Excellent explanation. I am following your all the sudoku tutorials. Superb.
@jaapjaap1
4 жыл бұрын
Fantastic set of videos. Very clear structure (short explanation, examples, explanation of the why, more examples), very clearly articulated (consistent words, no surplus words) and made digestible (intro, the board, final words in person). Momentous effort to have made this complete set of video's. A very big thanks!
@SudokuSwami
4 жыл бұрын
I really appreciate your comment. Thanks very much! Hope you stick with it. Good luck. :-))
@karabishopart4153
3 жыл бұрын
Brilliant teaching as always now to find them in real puzzles!
@david341
6 ай бұрын
This videos are amazing Swami, I guess the origin of the name "sashimi" comes from the fact that the fish "was sliced" before being served. Please correct me if I am wrong, but in the example at minute 32:33 I can see also another Sashimi Swordfish with base sets columns 4,7,9 the fins would be at r78c7 and we can eliminate the 5 at cell r9c8
@jasontodd7236
3 жыл бұрын
Great video. Didn’t know these variations existed until I watched this, and now I understand how to look for them. Thank you
@noeldillabough
2 жыл бұрын
Agreed, I never heard of finned / sashimi fish strategies until this course...great stuff!
@imlct8431
Жыл бұрын
a complete logic is those who really understood sudoku.
@zuzanaschmidtova9564
5 жыл бұрын
“Why the name - Sashimi?” Hi Sudoku Swami, Thank you for all the comprehensive and clearly put information about Sudoku solving tactics! Well done for making them so accessible and user-friendly…Much appreciated! In one of your videos, not sure if this one, you asked, why is the Sashimi fish - the particular type of fish that is incomplete (missing one of its Base line components) and that is sporting a fin - called a Sashimi fish (swordfish or other). I tried to look up the answer and couldn’t find one, but I made up my own, which is now helping me to remember how to construct one, and what parts of the grid it affects. Perhaps it could be helpful to others, so I thought I’d share it here. Sashimi, is a traditional Japanese meal of raw thinly sliced fresh fish, pieces of which are often served on a rectangular shaped units of rice - blocks of rice.The name itself means ‘pierced body’ (from the way it's killed)- which I translate into not-pristine, tarnished or simply incomplete when it comes to Sudoku. The name therefore helps me to remember, that for instance a Sashimi Swordfish is an incomplete Swordfish, that one of its outlining base candidates is missing > the outline is interrupted or ‘pierced’. And the fact that Sashimi is served on ‘blocks’ of rice helps me to remember that a Sashimi Swordfish also has to have a fin lying on the base line that is missing the candidate, because I know that fins limit the effective candidate eliminative power to only the one 'block' in which they appear on a base line. And I remember that fins have this limiting effect, because I imagine that a fish with an extra sticking out fin would be constricted in its movement and therefore hunting power - the extra fin would be a hindrance - therefore I imagine that such a fish would catch smaller ‘meals’ - fewer candidates that can be safely eliminated from the grid. In turn, I remember that a complete Swordfish is a formidable tool slicing through the grid with a mighty eliminative power using only ‘one digit’ candidate and several rows and columns, because of the imagery of the ‘one’ fish (one digit) being thinly sliced. The meat of the fish, its muscles running along the spine are for me the base lines holding either the conjugate pairs or 3 house mates, and the perpendicular cuts are the cover lines that slice away any redundant candidates that aren’t ‘the meat’. I also imagine it this way: a swordfish is a great hunter and effective slasher of fish. It inserts its sword-like bill, with little teeth dotted along its sides, into a school of fish and it thrashes its head side to side with a mighty acceleration in order to injure as many of them as possible, to easily pick them off after. So I think of the long bill and the movement that the swordfish makes that is perpendicular to the bill's extension to remind myself of the crossing lines that highlight the base candidates that delineate the Sudoku Swordfish and that it is the lines that are perpendicular to the ones holding the base sets, that do the elimination. Perhaps someone will benefit form this. Enjoy your puzzling! : )
@SudokuSwami
5 жыл бұрын
Wow, Zuzana! Thank you for this very imaginative and entertaining essay. :-)) I am happy to know that you have found a way to help you envision the Sashimi concept, and hopefully this might help others, too. I am also glad to know that you are apparently benefiting from my Tutorials. May I ask where you are writing from? (I think I know....) In any event, good luck!
@zuzanaschmidtova9564
5 жыл бұрын
@@SudokuSwami Hi, thanks for your reply :) I am a Czech girl, living in the UK, soon moving for a while to Australia :D Where are you from, if I may ask? I like the countryside behind you in some of the scenes. Very nice.. And all your videos are very nicely done. Thank you for taking the time to make them. All the best wishes, Z
@SudokuSwami
5 жыл бұрын
Great. I will look forward to your message. :-)) In the meantime, Happy Solving!
@zuzanaschmidtova9564
5 жыл бұрын
@@SudokuSwami Thank you! Same to you! Namaste, Swami Sudoku-Gi : )
@dacrazyrazor
5 ай бұрын
It all comes down to sashimi vs sushi. The rice is missing. Actually good way to remember it.
@mithical1938
3 жыл бұрын
Excellent explanation and visualization, thank you
@kolst8406
Жыл бұрын
In the example at 11:00, there's also a finned swordfish for candidate one in columns 3, 6, and 9 that leads to the elimination of the same candidate.
@scuttyrht6697
Жыл бұрын
In 13:12 column 3 works too right?
@scuttyrht6697
Жыл бұрын
But it would be a Dead Swordfish though
@jpg7616
18 күн бұрын
22:30 I know you’re teaching swordfish but this looks like an X chain on the 2s. Would eliminate the same candidates in that box plus the 2 in row 6 column 4.
@stvcolwill
4 жыл бұрын
While pausing the video to find them on my own before you reveal the find and the logic, I found a different sashimi swordfish at 27:37 which yields the same results (same naked single result). There's one at Column 1, rows 2 & 4; Column 6, rows 2 & 7; and Column rows 4 & 7 with fins at C6Rs8&9. this eliminates the 1 at C5R7 yielding the same naked 1 in row 1.
@SudokuSwami
4 жыл бұрын
Yes, you are correct. This is a common occurrence. Glad to know that you understand the principle. Good luck.
@ximorro5247
4 жыл бұрын
@@SudokuSwami Interestingly enough I do the same pausing the video and in this one I found YET another variation in the same fish. My base sets are as with Swami in C159 but my cover sets are R247 (instead of R147), being the fin R1C5 and eliminating R2C6. With all these variations it seems it's easy to find one of them but omg I needed SO MUCH time till I found this. And this is knowing in what canditate to search and knowing that it exists for sure. Searching for this in a sudoku where maybe there is no one will be very time consuming... and I cannot image searching for a sashimi jellyfish, oh boy...
@SudokuSwami
5 жыл бұрын
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
@CasaErwin
3 жыл бұрын
I don't know why, but I rather suspected that was you playing the piano in the introductions of all those videos I watched. Kudos!!
@SudokuSwami
6 жыл бұрын
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!
@rocteur
2 жыл бұрын
Great video and finally, I think I have understood the Finned Sashimi Swordfish; however, I need a place to practice, if I wait until I get one in my next puzzles I will probably have forgotten the techniques by then. What app or websites do recommend. I play the daily Enjoy Sudoku puzzles against my wife, but I need a good app or site to practise where I know in advance the puzzles will contain the type of problem I'm trying to solve, any recommendations and once again, thank you!
@doralrobichaud8838
5 жыл бұрын
Hi Sudoku Swami, I haven't watched your tutorials further than this one yet so you might mention this in those but I have to ask while I'm thinking of this question: - Can a swordfish or any other fish (other than an x-wing) be considered an AIC? Thank you again for the great tutorials.
@SudokuSwami
5 жыл бұрын
Hello Doral. Thank you for your interest in my Channel. The answer to your question is, "Yes, it is POSSIBLE, but not necessarily so." You could make an AIC out of ANY Fish Pattern, but ONLY IF each Base Set has EXACTLY TWO CANDIDATES. This is because the Base Sets would have to act as your Strong Links in the Chain. So if you had 3 Candidates in any Base Set of a Swordfish, or if you had 3 or 4 Candidates in any Base Set of a Jellyfish, (for instance), you could NOT make an AIC out of it. But you don't NEED to make an AIC, in this situation. The Fish Pattern, is all you need. Even if an AIC is possible, (by meeting the 2-Candidate per Base Set requirement, as stated above), the Fish Pattern will provide you with the SAME Candidate eliminations.
@SudokuSwami
6 жыл бұрын
Be sure to visit sudokuswami.com for an Outline of the Entire Course, and news about upcoming Videos!
@nisarsheriff9576
5 жыл бұрын
Swami Ji, In your videos if we can have a facility for 10 seconds forward, it will help a lot when we come back to revise the instruction. We can skip forward to the relevant instruction instead of seeing all the loading instructions etc. Thanks, Nisar
@SudokuSwami
5 жыл бұрын
You can use your mouse or your fingertip to scroll or skip immediately to any point in any video.
@michelelocigno4520
4 жыл бұрын
Hallo Sudoku Swami, first of all compliments for your work. At 11:12 it seems to me that there is another possible Finned Swordfish that leads to the elimination of the same candidate 1 in R7C6 : it is composed by Columns 3, 6 and 9 as Base Sets, and Rows 1,2 and 7 as Cover Sets, with the fin again in R8C6. Is it correct? Thank you
@SudokuSwami
4 жыл бұрын
Yes, you are correct. This is a common occurrence. Good job, spotting it. Good luck!
@montesimpson7954
4 жыл бұрын
I’m looking for Sudoku software that provides filters for single candidates and manual coloring of individual cells, like you do in your videos. I find this makes it much easier to identify complex fish patterns. Which software are you using in the video?
@SudokuSwami
4 жыл бұрын
Write to me at sudokuswami@gmail.com for a complete rundown. Thank you.
@felicianolumini520
4 жыл бұрын
Hello Swami. First of all thanks for the superb tutorials. At 32:34, can we use columns 4, 7 and 9 as base sets, rows 3, 6 and 9 as cover sets and eliminate the 5 in cell R9C8?
@SudokuSwami
4 жыл бұрын
Yes. It quite often happens, that you can find multiple Swordfish occurring at the same time. Good luck! :-))
@nicorobinmiral5903
4 жыл бұрын
Hello.. Its a nice tutorial and helps me a lot.. Correct me if im wrong.. Isnt 18:51 is already a plain swordfish by column?
@SudokuSwami
4 жыл бұрын
No. For a Standard Swordfish, there would need to be a Candidate 4 in R2C6.
@pboneburt612
3 жыл бұрын
Hello again, at 26:45, the 3 in R7C1 cannot be eliminated why ? It's not in the cover set but it sees all the fins too....
@SudokuSwami
3 жыл бұрын
Two Cases: 1.) The Fins are BOTH False, or 2.) At most, ONE of them might be True. You can only eliminate other Candidates that would be False either way. The 3 in R7C1 would be False either way. Not so, for the 3 in R7C1. If both Fins were False, there would be no logical reason to eliminate the 3 in R7C1, because, as you correctly point out, it is NOT in the Cover Set.
@JonathanJimbo
6 жыл бұрын
That was a very well put together video, nice job! Thanks for showing me some very interesting examples. I'd never previously come across finned / sashimi sword fish with fins in 2 of the base sets (that lie in the same block). At 31:45 if R4C8 R5C8 could contain a 3, could I eliminate 3's from those as well? To elimiate R4C8 I could have just ad well chosen R4C7 and R4C9 to be the fish cells and the rest to be fins. Then similar for R5C8. In fact if any of C8 block 6 contained a 3 then the fins would be false and that would have put a 3 in single in R7C9 which would in turn put 3s in both cells in R3 which is a contradiction.
@SudokuSwami
6 жыл бұрын
If you viewed R4C7 and R4C9 to be the Fish Cells, instead of R6C7 and R6C9, there would be no Candidate 3 to eliminate. In a Fish Pattern, Candidate eliminations can ONLY be made in the COVER Sets. In your proposal, the only possible place for a Candidate elimination would be in R4C8, and that Cell does not contain a 3. The only way this particular configuration works as a a Finned or Sashimi Swordfish, and will produce any eliminations, is the way it is shown at 31:45, with Row 6 being one of the Cover Sets.
@JonathanJimbo
6 жыл бұрын
Sudoku Swami Thank you for your reply. What I meant was that if R4C8 and R5C8 did contain a 3 (which in this example they don't, but in other puzzles they might and I would like to make as many eliminations as possible), could the 3 be eliminated from those cells. Also could R6C8 still be eliminated if R6C7 was not able to contain 3.
@SudokuSwami
6 жыл бұрын
Jonathan, in a Fish Pattern, Candidates can ONLY be eliminated from the COVER SETS. So the answer to your first question is, "No." Rows 4 and 5 are NOT Cover Sets in this example. And the answer to your second question is also, "No." Without the 3 in R6C7 this would NOT be a Swordfish of any kind.
@JonathanJimbo
6 жыл бұрын
Sudoku Swami Thanks
@hosseinebrahimi3451
4 жыл бұрын
Since my puzzle game doesn't generate candidates automatically. Now I'm filling all the no. 1 candidates and at the end look for these patterns. Then go for no. 2 and look again and so on. Now i have a question. What minimum of cells should be already solved from e.g. no. 1 so i can look for fish paterns?
@SudokuSwami
4 жыл бұрын
First of all, I always recommend studying my Tutorials in strict numerical order, and not proceeding until you understand the previous Lessons. So you should first master X-Wings, (Standard, Finned, & Sashimi), before trying to learn Swordfish. Second, you are spending WAY too much time filling in Candidates by hand. Most, if not all, of the techniques I teach in the Complete Course, require seeing ALL possible Candidates. If you do not have an App that automatically fills them in, then you should watch my Pencil & Paper Method series of Videos. Good luck.
@petermcbrearty5422
3 жыл бұрын
Can you please explain why you chose candidate 3 in row 6...could you have just chosen the candidates 3 in row 5 ..one line above...... for the same outcome?......
@SudokuSwami
3 жыл бұрын
In order for me to answer your question, please specify the time in the video you are referring to.
@hosseinebrahimi3451
4 жыл бұрын
15:48 I paused and stared but no thing could detect. I don't know how to look at puzzle to detect these paterns.
@hosseinebrahimi3451
4 жыл бұрын
After watching swami find them i scrolled back and tried to see them for myself still couldn't. LOL [Pseudobulbar affect]
@SudokuSwami
4 жыл бұрын
It takes practice. Watch all the examples, and then watch Tutorial #13-A for review. If you can't see these, it's okay. Just try to master as many techniques as you can. Everybody has their own "specialties." Good luck.
@hosseinebrahimi3451
4 жыл бұрын
@@SudokuSwami Is it possible that me at this point of the course lack some knowledge that would help me find these patterns? Thinking isn't magic there must be something in your working memory while looking for these that help you process. My eyes randomly shifts through rows and columns until i get frustrated.
@johnnason2203
6 жыл бұрын
I just ran across a puzzle that had a sashimi swordfish and a sashimi x-wing. First swordfish I've ever played, which begs the question which do you run across more the the standard version or the finned/sashimi variants?
@SudokuSwami
6 жыл бұрын
Before I answer that, I have two questions for you: Was it the first Swordfish you ever played, or the first Sashimi Swordfish you ever played? Also, did your Sashimi X-Wing have one Fin or two Fins?
@johnnason2203
6 жыл бұрын
First swordfish I ever played, I may have had a half dozen for all I know in the past. After staring at this one for a very long time, I found myself saying that it could be a swordfish if only ... and that is when I went back to this video. The X-wing had one fin but it was separated by a solved cell. It was not a sashimi, I thought it was when I wrote the question. However, by the time the X-wing popped up I was already tuned up for it after re-watching the videos. Frankly if I had not struggled with the swordfish I am not sure I would have caught the X-wing.
@SudokuSwami
6 жыл бұрын
Okay, first. Swordfish come up a LOT. People miss them all the time. You would do well to learn how to spot them. Look for Conjugate Pairs. There is a 97% chance that ONE of the three base sets will be a Conjugate Pair. And there is a 79% chance that TWO of the Base Sets will be Conjugate Pairs. Don't forget that. Second, a Finned X-Wing can have one or two Fins. A SASHIMI X-Wing can really only have TWO Fins. If it has ONE Fin, then it is also a Skyscraper, and you are always better off treating it as a Skyscraper. To answer your first question, I would say REGULAR Swordfish are slightly more common than the ones with Fins (Sashimi or not). But It's probably close to 50-50.
@johnnason2203
6 жыл бұрын
Thank you for your insight and experience above and beyond your excellent instruction videos.
@krupakra
4 жыл бұрын
sashimi fish is callaed SASHIMI may be , may be becase it less than a complete fish, or a piece of fish not a whole fish. if not relevent just laugh at it and forget
@SudokuSwami
4 жыл бұрын
Yes, I think you are correct. But a beef hamburger is not a complete cow, and it is not called a Sashimi Burger. :-))
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