Sudoku. Tutorial #23 Hidden Matching pairs and other techniques.

#sudokuguy @sudoku
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Whe you reached the difficult puzzles you may find it necessary to add many more small possible numbers for each cell. Some computer prgrams put all these in for you. It saves time but one of the skills is putting in the correct possible numbers. Spotting hidden pairs within a puzzle can appear once you know how to eliminate other numbers in a particular cell or cells. This sceanario shows this feature.
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Thought for th day.. "Worry is like a rocking chair. It gives you something to do, but doesn't get you anywhere."

[@Buttersausage]

I just started yesterday and I’m now able to complete a full puzzle non/stop my timing is improving as well thank you!!

[@SudokuGuy]

That's fantastic Exclesius. Have fun as you contiue onto harder puzzles. Please encourage others to subscribe. It's free.!

[@IntikhabAlamOfficial_97]

Same...

[@CrystalCammarota]

Loved this I come across this situation alot! Thanks for sharing as always!

[@SudokuGuy]

The key is to remember to look for these.

[@IselaOz12]

Thank you 😊 your video helped me a lot! 👌🏽

[@SudokuGuy]

Thank you. There are more tutorials coming. Hope you enjoy the step-by-step lessons. 1-25 Have fun.

[@prabhakararaoirukuvajjala3380]

I am a learner. I found your explaining fantastic. Thank You very much Sir

[@SudokuGuy]

Thank you. Enjoy ...proatice and watch the videos and you will succeed. don't try the very difficult puzzles until you have mastered the medium puzzles....just a suggestion

[@JBMindset]

I just watched your first 12 video's for beginners. As I just started doing puzzles. They were immensely helpful. Thankyou!

[@SudokuGuy]

Thanks. Master the easier puzzles first. You can do it! Have fun!

[@knidup]

my goodness you have helped me so much thank you sudoku guy

[@SudokuGuy]

Thanx There is more coming. kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w

[@jaypeedeguzman8088]

You helped me a lot and thank you for all of your lessons it's great

[@SudokuGuy]

Spotting hidden matching pairs take practice, but after learning what to watch for it becomes easier. If poosible use 2 little numbers only in a cell until you get really stuck. It's easier to spot hidden patterns with fewer little numbers in a cell.

[@christonyawatson4519]

you are the best explainer ive found so far

[@SudokuGuy]

Thanks Have fun

[@gabyq4097]

thanks for the explanation !!! me and my boyfriend do sudoku puzzles together after stressful times in college :’) but we didn’t explain after looking it up; your videos have helped me immensely! thank you

[@SudokuGuy]

My pleasure. So glad you found my site."the most popular site online to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. Have fun as you learn step by step how to solve. For a list of videos go here: kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w sudokuguy.com

[@ShoroukA]

Thank you! 💐 I have a question: 8:45 The 2&4 in the middle would they be considered as a matching pair (therefore eliminate the 1)? or do they have to be in the same row?

[@SudokuGuy]

Thank you Shorouk. If I understand you correctly the 2,4 in row 2 is a matching pair, but what happens in row 1 depends on what numbers are in the columns below. Therefore I can't say anything about the #1. Hope this helps.

[@ShoroukA]

It does help! Thank you 😃

[@fernandoricagno]

@@SudokuGuyR1C6 and R2C1 are matching pairs ????? Are you saying that we could eliminate the 1 that is in R1 C6 ?? in this case R1C4 will be a 1. Is this correct ? Or we should consider it as a 3x3 , leaving them as they are ? Thanks

[@lathamurali5897]

Thanks a lot for teaching so many useful techniques sir, I just have one doubt, how can we assume that 7 will come in the bottom row and start elimination of other numbers, kindly explain,,

[@SudokuGuy]

Good question. This is not a real puzzle but a demonstration of a technique. The 7 is put there just to show the technique. Hope this helps So glad you found my site."the most popular site on line to learn sudoku" Please tell others, subscribe and click the bell by the subscribe button. Have fun as you learn step by step how to solve. You can view all of my videos here: kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w

[@narayansarkar7409]

Thanks sir

[@SudokuGuy]

MY Pleasure. You will find many tricks and tecniques by looking at the tutorials from #23 onwards. Please share with others. Have fun.

[@sissi1366]

Thanks for your tutorials. I have an answer: if in the same row for example I have two squares, one with 7,8,9 as possible candidates, and the other with 7,8 as possible candidates, Is (7,8) an hidden pair? Can I eliminate 9? Thank you

[@SudokuGuy]

Sorry no.It is not a hidden pair. It depends on other factors in the row vol or block. So glad you found my site."the most popular site on line to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. (It’s FREE) Have fun as you learn step by step how to solve. Below is my home page with all the videos listed. kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w

[@andTutin]

explain chain strategies please

[@SudokuGuy]

Coming in a tutorial soon.

[@KarlaSanchez-pl5ss]

Handy the 3 just turned up.

[@SudokuGuy]

Thanks for your support. So glad you found my site."the most popular site online to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. Have fun as you learn step by step how to solve. For a list of videos go here: kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w sudokuguy.com

[@s.m8503]

Hi sir, I have a doubt, when we use those tricks, will the answer be correct as it is given in the solution?

[@SudokuGuy]

Yes, definitely So glad you found my site."the most popular site online to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. Have fun as you learn step by step how to solve.You will find all my videos here kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w kzbin.info

[@winniehaha5755]

Hi Robin, Love your videos and explanations! I understand why you underline your matching pairs but at 5:04 I was not able to figure out why you underlined the 1,4 in the top left corner of the top middle block. I don't see the other half of a 1,4 matching pair at that point. Thanks again for all you do!

[@SudokuGuy]

Thanks for your comment. You don't have to underline the 4/1. I do this t let me know that only 4 or a 1 can go there. Once you are very experienced this is not needed at all.

[@ggressell4011]

I have been following you and enjoy but in this one, you start introducing numbers and not sticking with what you started with. If it was a dead-end, it would be nice to know. Or how to solve it as is.

[@SudokuGuy]

It was a demonstration only for showing tricks and techniques.

[@frankmoyer5822]

I may be dense, but how can you randomly assign the outside 3 or the 7, "for the sake of argument"?

[@SudokuGuy]

This is not a real puzzle but a section of a puzzle. I deliberately put the 3 and 7 there to show what will happen if they were to appear later in a puzzle.I hope this helps Frank.

[@frankmoyer5822]

My problem is in recognizing the triples.

[@SudokuGuy]

hang in there Frank With practice you will get better.

[@frankmoyer5822]

@@SudokuGuy the triples finally became clear to me.

[@fahadalanizi251]

👍

[@SudokuGuy]

So glad you found my site."the most popular site on line to learn sudoku" Please tell others and subscribe and click the bell by the subscribe button. Have fun as you learn step by step how to solve. You can view all of my videos here: kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w

[@mindjob]

I’m looking for techniques where I don’t have to write so many small numbers in blocks.

[@SudokuGuy]

I don't know how far you have got re looking at my videos. If you use the Snyder notation (see lesson 4) you will not need to put all possible numbers in the cells. As you reach the very hard puzzles then you may have to put all the numbers in. See my latest tutorials. So glad you found my site."the most popular site online to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. Have fun as you learn step by step how to solve.You will find all my videos here kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w kzbin.info

[@33alejan]

How did u find 3????

[@SudokuGuy]

I am assuming you mean the 3 under the 8 in block 4. If this is the case I say "lets say a 3 came up" ie I made it up just to show you the ramfications of a 3 turning up there. Hope this helps.

[@33alejan]

@@SudokuGuy Yes Sir, thanks for your kind reply and for the videos...I am a new member of you :)

[@anishmalhotra8133]

But i don't understand the why? What is the mathematical logic behind it

[@SudokuGuy]

Hidden matching pairs enable you to remove other small numbers.Matching pairs are very important when solving. as if you solve one number then you have another solved. for more information about matching pairs go to tutorial #88 . Robin I also suggest you watch the video again

[@PeterCurrie]

1:12 "Along the second row, there's only one 6" Why can't 6 go in column 4?

[@Kluivertnr1]

Peter Currie Indeed. Also my question!

[@SudokuGuy]

@@Kluivertnr1 Because there is no 6 in the bottom row block 3

[@Kluivertnr1]

Sudoku Guy Thanks a lot for the fast answer!

[@PeterCurrie]

@@SudokuGuy Do you mean "block 3" as in the leftmost 3x3 square? Or the third column from the right? I don't understand why 6 is not a candidate in row 2, 4th box from the left.

[@dselvy]

@@SudokuGuy why not?

[@MrSirchasen]

How did you just put a 3 somewhere and solve the whole puzzle? Why the 3?

[@SudokuGuy]

This is not a real full puzzle but a scenario. I put the 3 there just to show what would happen. So glad you found my site."the most popular site online to learn sudoku" Please share with others, give me a thumbs up below the video, and subscribe and click the bell by the subscribe button. By doing so you will be notified by youtube when I upload a new video. (It’s FREE) Have fun as you learn step by step how to solve. Below is my home page with all the videos listed. kzbin.info website www.sudokuguy.com

[@appuboss5364]

U taught me better than my wife

[@SudokuGuy]

Now that's a neat comment. So glad you found my site. "The most popular site online to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. (It's FREE) Have fun as you learn step by step how to solve. Below is my home page with all the videos listed. kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w kzbin.info www.sudokuguy.com

[@gyes99]

I enjoy your lessons on sudokus, but here I already fail to understand the very first step, the place of the 6 as a single. What excludes a possible 6 candidate in the left middle row of the second block, the one that has 1-2-3-4 candidates in it? If there was an imaginary 6 in the left column of the middle block elsewhere (not shown in this example) then there should not be a 6 in the lower left row of the middle block either. The only thing you know for sure, there is no 6 in the top row. All other empty cells in the middle and right block are potential candidates for a 6 as well.

[@SudokuGuy]

The 6 in the middle of block 3 is the ONLY place for a 6 to go in that row. ie row 2, therefore due to the 6 in the top row of block 1 and using TMB (lesson1) there are 6's in block 2 row 3. Hope this helps. This tutorial is for advanced players. www.sudokuguy.com to see all lessons and tutorials.

[@conservativetothecor]

I couldnt even figure out the concept, even though I wanted to learn this for quite some time. However, Not one of the pages of those little books of puzzles you buy look like your puzzles. They say easy and have only 3 or 4 numbers in each block and they are so hard to even connect one number. Geesh....getting frustrated already here. I restarted more then a dozen puzzles yesterday and got blocked. I finished one though....1!!!! lol

[@SudokuGuy]

May be you should go back and master the easy ones first. Also I suggest you buy another book. What you are telling me above is that the book of puzzles is full of very hard puzzles. Thow it out and buy a book of easy/medium puzzles by Will Schortz. I have found his books much more accurate in terms of diffculty. You will find all the techniques for easy/Medium puzzles by looking at lessons and tutorial 1-12 So glad you found my site."the most popular site on line to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. Have fun as you learn step by step how to solve. kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w

[@conservativetothecor]

@@SudokuGuy I bought 4 or 5 books. That one labled easy was a nightmare. But then I picked up the one labeled hard...and guess what....they were pretty easy. lol. Im thinking Im gonna go back and make a little notebook full of hints. Thank you. I knew I would enjoy it.

[@learessler6435]

the written explanation appears all over the puzle preventing one from seeing the explanation! HELP !!0

[@SudokuGuy]

sorry

[@rontuck2568]

Rule of exclusion?

[@SudokuGuy]

Hello Ron not sure what you mean? So glad you found my site."the most popular site online to learn sudoku" Please tell others, subscribe and click the bell by the subscribe button. Have fun as you learn step by step how to solve.. Have fun as you learn step by step how to solve. You can view all of my videos here: kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w sudokuguy.com

[@davidhall8874]

Now solve it without your "Let's just say for the sake of argument!" I have a puzzle that is rendered down to the point that there are no "hidden pairs" and appears to be unsolvable without guessing.

[@SudokuGuy]

Hello David. I don't know how many videos you have reached watching, but I suggest you continue watching the videos because by doing so you will find the answers you are looking for. hang in there.The more you know what to look for and the more techniques you know the easier it is to solve. for a list of my videos go to ... kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w

[@SudokuGuy]

Also sorry to tell you this but you should never guess (see lesson 4)

[@aneesputhiyaveettil9974]

Hi

[@SudokuGuy]

So glad you found my site."the most popular site on line to learn sudoku" Please share with others, subscribe and click the bell by the subscribe button. (It’s FREE) Have fun as you learn step by step how to solve. Below is my home page with all the videos listed. kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w

[@howardtoob]

"for arguments sake"??? How does this help? Very frustrating when you solve using "for arguments sake". It doesn't help IMO.

[@SudokuGuy]

Please understand I'm purely demonstration a scenario.

[@ozlemkoc4960]

After each time he said "for arguments sake", I found out something new and learned more about Sudoku. He's doing it so we learn. Also, "for arguments sake" is actually a saying and he uses it correctly. I wouldn't even write a comment on this but you sound really ungrateful IMO......

[@babij-jn8qg]

dont go argument sake 7 , show how .

[@SudokuGuy]

Please understand I'm purely demonstration a scenario.

[@pcfitter5327]

for argumentative sake, the 7 you put in the middle bottom row could have been in any of the three as shown. you must have known it went there to solve the puzzle. what do we do in real life when stuck at that point??

[@georgehurst4344]

PCfitter you would’ve probably found that that 7 had to be true due to the blocks below.

[@ananthulaharikishanrao5502]

PCfitter On

[@SudokuGuy]

This is not a real puzzle but a demonstration of a technique.

[@jimwusm]

3:40 top middle block there are two 4s. Rule of exclusion may take out 4 on the top block and leave 2 for that cell. Great tutorial!

[@SudokuGuy]

There is another 4 in that block on the second row, therefore the rule of exclusion cannot be used.