That's great. Glad to hear it. Thanks for your help. I really appreciate it.

Thanks very much. I really appreciate your continued support.

Excellent news! Good luck.

A Turbot Fish is NOT a Fish, by definition. Turbot Fish are similar in construction to 2-String Kites, in that they are both 3-Link X-Chains, as are Skyscrapers; they are all only different in shape. (Please watch Tutorials #14 thru #16). The rest are true Fish Patterns. I will cover Jellyfish and Kraken Fish in my Advanced Series. The others, I will not bother with, as they are unnecessary. Good luck. :-))

This is a hand-drawn diagram, to demonstrate a principle. It is not a real puzzle. You are supposed to imagine that there are many other Candidates that are not seen, and those three 9's in the Red Cells may or may not be there. I am saying that IF you have an AIC (a Turbot Fish, in this case), with the endpoints being the 9's in R1C5 & R7C5, then a 9 in any one of the Red Cells would have to be False.

Hello Bruce, the 6 in R3C7 was removed via a Discontinuous Loop, prior to finding the Turbot Fish. Good luck!

@@SudokuSwami Thank you for the explanation, but a Disc. Loop is currently above my "play grade". But that does explain how the strong loop is true. And so prompt with your reply! TY I am forging ahead and looking to all the revelations yet to come!

No problem. Good luck. If you have any other questions, please feel free to ask anytime. :-))

If you are using an APP that has candidate filters, it will make it easier for you to see the patterns. But if not, you can still do it. It just takes practice. Stick with it, and you will begin to find them, I'm sure. :-) Good luck!

I'd recommend Androku, if you are on Android. It helps a lot. Unfortunately, it has no filter to show ONLY pairs, ie, cells with only two candidates. Since most techniques seem to start with such a cell, it seems to me that spotting the solution would be much easier if such cells were to stand out.

Thanks, Slobodan!

Have to agree it isn't seeing the patterns started using HoDoKu which is pretty good.

@@SudokuSwami Hey swami, I thought of using an app as well to solve sudokus so I can use filters as well and I tried it but it kinda feels like cheating.. don't you think we should not use filters and try to recognise all the patterns by ourselves?

1. You start with a Strong Link. 2. It is possible to have many Chains exisiting at the same time.

Yes, it is actually a Strong Link. But you must understand that a Strong Link has the properties of a Weak Link, and can therefore be used as such when constructing Chains. For a Conventional Strong Link, where there are only two remaining instances of a particular Candidate within a House, you can also say, "If A is True, then B is False." Think it through. :-)) You need to go back and watch Videos # 3 & #4 where I explain that a Strong Link can be used as a Weak Link in any AIC. And when this is the case, I call it a "Surrogate Weak Link," to differentiate it from a Conventional Weak Link. The Link between the two 7's in Block 3 is a Surrogate Weak Link. (However, a Weak Link can NEVER be used as a Strong Link. It does not work both ways.)

​ Sudoku Swami I saw both Part 1 and Part 2 but i am still confused. I am sorry for bugging you but I really want to know why is it weak link. :( How is this different from 'Sudoku Tutorial #3-A Part 1' 7:27? These two 7's are the only 7 in that block similar to 2's in that video. You that was strong link...... Btw, your videos are very informative and helped me in solving harder puzzles. Thank you very much for all the videos posted in ur channel. :)

Okay, Dinesh. Everything I am about to tell you, is contained in Videos #3 & #4 and their Adjuncts. But because you seem like a nice guy, and you seem sincere about learning these principles, I will explain it again. :-)) Here is the formal definition of a Strong Link = If A is False, then B is True. Here is the formal definition of a Weak Link = If A is True, then B is False. Okay?? Yes, there is a Strong Link between the two 7's in Block 3, at 25:45 But please notice that the formal definition of a WEAK LINK also applies to those two 7's!!! If one of those 7's is True, then the other must be False, because there can only be ONE 7 in that Block! If A is True, then B is False. A Strong Link can ALWAYS be used as a Weak Link, because it has the properties of both. And when I use a Strong Link as a Weak Link, I always refer to it as a SURROGATE Weak Link, because it is ACTING as a Weak Link, to make our Chain. I have repeated this statement several times in all my Videos. The Strong Link between those two 7's CAN BE USED AS A WEAK LINK, because the DEFINITION of a WEAK LINK APPLIES TO IT. However, a Weak Link can NEVER be used as a Strong Link. It is ONLY a Weak Link. For an AIC (Alternate Inference Chain) the inferences must alternate between Strong and Weak. All that matters, is that you can say "If A is False, then B is True," for the Strong Links, and that you can say, "If A is True, then B is False," for the Weak Links. This is how the Chain will proceed in a logical manner. I'm sure if you think about this long and hard enough, it will eventually make sense to you. Good luck!

Your second assertion is correct. But your first assertion is INCORRECT. The middle "link" in a 3-Link AIC can be EITHER a Weak or a Strong Inference. All you need to be able to say, (for the middle inference), is "If A is True then B is False." This conditional statement applies to BOTH Weak and Strong Inferences.

@@SudokuSwami . Ah, but NOT to "effective" strong links. It is possible for both end points to be true, just as it is possible for both nodes of the weak link to be false. In fact, the only time both end points are true, is when both nodes of the weak link are false. If, of course, the middle link is a strong link, then one end point must be false and one must be true.

The Middle Link of a 3-Link AIC is never an "Effective Strong Link." The term "Effective Strong Link" only applies to two Candidates that DO NOT SEE EACH OTHER, yet there is a Strong Link between them.

@@SudokuSwami I never said the middle link was an effective strong link. I used that word because it's the word you use with reference to the end points when they can't see each other. But I can see now that you are incapable of admitting that I am right. And that's OK because I know I am. But I still like your videos.

Why would I not want to admit that you are "right" about anything? I am happy if you understand the principles I am trying to demonstrate. I said that in your original comment, you were correct about your second assertion, but that you were incorrect about your first assertion. I am just being factual and honest. Even though it is possible for both nodes of a Weak Link to be False, the conditional statement, "If A is True, then B is False," still stands. This means that the middle Link does NOT have to be a SURROGATE Weak Link, as you claim.

Hello Avi. Thank you for your interest in my Channel, and for your support. A 2-String Kite and a Turbot Fish are two slight variations of the exact same thing.....an X-Chain of exactly 3 Links. Thinking of them as two different "species" is only meant to help people identify them more easily. I hope you will tell all your friends about Sudoku Swami! Thank you. :-))

I have already told almost everyone to watch out your videos .......

Very soon .... your channel is going to be a big success ..... it is just a matter of time ....

Thank you very much. I hope you are right!! :-))