The subtitles make it difficult to follow your strategies, because they block cells in your examples. If that's not fixed it makes your video pointless
@@3s-sahajselfstudy 9 months late, it this is completely wrong. They are all useful (a lot actually, in id say 1/2 sudokus you will find a hidden pair.)
Thank you, thank you, thank you! This is EXACTLY the kind of video I've been searching for. So many Sudoku videos are long-winded and poorly demonstrated tutorials about one strategy. What I wanted was a single video with short, straightforward and stylistically consistent examples of the most common strategies, and finally I found one. I've abandoned many puzzles I know I could have solved if only I'd come across this video earlier.
A whole new world just opened up to me... I like the systematized presentation, with each entry using the same template, terms, and sentence structure. It makes for cross-referencing two techniques within the same ‘genus’ _(like naked pairs and hidden pairs)_ much easier to follow!
actually the difference between claiming pair and pointing pair wasn't quite clear to me at first. Eventually understood though that with the pointing pair the conclusion is based on the block while for the claiming pair it is based on rows/columns
Thank you. This is a great summary of basic techniques for easy to medium puzzles and are the first ones to learn if you are just beginning Sudoku. These will help you solve all three New York Times Daily Sudoku puzzles, which are great puzzles to begin with. Mastering these first 9 techniques will also prepare you for more advanced techniques like Y-Wing, Skyscraper, Hidden Rectangle and Swordfish.
I'm pretty proud of myself right now... I was stuck on a particularly difficult puzzle and came here thinking that there were many other strategies that I hadn't even considered. It turns out, however, that I'd managed to reason out 8 of the 9 strategies. All but the X-Wing, which was actually in the process of forming in my head (I had used it a couple of times in a truncated manner, but hadn't actually spent any time reasoning it out) when I watched this vid.
I am learning these strategies one at a time and am already solving medium Sudoku puzzles easily. I use cross hatching and ghost numbers to fill in as many cells as possible and then start penciling in numbers block by block and eliminate as many candidates as possible after each block
When I first solve a medium soduku puzzle, it took me more than a hour or two. Now I can solve it in 3 mins given a lucky puzzle and 7 mins on average. This is really helpful thank you
@@Blubb5000 You are right, but for me at the time, I was just learning and had good info for me. We all start somewhere and this is one of the places that I was starting. It is special to people that are just learning. No need to downplay the content. It isn't special unless it is new material to someone. That is when it is special.
@@JoelHershberger Look for the channel 'Cracking The Cryptic'. It's a channel from two UK Sudoku masters. They are awesome (and real life humans in flesh and blood). I guess you will enjoy Simon's method to explain the strategies to solve all sorts of Sudoku puzzles. From super easy to OMG!
never knew that i was using all these tricks without even knowing what they are called. The more you practice the more intuitions you get which indirectly teaches you tricks like these. I can finally sleep in peace knowing that my practice wasnt a waste of time.
I was using these techniques even before watching this video or any introduction. If you practice and think deeply you can understand most of them with the logic. For expert level I think you need to practice at least 2 years to understand it well. 35 minutes is the average for me to do expert level and it's got better and better by time.
2:18 example you have 2,6,9 on bottom two squares in the column, but you also have 5,6,9 in a row at the top. What made you choose the bottom 2 squares and not the top?
the upper middle block have three 9 (A5 A6 B5). but the lower middle block have only two 9 (H5 I5). So, the lower middle block's 9 have only two possibility, either it's H5 or I5, which is on the middle column (5th column). If you choose the upper middle block's 9 (A5 B5), the lower middle block will have no possibility of 9, which is against the rule.
I have been using almost all the strategies unconsciously in all of my games... Finally! Now I can understand it deeper because I know the name of that strategy...
I learnt from this video.... Now able to solve in 30 to 40 minutes the expert levels... Most important I found the naked pair, x wing, the naked quad and the triplets....amazing
At 2:58 for the naked tripple lesson you could also eliminate the 4s 6s and 8s from H5, G7, I7, and I8 since they are in the same row and block as the naked tripple.
Its interesting to watch this, because I know after 12 years of playing this game, many different techniques, but I came here to learn new ones on the fly... and realized I already use them but never knew what they were called -_-
Hi I was want ing to solve hard puzzle ever since I can pass the medium for 2 years ago. The hard puzzle so hard to solve thanks for the video. Love it and very useful and it does work 😁😉
In the "4. Pointing pair" exemple, the 9 from the middle-top block are eliminated because they are "pointed" by the 2 cells from the middle-bottom block. We could also have done the opposite and eliminate the 9 from the middle-bottom block. How do you chose in this case ?
The 9s in cells H5 and I5 in the middle-bottom block (Block VIII) are the only 9s in Block VIII, a requirement for a Pointing Pair. Being the only 9s in Block VIII, 9 has to be the solution to either H5 or I5. That means no 9 can appear in any other cells in Column 5 outside of Block VIII. But the pair of 9s in Block II are not the only 9s in Block II. They are not a Pointing Pair. Thank you for your interest in sudoku, and asking intelligent questions.
@@eliebordron5599 There are many more powerful strategies this video has not discussed. They are X-Chain, XY-Chain, Swordfish, Finned X-wing, Skyscraper, 2-String Kite, XY-Wing, XYZ- Wing, and more. I wish you luck with your program.
LA times, AARP, NYTimes, etc. provide online sudoku designed to play with this technique. You can set the settings such that the marked candidates are managed for you. We make mistakes if we try to fill or erase the cells ourselves.
First time watching a sudoku tutorial video. Been doing Sudoku for months now and I was able to think up all these techniques on my own. The only exception maybe being the X-wing technique (although I vaguely recall using it a handful of times in the past, but I would just forget about it). I found that one interesting and will activly remember to use it in future. Thanks!
You are smart!!! You may like to know what other techniques you might have thought up on your own. Go to my channel and you will find techniques such as Swordfish, XY-wing, XY-Chain, BUG+1, Uniqueness, and more.
Very useful video. I have still problems with Z and Y technics. I know but cant understand. Yet this thecnics thought in the video eneugh to solve an extreme hard sudoku. Thanks. Will watch again...
You have to have at last one 8 in any row so if all your options are together in one block you can be sure one of those 8 in your row are correct so you can delete all 8 that are in block and outside of row because you know your 8 has to be places in row. So you are just looking for any set of numbers that are missing in row and only span one area.
wow! thank you! I had managed to figure out all of them except naked triple and naked quad. Imma try a sudoku i've been stuck on tomorrow to see if that was the missing key.
Okay, so, X-Wing (3:12) - if I have a 2 in row 1 column 1, r1c6, r9c1, and r9c6, (r1c7,8,9 and r9c7,8,9 do not have 2s) besides the 2s that make the X, all 2s in columns 1 and 6 can be eliminated?
Sudoku Guy - So nice of you to visit my channel. I am very honored. Thank you so much for the comment. You are right, there are many strategies to solve Sudoku puzzles as you have shown in your channel, which is nothing less than awesome. Congratulations!
For the naked triple and naked quad examples, since they’re in a row, can I also eliminate the numbers that are the same as them in the blocks? Or I have to only do it to the pairs in whatever way they are (column, row, block)?
@@RFC963 Ok thank you. Thanks for all your videos! They helped a lot! I’m able to finish all the Evil Level sudokus on websudoku.com now just with using 7 of the basic strategies!
May I trouble you for the name or link for the Sudoku program that you use in your demonstrations. I like the ability of your program to use color and "strike through" options.
I may need some extra assistance for technique number 5. How do you know which numbers to single out? There was a column of three nines that could have been picked, as well. What is the deciding factor for which column/row gets picked? Hmm, nevermind, I think I'm starting to get it. Those eights were the only instance of eights in that row, so they had to be the ones to get an eight. I'm putting this into practice to see if I can understand better. Upon further inspection, I actually recently found this technique out on my own! I'm happy to find that after years of playing sudoku on and off, I know most of these tactics.
For #5. Claiming pair (triple) at 2:44, why can't the pair be vertical (A8 and B8)? (In this case it would be triple, with A8, B8, and C8). In other words, that would then make the pair or triple be vertical and then it would be the 8 in the bottom left corner of the block (C7) that is eliminated. Obviously, this seems to be the wrong thing, based on the solution of the puzzle that the video knows about, but as for working on it to get to the solution, it seems like this would be a valid conclusion at this time.
look at second block in row C. there is no candidate 8, which means the 8 has to be in block 3 in order to saticifie Row C (have all 9 numbers where it gets 8 from) thus, 8 has to be in Cell C7 or C8. in both case, it will elimiated cell A8 B8 having 8
There is a tenth one I may have discovered and it involves none of those strategies. Basically it would mean that if you have a free number and can put it anywhere, essentially, but when placing it one of the numbers doesn’t move from a specific cell that is where that number belongs. I tried it when playing a very hard difficulty when determining the spot for the number 5 by using a 9 and 8. I found that if I flipped the order for the 9 and 8 the free 5 had one cell in which it never moved. Although, I could be wrong because I only did it once; it is what let me beat the game without any mistakes. I think it is possible to do if you don’t know any of these tips (which I didn’t) as it is a form of logic (if something doesn’t change position no matter how different the other outcomes are in the hypothetical scenarios then it must be the correct area). It’s just a guess but I think I found it through stress and chance. 😅
This appears to be very basic information. Good help for beginners. I prefer to solve my Sudokus without writing in any numbers other than the solution. Learning to solve that way helps when playing online or using Sudoku machines. As I taught myself it was interesting to see the names you use for the various solving techniques. Thanks.
I haven't got around to watching your next viseo yet. Something to look forward to. I have been solving sudokus for so long I don't remmber when I started. I bough puzzle books initially when I had some time in hospital. I'm a messy person which is a major reason not to write anything in but the solution. It can take longer the way I do it but that is not a worry. I do two daily sudoku, three on Sunday in the local papers, plus an excellent monthly produced by Lovatts in Australia. They alternate hard and quick issues and the had is overdue by two weeks now. I should ge a subscription. I do recommend weaning off writing in numbers as soon as possble. It is more challenging but also more satisfying. My wife, who is some years behind me in sudoku is doing pretty well that way. When I get around to the next video I'll give some more feedback.
I see what is being shown now for #8...the naked pair is only found in the bottom block and the strategy works. I thought that the naked pair was being analyzed in the column, and of course that would not work. Thanks you for the good tip. Cheers
The pairs of 9s in the example are the only pair of 9s that lined up in column 5 in block 8. There are three 9s in block 2, and the 9s don't line up in a row or a column. Therefore the rules of pointing triple don't apply. I must again emphasize the importance of understanding the underlying logic of each strategy by checking out my other uploads in my channel. Thanks for you interest in sudoku.
Can somebody clarify the pointed pair 2:19 ? What if the candidate appears in three cells in the same block and row/column? Does the candidate outside of the block (same row/column) become eliminated?
The naked triple (4,6,8) under consideration is in row H. Only the other appearances of 4, 6, and 8 in row H can be eliminated. Thank you for your interest in sudoku.
I've been trying to learn more advanced techniques in sudoku and struggle to utilize them. Would I be able to send someone a pic of the puzzle I need help with and the person be able to explain how get to the next step?
This is actually very good despite robot voices. I would like to see more strategies if possible. Increasing the speed of the voices does make them more bearable.
What do you after you've done all the techniques and there are boxes with only 2/3 numbers in them? (when you can't eliminate any more but there are still pairs/3's left)
RFC963 Just keep doing what you're doing. A lot of people tend not to write properly on videos, so synthesized voice or not, the way you wrote it was crystalline. I cannot express how nice it was for me to find a video that was explained with such clarity...
RFC963 I didn't want to be rude, it's just that the robot voice is annoying, sorry. 😕 If you talked while showing the stuff you're talking about, not the whole text, it would definitely be a better quality video. Also it would be more personal.
I did not find you rude. I appreciate your comment. I found it somewhat humorous. I understand robotic voices can be annoying to many. I made some changes in my later uploads. If you would, please check out my recent upload : "Next Nine Sudoku Strategies Beyond The Top Nine Most Often Used". Thanks, and have a nice day.
Kinda hoped the infamously difficult-to-spot Empty Rectangle might have been discussed here... :-( Tricks adequately explained, still let me add some info to three of them to make them 100% true: 2:25 Could also be true for the Pointing Pair of 9s up in the same column! 2:40 Only true because Row C doesn't leave room for an 8 to fit elsewhere. If it did, there's also a Claiming Triple of 8s true for the same block (in column 8). 3:35 If indeed they are in the same column or row, these candidates appearing in other cells than the Hidden Pair, may (must) also be eliminated! PS and then there are, of course, the three variants to the X-wing: namely the Y-wing, the Skyscraper and, dare I say it, the Swordfish :-)
2:25 The bottom pair 9 is the only 9's in the block. Not so for the top pair 9. PS You may want to check out my other uploads if you want to know about XY-wing, Skyscraper, Swordfish, and others, such as XYZ-wing, X-chain, XY-chain, BUG+1..........
i somehow stumbled on this interesting video while looking at making home-made pasta. Damned if i can figure how it popped up. It adds some useful rigor to intuitive techniques that I have been using. I am curious if anyone has seen anything about or themselves used a technique I discovered that is a variation of their #9, where we use the assumption that every puzzle has a unique solution (which i think is solid, since the puzzle makers cannot practically offer multiple solutions), use this assumption to eliminate unique pairs in the corners of an "X" as they show it in #9. i.e., if you have a unique pair (no other candidates but those two) on one "leg" of their"X" (i.e., same row/column within same box), and that same pair appears in the opposite leg in the other box, then that second leg's pair must include other candidates, (otherwise if there were no other candidates in that second "leg" but that same pair, then that pair of candidates could could be used interchangeably in both both legs, and there would be NO UNIQUE solution to the puzzle. Therefore, since there MUST be a unique solution, one of the two legs MUST have one (or more) candidates in addition to the unique pair. Put another way, a unique pair in the same row/column of a box will not permit that same unique pair to exist in the corresponding corners of an "X" formed in another box. Has anyone run across this?
Wow, you are a very smart man! What you have described is a strategy known as Unique Rectangle, UR for short. It is a very advanced technique. There are several variations under this title. I shall upload videos on UR in the future. Thank you so much for you comment.
Dont know about smart, but i do enjoy logic. I actually came to this UR thing because i was trying to figure out if there is a system of linear algebraic equations, put into a matrix, that would describe any given puzzle. That is, we are solving N equations in M unknowns, where N is greater than M, which implies redundant solutions, otherwise, if they were equal, then their would be one unique solution, but it would take a computer (or a handy matrix, but I never got that far) to solve in a reasonable amount of time. The greater N, the more redundancies, the easier the puzzle. In the process I began to play with how to create not solve them. I noticed that for any solved puzzle, you could transpose any pair or any three rows or columns 1-3, 4-6, 7-9 and generate a new (different) solved puzzle. Kind of like if you shuffled, within the "boxes", row or columns. So I am thinking that this would be a great bar bet, how fast could you create a puzzle, (would have to be a certain kind of bar i guess) Thats when i realized the requirement for unique rectangles. Then i tried to figure out what is the fewest number of clues you could provide (known cells) and still create a solvable puzzle? i ran across one that offered only 22, and that took me almost an hour to solve! Most of the others rated as difficult I have seen offer 24 or 25. I understand that this must be a function of which cells you choose to offer as known, and that at least one be redundant, and the fewer redundant you offer, the fewer you will need to offer in order to solve. Conversely, the more non-redundant cells your offer, the easier the puzzle. Intuitively, I can see that the absolute fewest number of known cells you must offer is going to be somewhere between 10 and 18, and I am guessing closer to 18. And virtually every puzzle i have seen has clues offered in cells that are symmetric about the upper left/lower right diagonal axis. So this tells me that there is a clear logic to which cells are offered as clues, and that all puzzle makers probably use the same algorithm for making their puzzles. I was starting to get pretty adept at solving, and times were coming down, and oddly, i was solving the harder levels faster than some of the easier ones. The UR was really accelerating the solutions. So I am liking it and thinking, i wonder if i could compete? I go online, and I do some "evil" rated puzzles and my times are around 20 minutes, and I see that the average, for "evil" is 7 minutes. What? if the typical puzzle has 25 knowns, then it has 56 unknowns, and that means you are entering cells at the rate of one every 7.5 seconds ON AVERAGE! I tried to game it by writing down the puzzle on a separate sheet, hitting pause, solving off-line, and reopening the puzzle just to transcribe the answer. Granted my ipad app is slow and hangs up, but it still took 3 minutes, leaving four minutes to solve. I don't buy it. Either they are gaming the system, or these are just savants. But that is the AVERAGE---how many savants can there be? Or, somebody developed the matrix i was working on. Is that out there on another You-tube? Just wondering
+reconllc I have dubbed this one the unique solution rule and find it a useful thing to remember also for other Sudoku style problems. It doesn't necessarily work for coloured Sudokus as the numbers CAN be in same positions if they are different colours.
Thank you. I did not understand the pointing pairs...and why it was also called triples, and why Block 2 was not kept instead of block 8 ? Actually there were so many 6 and 9s in every cell in this Sudoku puzzle that I am confused why that particular was chosen among them all?
At 3:09, the X-wing, you know more than presented here! You also know that a 9 must be in column 8, that is D8, E8, or F8. In this case it's obviously E8 because D8 and F8 already have values.
You will find detailed explanations on many strategies if you visit my channel and check out my other uploads.
What your channel Rife
The subtitles make it difficult to follow your strategies, because they block cells in your examples. If that's not fixed it makes your video pointless
@@norman4628 The video looks just fine on my desk top. Thank you for your interest in sudoku.
My best for an easy sudoku is 1:10 is that good because google never gives me a straight answer
ruclips.net/video/Y4sorf-uj8c/видео.html
The fact that I learned all of this strategies by myself just by playing sudoku makes me happy
You are smart. I'm happy for you,
ALL of these?
@@N0Xa880iUL yup, ALL of those
@@meli6089 You're smart
*just* by playing? so you discovered them? 👁👄👁
Trust me Put the video speed on 1.5x
Thank you.
4x
Thank you
2x
Trust me, just skip this video
1:16 naked single
1:34 hidden single
1:56 naked pair
2:11 pointing pair (triple)
2:31 claiming pair (triple)
2:47 naked triple
3:05 x-wing
3:24 hidden pair
3:42 naked quad
Last three seems to be derivatives only. (Not useful)
@@3s-sahajselfstudy ur mom
@@3s-sahajselfstudy 9 months late, it this is completely wrong. They are all useful (a lot actually, in id say 1/2 sudokus you will find a hidden pair.)
What about Y wing technique?
ruclips.net/video/Y4sorf-uj8c/видео.html
Thank you, thank you, thank you! This is EXACTLY the kind of video I've been searching for. So many Sudoku videos are long-winded and poorly demonstrated tutorials about one strategy. What I wanted was a single video with short, straightforward and stylistically consistent examples of the most common strategies, and finally I found one. I've abandoned many puzzles I know I could have solved if only I'd come across this video earlier.
A whole new world just opened up to me...
I like the systematized presentation, with each entry using the same template, terms, and sentence structure. It makes for cross-referencing two techniques within the same ‘genus’ _(like naked pairs and hidden pairs)_ much easier to follow!
Thank you for your comment. Regards,
actually the difference between claiming pair and pointing pair wasn't quite clear to me at first. Eventually understood though that with the pointing pair the conclusion is based on the block while for the claiming pair it is based on rows/columns
ruclips.net/video/Y4sorf-uj8c/видео.html
i hate robotic voices and slides.
you just hate dishwashers
Me too 😭
Me too but the content on this video is perfect. I'm now solving diabolical puzzles
Chris Kibb k
@@Kevergy5 Thanks!
My brain feels like a chicken arm lifting a 90 pounds dumbbell
So after 5 years what does your brain feel like?
1:15 Naked Single
1:33 Hidden Single
1:55 Naked Pair
2:11 Pointing Pair (Triple)
2:30 Claiming Pair (Triple)
2:46 Naked Triple
3:04 X-Wing
3:23 Hidden Pair
3:41 Naked Quad
Thanks for the helpful strategies.
Thank you for watching and commenting. Much appreciated.
MackNNations How good are they i like them a bit because speak like robotic person Are TheyROBOTS?
Your information helps me in preparing my sudoku notes. Thk you.
I legit was flying through the comments section looking for a comment like this knowing it would be here somewhere. Thank you.
MackNNations....thanks for the "Table of Contents"
That was awesome. I had been using strategies 1 to 5 without even knowing they had a name. Those last 4 will come in handy!
Thank you so much for your comment. Regards,
omg me too!
Me too I thought I was the only one using them 😂😂
Yes me too
Same.
Thank you. This is a great summary of basic techniques for easy to medium puzzles and are the first ones to learn if you are just beginning Sudoku. These will help you solve all three New York Times Daily Sudoku puzzles, which are great puzzles to begin with. Mastering these first 9 techniques will also prepare you for more advanced techniques like Y-Wing, Skyscraper, Hidden Rectangle and Swordfish.
Thank you for your comment.
ruclips.net/video/Y4sorf-uj8c/видео.html
I do not think those techniques are for those who are solving easy or medium level players but also for hard and expert players as well
Tbh I didn't understand anything, I was solving sudoku by myself and it was peaceful until I came to watch this video and my brain died🙂
I'm pretty proud of myself right now... I was stuck on a particularly difficult puzzle and came here thinking that there were many other strategies that I hadn't even considered. It turns out, however, that I'd managed to reason out 8 of the 9 strategies. All but the X-Wing, which was actually in the process of forming in my head (I had used it a couple of times in a truncated manner, but hadn't actually spent any time reasoning it out) when I watched this vid.
I am proud of you too. Congrats!
ruclips.net/video/Y4sorf-uj8c/видео.html
I am learning these strategies one at a time and am already solving medium Sudoku puzzles easily. I use cross hatching and ghost numbers to fill in as many cells as possible and then start penciling in numbers block by block and eliminate as many candidates as possible after each block
Kenney - Thank you so much for your comment. You are a very smart man.
ruclips.net/video/Y4sorf-uj8c/видео.html
When I first solve a medium soduku puzzle, it took me more than a hour or two. Now I can solve it in 3 mins given a lucky puzzle and 7 mins on average. This is really helpful thank you
I'm glad my video helped. Thank you so much for your comment.
ruclips.net/video/Y4sorf-uj8c/видео.html
I didn’t know the name of the strategies I was using... Helpful video
Thank you for your comment.
ruclips.net/video/Y4sorf-uj8c/видео.html
Thank you for not making a slow unnecessarily long 30-minute video for each one of these.
Thanx.
Hate the robot voice, but the strategies are awesome!!
Joel Hershberger - Thank you very much for your comment.
@@RFC963 hombre espanol
These are all standard strategies. Nothing special is shown in the video.
@@Blubb5000 You are right, but for me at the time, I was just learning and had good info for me. We all start somewhere and this is one of the places that I was starting. It is special to people that are just learning. No need to downplay the content. It isn't special unless it is new material to someone. That is when it is special.
@@JoelHershberger Look for the channel 'Cracking The Cryptic'. It's a channel from two UK Sudoku masters. They are awesome (and real life humans in flesh and blood). I guess you will enjoy Simon's method to explain the strategies to solve all sorts of Sudoku puzzles. From super easy to OMG!
never knew that i was using all these tricks without even knowing what they are called. The more you practice the more intuitions you get which indirectly teaches you tricks like these. I can finally sleep in peace knowing that my practice wasnt a waste of time.
Lets take a moment and appreciate this guy who is still giving replies 👍🏼
love From India🥳
You are so kind. I'm very touched. I wish you the best. Thanks for the kind words!
I was using these techniques even before watching this video or any introduction. If you practice and think deeply you can understand most of them with the logic.
For expert level I think you need to practice at least 2 years to understand it well. 35 minutes is the average for me to do expert level and it's got better and better by time.
Thank you so much for sharing your opinion on sudoku. You may be interested in my other uploads.
Damn, the fact that you used these strategies before watching this vid, makes u very smart.
ruclips.net/video/Y4sorf-uj8c/видео.html
With no4, there is another triple in 2nd block 5,6,9 that repeat. How do know which the choose between 2,6,9 and 5,6,9?
Finally, I have learned sudoku with this beautiful video. Thank you.
2:18 example you have 2,6,9 on bottom two squares in the column, but you also have 5,6,9 in a row at the top. What made you choose the bottom 2 squares and not the top?
The two squares containing 5,6,9 at the top row do not meet the requirements of Pointing Pair. Thank you so much for watching and commenting.
but they have two 9's in a row exactly like the bottom, so what is the difference? I'm not understanding.
the upper middle block have three 9 (A5 A6 B5). but the lower middle block have only two 9 (H5 I5). So, the lower middle block's 9 have only two possibility, either it's H5 or I5, which is on the middle column (5th column). If you choose the upper middle block's 9 (A5 B5), the lower middle block will have no possibility of 9, which is against the rule.
Krista - Thank you so much for your comment.
Well it makes perfect sense now! Thank you. I really makes me wonder how I didn't understand that before now that I do. I appreciate the help.
I have been using almost all the strategies unconsciously in all of my games... Finally! Now I can understand it deeper because I know the name of that strategy...
Thank you for your interest in sudoku.
ruclips.net/video/Y4sorf-uj8c/видео.html
I learnt from this video.... Now able to solve in 30 to 40 minutes the expert levels... Most important I found the naked pair, x wing, the naked quad and the triplets....amazing
Thank you very much for your comment.
ruclips.net/video/Y4sorf-uj8c/видео.html
I’d like to try a naked triple sometime! 😏
you played pokemon
ur a virgin 4ever
😂
so would i but i don't have the juice for all that, a single empties my tank....just sayin'.
This made me laugh very hard
lol
At 2:58 for the naked tripple lesson you could also eliminate the 4s 6s and 8s from H5, G7, I7, and I8 since they are in the same row and block as the naked tripple.
The eliminated candidates must be in the same house as the naked tripple, which is in row H only. Thank you so much for your interest in Sudoku.
Its interesting to watch this, because I know after 12 years of playing this game, many different techniques, but I came here to learn new ones on the fly... and realized I already use them but never knew what they were called -_-
everyday you learn smthng new
Confused on #4 ( at 2:12 ). Aren't A5/B5 the same as H5/I5? Why do H5/I5 get preference? What am I missing?
A5/B5 are not the only cells containing a 9 in the block. H5/I5 are. Thank you for your interest in sudoku.
Hi I was want ing to solve hard puzzle ever since I can pass the medium for 2 years ago. The hard puzzle so hard to solve thanks for the video. Love it and very useful and it does work 😁😉
rock123y - Thank you for the comment.
In the "4. Pointing pair" exemple, the 9 from the middle-top block are eliminated because they are "pointed" by the 2 cells from the middle-bottom block. We could also have done the opposite and eliminate the 9 from the middle-bottom block. How do you chose in this case ?
The 9s in cells H5 and I5 in the middle-bottom block (Block VIII) are the only 9s in Block VIII, a requirement for a Pointing Pair. Being the only 9s in Block VIII, 9 has to be the solution to either H5 or I5. That means no 9 can appear in any other cells in Column 5 outside of Block VIII. But the pair of 9s in Block II are not the only 9s in Block II. They are not a Pointing Pair. Thank you for your interest in sudoku, and asking intelligent questions.
ruclips.net/video/Y4sorf-uj8c/видео.html
I've been playing sudoku for a bit and knew most of these but learned a couple of new tricks. Hopefully this will put me over the edge.
ruclips.net/video/Y4sorf-uj8c/видео.html
I'm making a program on R to solve sudokus. I thought I had it all figured out... Guess what I discovered something new here. Thanks a lot.
You may want to visit my channel where you will find more strategies explained. Thank you so such for your interest in sudoku.
@@RFC963 Thanks, I find this video already well explained. I put the x-wing technique in my program for now, I'm gonna see if it works.
@@RFC963 Thanks, I find this video already well explained. I put the x-wing technique in my program for now, I'm gonna see if it works.
@@eliebordron5599 There are many more powerful strategies this video has not discussed. They are X-Chain, XY-Chain, Swordfish, Finned X-wing, Skyscraper, 2-String Kite, XY-Wing, XYZ- Wing, and more. I wish you luck with your program.
@@RFC963 OH how wrong I was! Thanks, I will check these out for sure!!
The best tutorial! Examples make it easy to understand, well done!
Nice! I've looking for this exact video for hours now. I wanted techniques simply explained and could only find masters doing weird plays. Thanks!
Thank you so much for your comment.
I usually don't mark a column with the possible number combination but it seems like i will have to start doing it from now on !!!
LA times, AARP, NYTimes, etc. provide online sudoku designed to play with this technique. You can set the settings such that the marked candidates are managed for you. We make mistakes if we try to fill or erase the cells ourselves.
First time watching a sudoku tutorial video. Been doing Sudoku for months now and I was able to think up all these techniques on my own. The only exception maybe being the X-wing technique (although I vaguely recall using it a handful of times in the past, but I would just forget about it). I found that one interesting and will activly remember to use it in future. Thanks!
You are smart!!! You may like to know what other techniques you might have thought up on your own. Go to my channel and you will find techniques such as Swordfish, XY-wing, XY-Chain, BUG+1, Uniqueness, and more.
ruclips.net/video/Y4sorf-uj8c/видео.html
Very useful video. I have still problems with Z and Y technics. I know but cant understand. Yet this thecnics thought in the video eneugh to solve an extreme hard sudoku. Thanks. Will watch again...
Hello what is the difference between a pointing pair and a claiming pair?
At 2:38 why wouldn’t you circle the two you eliminated and eliminate the two you circled? I don’t understand the reasoning.
Hi great post, on slide 4 (pointing pair) you used 269 to eliminate the 9 in 569 (Row A&B) why not the other way around?
This was very helpful!
I’m a beginner, but I already know the first few strategies because it was easy logics to use and know solving the puzzle!
Thank you for watching and commenting.
ruclips.net/video/Y4sorf-uj8c/видео.html
0:42 List of strategies
1:16 Naked single
1:33 Hidden single
1:55 Naked pair
2:10 Pointing pair (triple)
2:29 Claiming pair (triple)
2:46 Naked triple
3:04 X-wing
3:22 Hidden pair
3:41 Naked quad
But how do u choose which candidate as indicator to eliminate other candidate under the same column if they have the same indicator as well?
Have you got a printable version of these nine strategies. Very helpful
Sorry, I don't have a printable version. Thank you so much for your interest in sudoku.
Incredible video. Exactly what i was looking for. Thanks
In the 7th example (x-wing) you can remove the 9 in I8 too and it's a very important removal
Good catch!
But it is not in the same column
ruclips.net/video/Y4sorf-uj8c/видео.html
very helpful video, big thanks.
Thank you for watching and commenting.
"Welcome to the Aperture Science Enrichment Center ...."
I have a question on technique #4. Does the rule apply to cell A5 & B5 and eliminate the 9's in cell H5 & I5?
Concise and clear strategies, examples were great too. Thanks.
Thank you for watching and commenting. Please visit my channel where you will find many more videos that may also be helpful.
ruclips.net/video/Y4sorf-uj8c/видео.html
at no. 5. hor do you know what row or column of 8s are you gonna pick?
You have to have at last one 8 in any row so if all your options are together in one block you can be sure one of those 8 in your row are correct so you can delete all 8 that are in block and outside of row because you know your 8 has to be places in row. So you are just looking for any set of numbers that are missing in row and only span one area.
wow! thank you!
I had managed to figure out all of them except naked triple and naked quad.
Imma try a sudoku i've been stuck on tomorrow to see if that was the missing key.
Thank you for watching and commenting.
Excellent explanations. First video I've seen that makes sense and is understandable. Thank you.
Thank you so much from the bottom of my heart for your comment. You made my day.
ruclips.net/video/Y4sorf-uj8c/видео.html
Okay, so, X-Wing (3:12) - if I have a 2 in row 1 column 1, r1c6, r9c1, and r9c6, (r1c7,8,9 and r9c7,8,9 do not have 2s) besides the 2s that make the X, all 2s in columns 1 and 6 can be eliminated?
Yes, thank you for your interest in sudoku.
Super explanation. Thanks
Thank you for watching and commenting.
Thanks very much to share these wonderful strategies. Very well.
Comment like this makes the effort making the video worth its while. Thank you so much.
there are many other strageies to solve sudoku puzzles. You have covered excellent strategies. Let's promote each other
Sudoku Guy - So nice of you to visit my channel. I am very honored. Thank you so much for the comment. You are right, there are many strategies to solve Sudoku puzzles as you have shown in your channel, which is nothing less than awesome. Congratulations!
@@RFC963 pls subscribe and promote my channel also..m a big follower of ur videos and passionate about sudoku ..plssssss 😊😊
Thank you!! Never knew X wing before.. this video is very precise and is exactly what I needed!!
Thank you so much for your comment. Much appreciated.
ruclips.net/video/Y4sorf-uj8c/видео.html
For the naked triple and naked quad examples, since they’re in a row, can I also eliminate the numbers that are the same as them in the blocks? Or I have to only do it to the pairs in whatever way they are (column, row, block)?
They have to be in the same house, be it row, column, or block. Thank you for your interest in sudoku.
@@RFC963 Ok thank you. Thanks for all your videos! They helped a lot! I’m able to finish all the Evil Level sudokus on websudoku.com now just with using 7 of the basic strategies!
@@travismanning9682 I'm so glad my videos helped. Congratulations, now you are an expert!
ruclips.net/video/Y4sorf-uj8c/видео.html
May I trouble you for the name or link for the Sudoku program that you use in your demonstrations. I like the ability of your program to use color and "strike through" options.
I just started playing this game and I'm getting better after every puzzle 😂
Congrats!
ruclips.net/video/Y4sorf-uj8c/видео.html
i went from being stuck to doing some fairly hard ones Thnx !
Thank you! Very helpful
For the Naked Triple 2:58, if box H6 contained 4, 6, and 8, would it still be considered a subset of the three candidates or no?
I may need some extra assistance for technique number 5. How do you know which numbers to single out? There was a column of three nines that could have been picked, as well. What is the deciding factor for which column/row gets picked?
Hmm, nevermind, I think I'm starting to get it. Those eights were the only instance of eights in that row, so they had to be the ones to get an eight. I'm putting this into practice to see if I can understand better.
Upon further inspection, I actually recently found this technique out on my own! I'm happy to find that after years of playing sudoku on and off, I know most of these tactics.
For #5. Claiming pair (triple) at 2:44, why can't the pair be vertical (A8 and B8)? (In this case it would be triple, with A8, B8, and C8). In other words, that would then make the pair or triple be vertical and then it would be the 8 in the bottom left corner of the block (C7) that is eliminated. Obviously, this seems to be the wrong thing, based on the solution of the puzzle that the video knows about, but as for working on it to get to the solution, it seems like this would be a valid conclusion at this time.
Per Shop - A8, B8, and C8 do not form a claiming triple of candidate 8 because there is an 8 in F8.
look at second block in row C. there is no candidate 8, which means the 8 has to be in block 3 in order to saticifie Row C (have all 9 numbers where it gets 8 from)
thus, 8 has to be in Cell C7 or C8. in both case, it will elimiated cell A8 B8 having 8
ruclips.net/video/Y4sorf-uj8c/видео.html
I use all of these, except the X-wing, which I'm sure will now come in very handy.
There is a tenth one I may have discovered and it involves none of those strategies. Basically it would mean that if you have a free number and can put it anywhere, essentially, but when placing it one of the numbers doesn’t move from a specific cell that is where that number belongs. I tried it when playing a very hard difficulty when determining the spot for the number 5 by using a 9 and 8. I found that if I flipped the order for the 9 and 8 the free 5 had one cell in which it never moved. Although, I could be wrong because I only did it once; it is what let me beat the game without any mistakes. I think it is possible to do if you don’t know any of these tips (which I didn’t) as it is a form of logic (if something doesn’t change position no matter how different the other outcomes are in the hypothetical scenarios then it must be the correct area).
It’s just a guess but I think I found it through stress and chance. 😅
Or I’m a complete idiot and got lucky. 😂
Congratulations, if you think you have discovered a new strategy although I don't follow your reasoning. You may be way over my head!
Thank uu so much because of this video i won sudoku hard level .. from the first time
Thank uuuu
Congratulations, Meriem talin!
At 2:27 during pointed pair (triple) how do you know to use the 9’s in cells H5 & I5 instead of the 9’s in A5 & B5?
The 9's in cells A5 & B5 do not form a pointing pair because they are not the only 9's in the block.
Which editing software you use
Thank you for your interest in Sudoku.
Thanks! Now able to solve hard puzzle in less time! Very much thanks!
Thank you very much for your interest and the comment.
Thanks for the video.
Thanks for watching.
@@RFC963 you are welcome ✌
This appears to be very basic information. Good help for beginners. I prefer to solve my Sudokus without writing in any numbers other than the solution. Learning to solve that way helps when playing online or using Sudoku machines. As I taught myself it was interesting to see the names you use for the various solving techniques. Thanks.
I neglected to say that I think your graphics are brilliant and explanations excellent. This video should be useful to a lot of people.
You must be a very smart man to have taught yourself to solve Sudokus. Thank you so much for watching the video and commenting on it.
Thank you so much for your kind words. Much appreciated.
I haven't got around to watching your next viseo yet. Something to look forward to. I have been solving sudokus for so long I don't remmber when I started. I bough puzzle books initially when I had some time in hospital. I'm a messy person which is a major reason not to write anything in but the solution. It can take longer the way I do it but that is not a worry. I do two daily sudoku, three on Sunday in the local papers, plus an excellent monthly produced by Lovatts in Australia. They alternate hard and quick issues and the had is overdue by two weeks now. I should ge a subscription. I do recommend weaning off writing in numbers as soon as possble. It is more challenging but also more satisfying. My wife, who is some years behind me in sudoku is doing pretty well that way. When I get around to the next video I'll give some more feedback.
yep ......... I also just listened to the names used for known techniques
Thanks a lot very informative
Glad it helped.
I see what is being shown now for #8...the naked pair is only found in the bottom block and the strategy works. I thought that the naked pair was being analyzed in the column, and of course that would not work. Thanks you for the good tip. Cheers
Thank you so much for your comment. Have a nice day.
Great strategies!
Thank you for watching and commenting.
When I stuck with the puzzle, I would take all my clothes off, which helped me solve the puzzle quicker.
I called the strategy "naked sudoku player."
at the pointing pair. 2:28. y do only the 9s from the last 8th block count ? y cant it be the 9s from the 2nd block ? thx
The pairs of 9s in the example are the only pair of 9s that lined up in column 5 in block 8. There are three 9s in block 2, and the 9s don't line up in a row or a column. Therefore the rules of pointing triple don't apply. I must again emphasize the importance of understanding the underlying logic of each strategy by checking out my other uploads in my channel. Thanks for you interest in sudoku.
Can somebody clarify the pointed pair 2:19 ? What if the candidate appears in three cells in the same block and row/column? Does the candidate outside of the block (same row/column) become eliminated?
Yes, that is called pointing triple. Thanks for watching and commenting.
#7-didn’t know that one. Knew the others but have not been familiar with terminology, so nice to know
Thanks, have a nice day!
ruclips.net/video/Y4sorf-uj8c/видео.html
At 3:03, why didn’t the 8 in g7, 8 and 6 in i7, and 4 and 6 in i8 not get deleted? Is it because the naked triple wasn’t all in the same block?
The naked triple (4,6,8) under consideration is in row H. Only the other appearances of 4, 6, and 8 in row H can be eliminated. Thank you for your interest in sudoku.
Does the pointing pair (triple) have to be on the outside perimeters?
No, just in the same row or column within the same block
I've been trying to learn more advanced techniques in sudoku and struggle to utilize them. Would I be able to send someone a pic of the puzzle I need help with and the person be able to explain how get to the next step?
Please go to my channel. You will find easier examples. That might help.
This is actually very good despite robot voices. I would like to see more strategies if possible. Increasing the speed of the voices does make them more bearable.
do you habla espanol?
@@water2986 All I know how to say in Spanish is "No hablo espanol." BTW how do they get that funny little thing over the letter "n?"
@@frank124c thats what we call 'de la eñe'
~ this ~ ~ ~ ~ ~
No, I don't speak Spanish.
@@RFC963 Everyone should just speak English.
In the painting pair example, why to eliminate the candidates in the first block but not in the second one? 🤔
What do you after you've done all the techniques and there are boxes with only 2/3 numbers in them? (when you can't eliminate any more but there are still pairs/3's left)
Oh it means there's still a hidden pair somewhere if anyone wants to know
Simran Murti - There are more techniques than these nine. See my other uploads.
@@RFC963 Thanks I will C:
Great video! Explains everything so clearly, was really helpful.
Comments like yours make my effort to make the videos worth its while. Thank you so much. You made my day.
RFC963
Just keep doing what you're doing. A lot of people tend not to write properly on videos, so synthesized voice or not, the way you wrote it was crystalline. I cannot express how nice it was for me to find a video that was explained with such clarity...
yas sy - So nice of you to say that. I appreciate it very much. Thanks!!!
ruclips.net/video/Y4sorf-uj8c/видео.html
Get a mic, dude.
Thank you for your comment.
RFC963 I didn't want to be rude, it's just that the robot voice is annoying, sorry. 😕 If you talked while showing the stuff you're talking about, not the whole text, it would definitely be a better quality video. Also it would be more personal.
I did not find you rude. I appreciate your comment. I found it somewhat humorous. I understand robotic voices can be annoying to many. I made some changes in my later uploads. If you would, please check out my recent upload : "Next Nine Sudoku Strategies Beyond The Top Nine Most Often Used". Thanks, and have a nice day.
@@RFC963 I thought the guy sounded fine but the woman sounded robotic
@@macforme Thank you for your comment.
Nr 5 is the one I don't get because there's another claiming pair in the same box right ?
Kinda hoped the infamously difficult-to-spot Empty Rectangle might have been discussed here... :-(
Tricks adequately explained, still let me add some info to three of them to make them 100% true:
2:25 Could also be true for the Pointing Pair of 9s up in the same column!
2:40 Only true because Row C doesn't leave room for an 8 to fit elsewhere. If it did, there's also a Claiming Triple of 8s true for the same block (in column 8).
3:35 If indeed they are in the same column or row, these candidates appearing in other cells than the Hidden Pair, may (must) also be eliminated!
PS and then there are, of course, the three variants to the X-wing: namely the Y-wing, the Skyscraper and, dare I say it, the Swordfish :-)
2:25 The bottom pair 9 is the only 9's in the block. Not so for the top pair 9.
PS You may want to check out my other uploads if you want to know about XY-wing, Skyscraper, Swordfish, and others, such as XYZ-wing, X-chain, XY-chain, BUG+1..........
ruclips.net/video/Y4sorf-uj8c/видео.html
@@RFC963 there are two pointing pairs in #4, doesn't make any sense, sorry.
can someone explain why they chose 3 and 8 at 3:38 ?why not others ?
also can anyone explain 3:51 too? i didnt get that
i somehow stumbled on this interesting video while looking at making home-made pasta. Damned if i can figure how it popped up. It adds some useful rigor to intuitive techniques that I have been using. I am curious if anyone has seen anything about or themselves used a technique I discovered that is a variation of their #9, where we use the assumption that every puzzle has a unique solution (which i think is solid, since the puzzle makers cannot practically offer multiple solutions), use this assumption to eliminate unique pairs in the corners of an "X" as they show it in #9. i.e., if you have a unique pair (no other candidates but those two) on one "leg" of their"X" (i.e., same row/column within same box), and that same pair appears in the opposite leg in the other box, then that second leg's pair must include other candidates, (otherwise if there were no other candidates in that second "leg" but that same pair, then that pair of candidates could could be used interchangeably in both both legs, and there would be NO UNIQUE solution to the puzzle. Therefore, since there MUST be a unique solution, one of the two legs MUST have one (or more) candidates in addition to the unique pair. Put another way, a unique pair in the same row/column of a box will not permit that same unique pair to exist in the corresponding corners of an "X" formed in another box. Has anyone run across this?
Wow, you are a very smart man! What you have described is a strategy known as Unique Rectangle, UR for short. It is a very advanced technique. There are several variations under this title. I shall upload videos on UR in the future. Thank you so much for you comment.
Dont know about smart, but i do enjoy logic. I actually came to this UR thing because i was trying to figure out if there is a system of linear algebraic equations, put into a matrix, that would describe any given puzzle. That is, we are solving N equations in M unknowns, where N is greater than M, which implies redundant solutions, otherwise, if they were equal, then their would be one unique solution, but it would take a computer (or a handy matrix, but I never got that far) to solve in a reasonable amount of time. The greater N, the more redundancies, the easier the puzzle. In the process I began to play with how to create not solve them. I noticed that for any solved puzzle, you could transpose any pair or any three rows or columns 1-3, 4-6, 7-9 and generate a new (different) solved puzzle. Kind of like if you shuffled, within the "boxes", row or columns. So I am thinking that this would be a great bar bet, how fast could you create a puzzle, (would have to be a certain kind of bar i guess) Thats when i realized the requirement for unique rectangles. Then i tried to figure out what is the fewest number of clues you could provide (known cells) and still create a solvable puzzle? i ran across one that offered only 22, and that took me almost an hour to solve! Most of the others rated as difficult I have seen offer 24 or 25. I understand that this must be a function of which cells you choose to offer as known, and that at least one be redundant, and the fewer redundant you offer, the fewer you will need to offer in order to solve. Conversely, the more non-redundant cells your offer, the easier the puzzle. Intuitively, I can see that the absolute fewest number of known cells you must offer is going to be somewhere between 10 and 18, and I am guessing closer to 18. And virtually every puzzle i have seen has clues offered in cells that are symmetric about the upper left/lower right diagonal axis. So this tells me that there is a clear logic to which cells are offered as clues, and that all puzzle makers probably use the same algorithm for making their puzzles. I was starting to get pretty adept at solving, and times were coming down, and oddly, i was solving the harder levels faster than some of the easier ones. The UR was really accelerating the solutions. So I am liking it and thinking, i wonder if i could compete? I go online, and I do some "evil" rated puzzles and my times are around 20 minutes, and I see that the average, for "evil" is 7 minutes. What? if the typical puzzle has 25 knowns, then it has 56 unknowns, and that means you are entering cells at the rate of one every 7.5 seconds ON AVERAGE! I tried to game it by writing down the puzzle on a separate sheet, hitting pause, solving off-line, and reopening the puzzle just to transcribe the answer. Granted my ipad app is slow and hangs up, but it still took 3 minutes, leaving four minutes to solve. I don't buy it. Either they are gaming the system, or these are just savants. But that is the AVERAGE---how many savants can there be? Or, somebody developed the matrix i was working on. Is that out there on another You-tube? Just wondering
+reconllc I have dubbed this one the unique solution rule and find it a useful thing to remember also for other Sudoku style problems. It doesn't necessarily work for coloured Sudokus as the numbers CAN be in same positions if they are different colours.
ruclips.net/video/Y4sorf-uj8c/видео.html
Thank you. I did not understand the pointing pairs...and why it was also called triples, and why Block 2 was not kept instead of block 8 ? Actually there were so many 6 and 9s in every cell in this Sudoku puzzle that I am confused why that particular was chosen among them all?
ruclips.net/video/Y4sorf-uj8c/видео.html
Thanks for the hidden pair
Thank you for your interest in sudoku.
That will take a year of practicing until i learn all of these strategies! Nice video!
ruclips.net/video/Y4sorf-uj8c/видео.html
At 3:09, the X-wing, you know more than presented here! You also know that a 9 must be in column 8, that is D8, E8, or F8. In this case it's obviously E8 because D8 and F8 already have values.
ruclips.net/video/Y4sorf-uj8c/видео.html