Sudoku Tutorial #70 Conjugate pairs and Links. (very powerful & essential to know)
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- เผยแพร่เมื่อ 20 ธ.ค. 2020
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These terms are ESSENTIAL if you wish to spot advanced patterns and therefore eliminate small numbers.
The TURBO FISH is a 3 link open ended chain using one particular small number. The Turbo Fish is one of 3 types of 3 link chains. In each case you have a Strong Link and Weak Link and a Strong Link. i.e. strong ,weak, and strong links I'll be covering the other 2 types of 3 link chains in the near future.
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I learned the basics from you in 2017.I had a serious health crisis andn ow I'm starting up again. Thank you for making shielding from the plague easier.
Glad I could help. All the best Helen.
I love this guy. Couldn't be further from the Cracking the Cryptic guys, but actually far more instructive. I was stuck on a hard puzzle then watched this and solved it. Well done, Sudoku Guy! Keep 'em coming
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This is so great ! I’ve been trying to learn and it’s helpful !!! Thank you 😊
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I love this guy and his lessons
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Thanks for each of your videos! I particularly enjoyed the one on stong-weak links. It's really helped when working on diabolical puzzles.
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Really needed this. Thank you. Merry Christmas
Happy holidays Jeff
Merry Christmas, Robin :) have a good one. Thanks for all your great Sudoku tips throughout the year :)
Same to you! Stay safe. Enjoy solving sudoku. Much to learn. Nothing like practice.
These little neat techniques shall be powerful enough to help bring down the complex web of little numbers formed invariably towards the end of expert level puzzles to neat order. My sincere thanks Sudoku Guy.
Absolutely! Hang in there r g Thanks for your comment.
This was helpful Robin. Thank you!
You are so welcome Angie
This strong link - weak link - strong link chain is really advanced. That’s amazing and very new to me. Theoretically, I now have 1 more weapon in my pocket and I’m very eager to try to spot them in the future.
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I love this guy .. love the videos ... keep them coming ..
Happy New Year KIM. There are many more coming Keep in touch by looking at the COMMUNITY tab on my channel page. 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.
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Great video Robin ... thanks. I'm pleased to see the acknowledgment to
Sudoku Swami.
Our pleasure! He is very good.
Link Differences> strong: if A is true B is false, if B is true A is false; weak: if A is true all other candidates are false, but if A is false nothing is known about the other candidates. Therefore, because of these strong & weak relationships, this results in most AIC’s (alternate inference chain) starting with a strong link and then alternating weak strong weak ending with a strong link AND ALSO starting by saying ‘If the first candidate has a strong link and is FALSE the next is True and the next link being weak one Knows the next candidate is False and then one knows with the next strong link the next candidate is True’, and keep alternating and end with a strong link and a true candidate.
Well said Gary
You are a great guy as a sudoku man
Gee thanks. Enjoy learning and spotting more.
Thanks for explaining conjugate pairs and turbo fish very nicely.
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@@SudokuGuy thanks
It's not called 'turbo fish', it's called 'turbot fish'. It's actually nothing more than an x chain with a length of 4.
Thank u sir.. From Bangladesh 🇧🇩♥️
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thankss :D and merry christmas :)
Happy holidays! to you too!
Great i love sudoku.do you solve mazes?
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Maybe I didn't understand you correctly, but I thought I heard you say that in a weak link if one is false the other must be true. That is not correct. In a weak link, it is possible for both to the false. However, you can say that if one is true the other must be false.
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@@SudokuGuy It's a good site and I have watched a few of your videos. However, you teach the "pencil and paper" method and I use a computer program because it is much faster and easier. I remember, before finding a sudoku computer program, spending several hours on one puzzle. Now I rarely spend more than 15 minutes on any one puzzle and often less.
Really helpful
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@@SudokuGuy sure i will share your channel
Good
Thanks
I lesernes sudoku inn 1 dsy cuz of you bit ONLY the easy level still got. More
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Hey y y you deleted the reply on my channel huh
Have a great Christmas, although you are all in lockdown😳 all the best from the Bahamas. Cheers🍷🍷🍷🍷
Happy holidays Peter. Yes we are in lock down and it snowed last night. Love the wine glasses.
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@@SudokuGuy Happy New year, hope all will better sooner than later, stay well. All the best Peter🥂🥂🍷🍷🍷🥳🥳🥳
I love your videos Robin, helped me a ton, but when you are explaining chains you kept saying that if the end point was true, then strong link value was false, thus weak link value was true! No, unless I am completely confused it doesn't work that way.
If end point is true, then since it sees the square in question, that square cannot be true. If end point is false, then you use the "chain." End point false, then Strong linked value true, so weak linked value is false, so strong linked value must be true, and since it sees the square under consideration, the value in that square is false. T
he "chain" cannot be used if end point is true, since the initial strong link value would be false, the weak link value does not have to be true, as there are multiple cells with same value along the weak link.
You are right, thank you for your comment.
Could you please explain the logic behind the requirement to alternate strong and weak links? Both links perform the same logical function, so I am confused as to why they need to alternate rather than being used in any order.
The turbo fish 2 string kite and skyscraper patterns all require 3 links.
they must alternate in order to have one end of the chian true and the other end false. Otherwise the puzzle cannot be solved. See more videos coming and look at tutorial 68. It is important to understand the a strong link (also called a conjugate pair) always has one end true and the other end false. Hang in there
How do you determine the end points when making conjugate pairs?
In a row or column the small number is found only twice.
Need advice if we have more than 2 matching pairs with 3rd no same in all ;say; 456 456 456
HI JAI this is not a matching pair but is called a 3X3 or triplet . I have many lessons and tutorial sof the 3X3 or triplet. See below on my channel page with all the videos
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So,you have probably already explained in another video but im a new subscriber and i haven't understood one thing.If there is the same pair in two empty cell in a row,how do i find which number fits in?
also sorry for my English but im from another country
Eldi thank you. This tutorial is for advanced players Below I have link where you can go the the beginners section where I explain matching pairs. In fact there are many lessons and tutorials which cover matching pairs. Here is a link where you can watch the videos in the language of your choice. th-cam.com/video/ocYLlvrJqKk/w-d-xo.html
I can even imagine those links together by logical explanations I don't even need to draw them to see.
Great Savage. thanks for joining in this morning.
🎄 Wish You Happy New Year 🎄
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I'm not sure about the logic with weak links: in the example on 11:04, when you say that the fact that r2c1 isn't a 9 implies necessarily that r2c6 IS a 9, IMO is wrong, as there are other options in box 2 that could be 9 (r3c5 for example, which would make r7c6 a 9, just the opposite of what you get from your deduction).
If anyone could shed some light would be great.
Thank you for your videos and your great channel!
Hi diego. I think you don't understand that in a weak link in this case we are only referring to the cells of the end of a link. In this case it is the end of a strong link. I suggest you watch videos I have done on strong and weak links and conjugate pairs. All the best. hang in there.
@@SudokuGuy thanks for your answer. I'll take a look at those other videos to find out what I'm missing or why my logic is wrong.
@@diegobolso2005 It's not YOU that doesn't understand. He is not explaining the 'turbot fish' correctly! (btw - it is called a 'turbot fish', not a 'turbo fish'.) And he is completely wrong when he says that since r2c1 is not a 9, r2c6 will be a 9.' The link between r2c1 and r2c6 is a WEAK LINK which means that both of them cannot be true but they CAN both be false! He is confused and completely wrong with his explanation. The correct explanation of that example is simply - if r3c3 is a 9, then r7c3 is not a 9. And if r3c3 is not a 9, then you can work through the chain and show that r7c6 is a 9 so r7c3 still cannot be a 9.
@@dongravelle1909 I knew so ;) but I was trying to have the author of the video rectify the error.
@@diegobolso2005 Oh! Ha! I thought that maybe I was the only one that realized that he had made that error. :)
For the strong-weak chain, logically, why can we say that if the second number in that chain is false, that the third is true when there are two other cells that could be a 5? I assume it just works, but I don't understand the actual logic.
I suggest you look at several tutorials which use strong and weak links. e.g. Tutorials 68-75
@@SudokuGuy Thank you!
It is not called a 'turbo fish', it's called a 'turbot fish' (which is an x chain with a length of 4). And he makes the same obvious mistake (at least 4 times) beginning at 8:19 and again at 9:16. He says if this is true (pointing to r2c3 being a 5), then this is not true (pointing to r3c1 being a 5). If that's not true, then this is going to be true (pointing to r3c7). Well, obviously r3c1 not being a 5 does not force r3c7 to be a 5! There are six 5's in row 3! (Remember, the blue link between r3c1 and r3c7 is a weak link meaning that they cannot both be true but they can both be false.) The correct way to explain the example is simply - if r2c3 is a 5, then r7c3 cannot be a 5! And if r2c3 is not a 5, then go through the chain and show that r7c7 is a 5 so r7c3 still cannot be a 5. He then makes the same mistake while explaining a turbot fish on 9's.
Hello Don, thankyou for your comment.
@@SudokuGuy Thank you for being open to my criticism! I have always been a nitpicker when it comes to detail!
Awful
Please explain why Luca.