familiar with all but the highly advanced techniques, but since stumbling upon one of your videos a couple of weeks ago, I've been checking out your channel for your sheer clarity of speech and explanation. By the way, I've picked up an Americanism I was unaware of -- kapish! :-) When I first heard you say it, I thought it must be a Yiddish expression, but then found out it has an Italian etymology. In India, though, Kapish is one of the names of the monkey-god Hanuman! :-)

[@yordanpetkov9259]

Благодаря! 🍊🍏🌶️🍋♥️🌹 Thanks! Mersi! 🙏

[@SudokuSwami]

Пожалуйста

[@stephenmneedham]

Check out Sudoku Guy, and his tie, an example of how different the advice out there is. Start @ 8:26 " Lesson 23. Review. The swordfish pattern ". BTW, I really appreciate all the feedback but I know I can tend to babble and I don't expect replies to all my utteranci.

[@SudokuSwami]

If you have sincere questions about Sudoku, I will always do my best to help you. Good luck!

[@pcalvan3534]

I used to watch the "Sudoku Guy" a long time ago. Until I stumbled on the Swami. The Sudoku guy is a nice man. But he has made mistakes and sometimes gives the wrong reasons about the logic of Sudoku. A good example is when he was showing XY wings. Telling you can delete certain candidates when you really could not. I never would have known this except by watching the "Swami" As he explains in detail the "Logic" of why we are eliminating certain candidates. Plus with the "Swami" we are using the correct terminology. I want to thank the Swami for all the hundreds of hours he has taken to help us all!

[@Oleo2320]

Thought the rule of 2-3 in a C or R is clear, (paused video) still could not see the swordfish before you pointed out, maybe if you showed examples why other columns or rows did not make the pattern could be helpful.

[@thebibleproof]

How could any thinking person vote you down 1. I subscribed :)

[@oumaroudia]

The answer is in the question: it takes all kinds...

[@ACwebseries]

What about a base row or column that has 3 candidates, 2 link up to form a swordfish but the 3rd candidate isn’t needed?

[@SudokuSwami]

I'm so sorry, but your question is a bit vague. Can you please restate your question and try to be a little more specific? Or you can send a puzzle example to me at: [e-mail] A standard Swordfish Pattern must have three Base Sets and three Cover Sets. There can be either 2 or 3 Instances of your Fish Candidate in each of the Base Sets. But EACH and EVERY Base Candidate must lie in one of three Cover Sets.

[@rezamiau]

in 19:00 you could also choose C3 , C4 & C7 as Base Sets. Thank you so much & Good Luck!

[@SudokuSwami]

Yes, you are correct! But please understand, in these Tutorials I am just jumping around showing random examples for demonstration purposes. We are NOT trying to SOLVE each puzzle. It's great that you can see other Patterns. It shows that you understand the principles. But please try to just focus on the particular point I am trying to make. Okay? Great! Good luck.

[@rezamiau]

@@SudokuSwami Okay , sure!

[@insoniazz8346]

imagine trying to understand this with bad english (no tutorial for my idiom x: ), but i think i got it, very nice video

[@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

[@Beth-ws5nt]

Thank you!!!

[@duststorm8737]

Excellent!

[@YotaXP]

In the last example at 20:40, could you also form a swordfish on columns 2, 5, and 8 to eliminate 8 candidates? And if so, could you also combine the eliminations made from both swordfish?

[@SudokuSwami]

No. That is not a Swordfish. A standard Swordfish occupies 3 Rows and 3 Columns. The configuration you pointed out occupies 4 Rows.....(Rows 1, 4, 6 & 9).

[@YotaXP]

@@SudokuSwami Aah, I see! I had a mistaken understanding that the candidates in the base row/column didn't necessarily need to be part of the swordfish. Thank you for this.

[@EquityPark]

At 5:02 in the video, what if you used row 4 and not 6 in the swordfish? It seems that it would change the results.

[@SudokuSwami]

The hand-drawn diagrams are not real puzzles. They are only demonstrations. Please try to focus on the point I am trying to make. Thanks. Good luck! :-))

[@sudokucafe]

How do we choose which columns or rows become the base set? I have been trying very hard to understand and I just don't get which three to choose.

[@SudokuSwami]

You don't "choose" them. You FIND them. They either exist, or they don't. You look for three Rows (Columns) that contain exactly 2 or 3 instances of the same Candidate, that also lie in the same three Columns (Rows), which are then the Cover Sets. It is all explained in the Video. If you really want to understand, please watch the Video again, and listen carefully to everything that is said and demonstrated.

[@sudokucafe]

@@SudokuSwami Thank you, I will watch again.

[@sudokucafe]

@@SudokuSwami My bad Swami, I should have watched Tutorial #13. Now I understand I was looking at fins in the Swordfish pattern. Thank you again.

[@pooka217]

Hi, in the example at 20.23 is there also a swordfish with the 3's in rows 1,2 and 3? It really looks like one to me. Thanks for the lesson!

[@SudokuSwami]

No. The 3's in those Rows occupy FOUR Columns. It COULD be perceived as a Sashimi Swordfish with either the 3 in R1C8 or in R3C9 as the Fin. But there would be nothing to eliminate from it, so it is an unfruitful configuration.

[@aliezn9858]

I understand how to apply swordfish, but i dont get WHY it is working ? Why this specific pattern allow me to eleminate candidate

[@SudokuSwami]

Well, it is all explained in this Video. I suggest that you watch it again, but this time, please pay attention to what I am SAYING, as well as what you are seeing. :-)) Good luck.

[@the3mperor1]

16:43 something is not understood, C4 and C5 are pointing pair leds to remove a 1 on C8, but if we used swirdfish we will have 1s on B4, B5 and C6, then if we used Line Reduction strategy we will delete the 1 on C6 which means the 1 on C8 in this time is true, can you explain please?

[@SudokuSwami]

Hello. In my Tutorials, we use R for Rows and C for Columns. If by "C4 and C5" you mean R3C4 and R3C5, then your comments make no sense. If I have misunderstood you, please write back and clarify your question using the R1C1 format for naming the Cells. Thank you.

[@the3mperor1]

Sudoku Swami i use letters for culomn from top A to bottom i, and numbers for row, from left to right

[@SudokuSwami]

If you would like me to answer your question, please use the following format. Rows = R (Horizontal), and Columns = C (Vertical). R1 thru R9 top to bottom, and C1 thru C9 across the top from left to right. The upper left Cell is R1C1 and the lower right Cell is R9C9. The top right Cell is R1C9, and the bottom left Cell is R9C1.

[@the3mperor1]

Sudoku Swami C5R3 and C6R3 are pointing pair leds to remove a 1 on C8R3, whice means a 1 on C6R3 is true, but if we used swirdfish we will have 1s on R2C4 and R2C5, then if we used Line Reduction strategy we will delete the 1 on C6R3 which means the 1 on C8R3 in this time is true, can you explain please?

[@SudokuSwami]

Dear friend, you must have given me the wrong time of the Video, because at 16:43 there is no Pointing Pair in R3C5 and R3C6. Please go back and watch Tutorial #2 on Terminology, and Tutorial #6 on Locked Candidates (Pointing Pairs). Also, when you are referring to Cells, the R Value should come First, like R3C2......(not C2R3). If you cannot use proper nomenclature, and if you cannot express your question clearly, there is no way I can give you a clear answer.

[@dineshreddy3766]

Hi, why did u take 2, 6 and 8 as base sets? y didnt u take row 4?

[@SudokuSwami]

Hello Dinesh. I cannot answer your question unless you specify the exact time in the Video you are referring to. I have no idea what example you are talking about! :-))

[@SudokuSwami]

The hand-drawn diagrams are not real puzzles. They are only demonstrations. Please try to focus on the point I am trying to make. Thanks. Good luck! :-))

[@syamsunderracherla154]

I have 2 doubts please. 1.If more than 3 base or 3 covers sets are found, can it be take any three? 2.If Base sets and Cover sets have only 2 to 3 candidates,can i try sword fish?

[@SudokuSwami]

1. If you have MORE than 3 Base Sets, then it is NOT a Swordfish. 2. The Cover Sets can have any number of Candidates. The Base Sets in a Standard Swordfish must have either 2 or 3 Candidates. Sashimi Swordfish, have a different set of Rules.

[@syamsunderracherla154]

Thank You@@SudokuSwami

[@thsone]

At 13:38... y couldn't row 2, 3, and 9 of the 3s... be considered a swordfish?

[@SudokuSwami]

No. Sorry my friend. The Candidate 3's in those three Rows, occupy FOUR Columns. In a Standard Swordfish, the Fish Candidates must occupy only THREE Rows, and THREE Columns. So the configuration you are referring to, does NOT qualify.

[@s.b.easwaran7563]

Hello! You mention there are 34 possible configurations of swordfish. Could you elaborate? By my calculation, there are eight permutations of swordfish (call them patterns, if you like), running from 2-2-2 to 3-3-3, with 3-2-2, 2-3-2, 2-2-3, 3-3-2, 3-2-3, and 2-3-3 in between. That is to say that in the first pattern each of the base sets has two instances of the swordfish candidate, and in the last one three instances each, with the other permutations in between. So do tell us what you mean by configurations, and how they are to be counted. Of course, it's not at all necessary to know this to spot swordfish and solve them, and you might say this amounts to splitting hair, but the 34 got me curious. All along I've thought of swordfish coming in eight patterns. So do explain, please.

[@SudokuSwami]

Imagine the Base Sets are in the Rows, and imagine the upper-most Base Set is in Row 1. And now imagine that the Cover Sets are Columns 2, 4 & 6. There are FOUR variations for the Candidates in Row 1. 1.) All three Columns, 2.) Columns 2 & 4 only, 3.) Columns 2 & 6 only, and 4.) Columns 4 & 6 only. If you work this out, with the combined variations for all three Rows of the Swordfish, you will find that there are actually 64 total shapes. But 30 of those shapes must be eliminated because of the resulting Single Candidate in one of the Columns, or because of a completely empty Column. This leaves exactly 34 valid Swordfish Patterns.

[@s.b.easwaran7563]

@@SudokuSwami Ah, thank you. Let me work that out on an empty grid. Thanks again!

[@SudokuSwami]

Okay. Good luck! The only reason I mentioned that statistic, is to make the point that in order to find Swordfish, you should look for Conjugate Pairs that line up. Only ONE of the 34 variations, contains all NINE Candidates. 33 will contain at least ONE Conjugate Pair, and 27 will contain TWO Conjugate Pairs. This is a very good thing to remember.

[@s.b.easwaran7563]

@@SudokuSwami Absolutely right! I didn't think of that! Thank you!

[@SudokuSwami]

Statistically, this means that almost 80% (27/34) of all Swordfish will be composed of at least TWO Conjugate Pairs.

[@peterlaudrup6148]

I don't get it. Why is row 4 not part of the fish-pattern. I think I missed an important point

[@SudokuSwami]

Please specify a time in the Video, for questions like this. Otherwise, how can I possibly know which example you are talking about? Thank you.

[@cv507]

Bud... where is barjüm bäck ladice vv Körrneastöne ^^