One absolutely crucial detail they really should have emphasized, is that you must only have 2 candidates on each column to eliminate reduntant candidates on rows, or 2 on each row to eliminate those on columns.
I have watched quite a few Swordfish technique videos, and hadn't really got it until now. The key was when you pointed out and highlighted with different colors - "there are only two options, this way (green) or this way (blue)."👍 Now the hard part is seeing that pattern for one number within a sea of pencil notes. Now, something you should fix is that on the website, these videos are under the title of "Sudoku Rules" while they are really tips or tricks.
I made a program that could, sort of solve sudoku, but it would show me all the possible combinations too, and situations like this seems to pop up a lot, had no idea it had a name! Thanks! Coding something to solve this seems, really challenging, haha. It was only fun making a basic tool to help. 😭
I've been doing this for years but never knew what it is called. You play enough hard sodoku puzzles and you'll inevitably and inadvertently learn all the advanced techniques
Unfortunately they neglect to mention that you need 3 rows where 6 occurs twice and it must also occur in 2/3 columns of the corresponding rows. So row 7 cannot be used even though it has two 6s because those 6s do not line up in columns with the 6s of the other rows. Hopefully this explanation makes sense.You can actually have three 6s in a column and/or row, it mostly matters that you have at least 3 pairs of 6s that line up along 3 columns and 3 rows. This video explains it better: th-cam.com/video/_pqEqn_E57A/w-d-xo.html
I think it has to do with the possible configurations. You have to have three rows/columns with the same number in two different cells who's configurations can only have two states
Unfortunately they neglect to mention that you need 3 rows where 6 occurs twice and it must also occur in 2/3 columns of the corresponding rows. So row 7 cannot be used even though it has two 6s because those 6s do not line up in columns with the 6s of the other rows. Hopefully this explanation makes sense.You can actually have three 6s in a column and/or row, it mostly matters that you have at least 3 pairs of 6s that line up along 3 columns and 3 rows. This video explains it better: th-cam.com/video/_pqEqn_E57A/w-d-xo.html
@@dunnetahl But there are also two 6's in R5 that do align, why was R5 not selected? Is it because R5 has additional cells that also have 6 in the notes? I'm kind of answering my own question as I formulate this.../
Unfortunately they neglect to mention that you need 3 rows where 6 occurs twice and it must also occur in 2/3 columns of the corresponding rows. So row 7 cannot be used even though it has two 6s because those 6s do not line up in columns with the 6s of the other rows. Hopefully this explanation makes sense. You can actually have three 6s in a column and/or row, it mostly matters that you have at least 3 pairs of 6s that line up along 3 columns and 3 rows. This video explains it better: th-cam.com/video/_pqEqn_E57A/w-d-xo.html @@santosh8773
@@santosh8773the two 6s in R7 do not align each with a 6 of a different row. Note that this pattern creates pairs in ach row. The way it was done in the video, R9 and R6 forms a pair, R9 and R1 forms a pair and R6 and R1 also. Note that every row has 2 different pairs. If we've choosen R7 that wouldnt be possible AND we'd need another column, which creates a pattern with 3 rows and 4 columns, which doesn't really means anything. Pay some attwntion on the video at the part where they highlight the possibilities for sixes in green and blue, if you'd choosen R7 there would be more possibilities.
@@nobody08088 Idk about that. I started using them a couple of weeks ago and they are really not my thing. Puzzles become as engaging as a shopping list imo.
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Both the description on the website and the video on TH-cam are so laconic that they explain nothing.
One absolutely crucial detail they really should have emphasized, is that you must only have 2 candidates on each column to eliminate reduntant candidates on rows, or 2 on each row to eliminate those on columns.
I have watched quite a few Swordfish technique videos, and hadn't really got it until now. The key was when you pointed out and highlighted with different colors - "there are only two options, this way (green) or this way (blue)."👍
Now the hard part is seeing that pattern for one number within a sea of pencil notes.
Now, something you should fix is that on the website, these videos are under the title of "Sudoku Rules" while they are really tips or tricks.
There are two 5's in C6. I think the one in R9 row is supposed to be a 7.
Well said, I immediately understood the link between the application of the x-wing technique and this one.
I made a program that could, sort of solve sudoku, but it would show me all the possible combinations too, and situations like this seems to pop up a lot, had no idea it had a name! Thanks! Coding something to solve this seems, really challenging, haha. It was only fun making a basic tool to help. 😭
funny that this is the top comment. I'm also currently trying to code a tool to solve sudoku's.
I've not gotten very far yet, though haha
@@TheGrimravager I ended up just keeping my tool basic. It was easier to code and feels less like cheating.
wow how to explain somthing terribly in 1 minute...
It vaguely explains how to do it, but doesn't give all the rules for the technique, or explain why it works.
I thought it was just me. 😅😅
I understood it pretty well though 🤔
I literally have no idea how she chose those sixes. I can see loads of sixes that she didn't choose 😕
@@nicholaspurcell5960 it is similar to xwing,you choose 6s that are only pairs on a row
I've been doing this for years but never knew what it is called. You play enough hard sodoku puzzles and you'll inevitably and inadvertently learn all the advanced techniques
How do you know what your base sets are
HOW were those sixes selected to begin with, and so many other sixes were ignored?
Unfortunately they neglect to mention that you need 3 rows where 6 occurs twice and it must also occur in 2/3 columns of the corresponding rows. So row 7 cannot be used even though it has two 6s because those 6s do not line up in columns with the 6s of the other rows. Hopefully this explanation makes sense.You can actually have three 6s in a column and/or row, it mostly matters that you have at least 3 pairs of 6s that line up along 3 columns and 3 rows. This video explains it better: th-cam.com/video/_pqEqn_E57A/w-d-xo.html
I'm confused as to what she means by "base sets". Can someone please help.
These tutorials have been very useful, although the last 3 advanced ones could do with a more detailed explanation.
But how do you know if the numbers qualify 😭 I’m still confused. I get the x wing method but don’t get this
why wasnt R7 included? it also has two options for 6
I think it has to do with the possible configurations. You have to have three rows/columns with the same number in two different cells who's configurations can only have two states
Unfortunately they neglect to mention that you need 3 rows where 6 occurs twice and it must also occur in 2/3 columns of the corresponding rows. So row 7 cannot be used even though it has two 6s because those 6s do not line up in columns with the 6s of the other rows. Hopefully this explanation makes sense.You can actually have three 6s in a column and/or row, it mostly matters that you have at least 3 pairs of 6s that line up along 3 columns and 3 rows. This video explains it better: th-cam.com/video/_pqEqn_E57A/w-d-xo.html
@@dunnetahl But there are also two 6's in R5 that do align, why was R5 not selected? Is it because R5 has additional cells that also have 6 in the notes? I'm kind of answering my own question as I formulate this.../
@@michelewonder5808exactly. Note that the other selected rows only have two 6s notes
this is not swordfish, 6 in 3x3 is swordfish, this is some x-wing version.
Used it many times without knowing it's called swordfish!!
Aw, so quick and exact explained.
Amazing, some sudoku teachers use looooots of words and consume time for the exact same thing.
Congrats.
What happens if we use row5 instead of row 6?
I think the reason we do not include that option is that 6 does not appear just twice in that row. In the other rows there are only two sixes.
@@aidandavid6681so, in that case can we use R7 instead of R6. R7 has 2 6s same as R6
Unfortunately they neglect to mention that you need 3 rows where 6 occurs twice and it must also occur in 2/3 columns of the corresponding rows. So row 7 cannot be used even though it has two 6s because those 6s do not line up in columns with the 6s of the other rows. Hopefully this explanation makes sense. You can actually have three 6s in a column and/or row, it mostly matters that you have at least 3 pairs of 6s that line up along 3 columns and 3 rows. This video explains it better: th-cam.com/video/_pqEqn_E57A/w-d-xo.html
@@santosh8773
6 would appear in 4 columns which breaks the rules of the pattern I believe
@@santosh8773the two 6s in R7 do not align each with a 6 of a different row. Note that this pattern creates pairs in ach row. The way it was done in the video, R9 and R6 forms a pair, R9 and R1 forms a pair and R6 and R1 also. Note that every row has 2 different pairs. If we've choosen R7 that wouldnt be possible AND we'd need another column, which creates a pattern with 3 rows and 4 columns, which doesn't really means anything. Pay some attwntion on the video at the part where they highlight the possibilities for sixes in green and blue, if you'd choosen R7 there would be more possibilities.
Error : no 7 in R9 !
👍
I did not understand
Is using notes really that common? I personally don't use them at all but most of this techniques involve notes.
notes are incredibly important especially in harder sudokus
@@nobody08088 Idk about that. I started using them a couple of weeks ago and they are really not my thing. Puzzles become as engaging as a shopping list imo.
@@ReinBelmont if you're doing easy puzzles then there's no point really
@@cro9364 I guess, havent touched Evil dificulty yet
@@ReinBelmont You're the first person I've ever met that doesn't use notes. Almost everyone uses them. They're there for a reason.
Wow… this HAS to be for 6yr olds
Always so disappointing when these tutorials teach everyone to pronounce Sudoku wrong.😖
whats wrong with it