Tutorial #71 Sudoku. The Empty Rectangle Part 1

[@nothingnothing3211]

This guy is so generous and always happy. I thought of him being a Canadian just after watching his one video and guess what? it proved to be right.

[@SudokuGuy]

Actually I am Canadian and Australian. Living now in Adelaide South Australia. So glad you found my site. “the most popular site online to learn sudoku” Please share with others, subscribe (FREE) and click the bell by the subscribe button. Have fun as you learn step by step to solve. You will find all of my videos below. sudokuguy.com kzbin.info

[@matthewandrews2267]

This was so helpful, thank you. Every explanation of empty rectangle I’ve seen has explained the logic of why, once you’ve found the pattern, you can eliminate a candidate, but you’re the first I’ve found to explain what to look for to actually identify them.

[@SudokuGuy]

Gee thanks for your comment. All the best as you learn more by watching my videos. 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

[@sreedharrangachari3923]

I have started doing sudoku three months back . I have seen almost all the tutorials upto 30 . I am able to do the hard and master puzzles in my iPad using the techniques you have taught . Magic pairs , three in a row , xyz pivot etc . Thanks a lot . You are a super teacher of Sudoku . God bless you 🙏

[@SudokuGuy]

Keep it up. 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. 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/door/d8JaOdfEWcJOtwG6YayW0w kzbin.info www.sudokuguy.com

[@rg2505]

Your explanation and techniques have helped me learn sudoku from basic to "quite advanced" stage and am still watching, learning and practicing. After watching both parts of video for Empty Rectangle, I have a suggestion- instead of bringing in various shapes we can simply say that if a small number comes in only one row AND one column in a block- this covers all your shapes and with this look out in explanation, both parts may get condensed in one video and I feel much easier to look for. Thanks, Rajeev from Mumbai.

[@SudokuGuy]

Thanks for your feedback r g

[@georgyevans]

This is such a clear and elegant explanation. Thank you!

[@SudokuGuy]

You're very welcome! 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 sudokuguy.com

[@Stackz401]

When I am stuck on a sudoku technique you are one of the people I look to explain it. Very through and easy to understand!

[@SudokuGuy]

Gee! thanx campevergreen777! 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

[@8MollyGlen6]

Thank you for being yourself! Thanks to you, Iearned so much about solving sudoku puzzle 🤗😊 I actually watching all your videos! Your instructions are clear and funny 🤗😍Merry Christmas and Happy New Year 2023! All my best wishes to your family and you🎉🎊🎁🤗🌼🌺🥂🍾

[@SudokuGuy]

Awesome! Thank you! Have a super 2023

[@KitchensbySavina]

Another great and well explained lesson. Thank you.

[@SudokuGuy]

Thanks again! the next tutorial Part 2 gives you more info on the empty rectangle. [e-mail] .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 kzbin.info www.sudokuguy.com

[@gikar1948]

Thank you for making your Sudoku lessons informative and entertaining.

[@SudokuGuy]

More to come! it takes practice to spot these. 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. 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/door/d8JaOdfEWcJOtwG6YayW0w kzbin.info www.sudokuguy.com

[@Knittyneeds]

@@SudokuGuyGreetings from France. A big hug to the most exceptional Sudoku Gentleman on KZbin 🤗. I love You, your Sweetheart and your Twin. An amazing TRIO. 🥰🥰🥰🌹🌹🌹 HAPPY VALENTINE'S DAY in advance 💞❤️🥰🌹 to the TRIO.

[@mariahkariman3461]

Am very excited for the premier Just counting the days to see more new techniques from you.

[@SudokuGuy]

Hope you enjoy! Mariah

[@jackjohnson756]

Love this guy, he deserves more subs.

[@SudokuGuy]

Thanks That would be great. My site is free.

[@mrsulaman9901]

The two numbers in the conjugate pair form one side of the rectangle (the two 5's in the top row of the image shown before you start playing this video). One of the numbers in the "SHAPE" is the third corner of the rectangle (the 5 in the top row of the middle square in the image referred to above). The number that forms the 4th corner of the rectangle can be eliminated (the 5 in the red square in the image shown before you play this video). Thus only 3 of the 4 corners of the rectangle remain. Hence the 'empty rectangle'.

[@SudokuGuy]

Thank you for your comment.

[@dioune32]

Thank you, I've read 3 different written tutorials and still couldn't understand how to recognize or apply this, and partly due to the "empty rectangle" name. Now that I've watched your video I immediately applied it twice on a puzzle I was solving! You made it very simple to understand!

[@SudokuGuy]

Glad it helped!. kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w sudokuguy.com

[@unechan_b2549]

This is a beautiful tutorial for this advanced technique, which I was struggling to master. As a non-native english speaker, the terminology “empty rectangle” sounds pretty queer, but after this tutorial I’m remembering this as “LlTt+” (big & small L, big & small t, and a plus”) and ... oh now I’m spotting them so clearly. Thanks again and pls keep posting your fantastic tutorials !

[@SudokuGuy]

Hi Unechab_b You have made me happy. Thanks for your support. So glad you found my site. “the most popular site online to learn sudoku” Please share with others, subscribe (FREE) and click the bell by the subscribe button. Have fun as you learn step by step to solve. You will find all of my videos below. sudokuguy.com kzbin.info

[@davesanders9203]

It must be illegal for someone to have this much fun!!!

[@SudokuGuy]

Gee thanks Dave. I am addicted can you tell!!!!!! 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. 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/door/d8JaOdfEWcJOtwG6YayW0w kzbin.info www.sudokuguy.com

[@gabi.genova]

Amazing !!!! Thank you for your tutorual, ive been stuck on The empty rectangle for so many years , could never solve the advanced puzzles and now I think I get it !! Going to try it out now :) Thank youuuuu for your clear explanation 😊

[@SudokuGuy]

You have made my day. Thanx gabi. 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

[@medawson01]

Thank you for the tutorial.

[@SudokuGuy]

Glad it was helpful Marguerite

[@krishnanr.5677]

Nice logic. thanks very much. Looking forward to the next continuing tutorial .

[@SudokuGuy]

More to come! thanks.

[@mouradtarzalt]

Empty rectangle. Cells outside the shape form a rectangle Empty of candidates considered in the shape. Nbre of shapes is 33. Sudoku Swami Tutorial 17 (71 for Sudoku Guy). Thanks Sudoku Guy for the lesson

[@SudokuGuy]

Thanks for sharing. You are right.

[@peterkemp4372]

Great, many thanks. Look forward to part 2. All the best from sunny Bahamas😎😎😎🍷🍷

[@SudokuGuy]

Same to you Peter. Lots to learn and watch for eh!. 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 kzbin.info www.sudokuguy.com

[@mikemiles3068]

Always great videos and tips‼️👍 Thank You👍✅

[@SudokuGuy]

My pleasure! 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 kzbin.info www.sudokuguy.com

[@lilithzeppeli3373]

Thank you so much. I loved the explanation

[@SudokuGuy]

You are welcome! Lots to learn. thanks for watching. Robin

[@nikunjthakur710]

You have made it so simple to understand... waiting for the next tutorial!!

[@SudokuGuy]

Glad to hear that! it will be around jan 21st and I will annoubce it on the community tab on my channel page. 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. 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/door/d8JaOdfEWcJOtwG6YayW0w kzbin.info www.sudokuguy.com

[@safiyyahimran6958]

Thank you for the tutorial..Can you explain how exactly to spot the Z. Should it be in line with the Y of the conjugate pair or should it be in line with the other end of the shape ie the T. Or should it always be in line with both?

[@SudokuGuy]

I 'm sorry i do not know what you mean by the Z

[@seemashrivastava1661]

Thank you Sir for explaining so well. I have one doubt, is it necessary that conjugate pair should be in different block?

[@SudokuGuy]

Not at all 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

[@Daps24]

No, conjugate pairs can be in the same row, column or block.😊

[@arimyllyniemi8445]

I am again so grateful that Your health lets You to give us valuable lessons of sudoku in Your own, humorous style. Please, keep on doing them. I have watced them all. ... and these greetings come from the finnish jury ;)

[@SudokuGuy]

Wonderful Ari. Thanks. there is lots to learn. eh! hang in there.

[@themathsdean1801]

Very well presented 👍

[@SudokuGuy]

Glad you liked it So glad you found my site. “the most popular site online to learn sudoku” Please share with others, subscribe (FREE) and click the bell by the subscribe button. Have fun as you learn step by step to solve. You will find all of my videos below. sudokuguy.com kzbin.info

[@terrybolerjack197]

As always you made a complicated situation become an easy solution!

[@SudokuGuy]

Glad you think so! Please give me a thumbs up below the video if you liked it. kzbin.info

[@leezpoco]

Dear Sir, Suppose, Top Left Three cells 1,2,3 ( vertically) it means it can be Middle Centre/ Right or Bottom Centre/Right. Would you like to explain some setup or system or techniques if Three Numbers place in Vertically or Horizontally. Thanks.

[@SudokuGuy]

I strongly suggest you go here kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w This where you will find a list of all of my videos Lesson 1 and lesson 2 show and explain TMB Top Middle Bottom rows in horizontal blocks and LCR Left Centre Right in columns of veritcal blocks. This is referenced throughout my site on youtube. With over 15 million views it has helped thousands of players to solve sudoku step by step.

[@leezpoco]

@@SudokuGuy Thanks Sir.

[@maccadamn]

You confused me with the positions between 6:22 and 6:28. Why are you emphasising a difference between them?

[@SudokuGuy]

Good point. it was not needed you are right. Thanks for pointing this out.

[@thomaswilke6312]

Very informative! I hope I get to try it out soon

[@SudokuGuy]

Please do! It takes practice to spot these but very satisfying when you do find them.

[@davidwalters313]

Very helpful and enjoyable. Thanks

[@SudokuGuy]

Glad it was helpful! 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. 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/door/d8JaOdfEWcJOtwG6YayW0w kzbin.info www.sudokuguy.com

[@theapan4889]

question for the community from a beginner: how do you tell which "arm" is the legit direction? E.g., in the "T" shaped 5's example, you could argue that the eliminated 5 was actually X (while Y remains Y), and that would run you into problems. Does it have to extend only on top of the T and not the side? What about other shapes in the Empty Rectangle situation? Slightly unsure how to identify the right conjugate pair vs. X. Thank you in advance!

[@SudokuGuy]

Thanks for your question If you are looking at Tutorial #71 it means that you have learnt all of the steps I cover from tutorial 1 to tutorial 71 If you haven't then you can easily become frustrated. I suggest going here. kzbin.info/door/d8JaOdfEWcJOtwG6YayW0w

[@tapankumarnaskar9884]

Nice and helpful too

[@SudokuGuy]

Thanks a lot. Lots to learn Tapan. More coming. 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 kzbin.info www.sudokuguy.com

[@jamesobedoza6443]

In your example, what if the Y and Z are also conjugate pairs so that Z can now be X, and Z be X? The Z certainly has to be eliminated? Please advise. Thanks

[@SudokuGuy]

Yes it can be.

[@lindagates9150]

I agree with Marguerite,Mariah,Mc Muragan and Ayesha are saying thank you 👍🥇👍

[@SudokuGuy]

Hi Linda, Gee thanks. Lots more coming. 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 kzbin.info www.sudokuguy.com

[@CharLInd12]

In this example, the Z could also be an X, right? Or am I seeing it wrong?

[@SudokuGuy]

You are seeing it right.

[@ayeshaakram2263]

All the best sir

[@SudokuGuy]

Thanks. I hope you will be able to sit in and have a chat with me. It is very hard to know the best time of the day to offer a premier. What is good good for one part of the world is not good for another part of the world.

[@shehum]

@@SudokuGuy Very true. Time differences all over the world. From Nigeria here, Sudoku Guy.

[@tammyton]

Ah, this finally makes sense! Thanks for the video :D

[@SudokuGuy]

Glad it helped! So glad you found my site. “the most popular site online to learn sudoku” Please share with others, subscribe (FREE) and click the bell by the subscribe button. Have fun as you learn step by step to solve. You will find all of my videos below. sudokuguy.com kzbin.info

[@foli...]

Thank you very much, it helped me.

[@SudokuGuy]

You're welcome! Hang in there as you practice looking for patterns. Watch my next tutorial for many more tricks

[@9MRSG]

Good job. X wing is a great thing to learn.

[@SudokuGuy]

Yes it is. 9MRSG. later i will show how the Xwing trick can be used in the skyscraper pattern. So glad you found my site."the most poular site on line to learn sudoku" Please share with others, 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/door/d8JaOdfEWcJOtwG6YayW0w kzbin.info www.sudokuguy.com

[@prabhattomar4587]

Thanks for this video. Very nice one

[@SudokuGuy]

So nice of you. 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. 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/door/d8JaOdfEWcJOtwG6YayW0w kzbin.info www.sudokuguy.com

[@prabhattomar4587]

@@SudokuGuy thanks

[@philotimoc904]

Excellent, thank you.

[@SudokuGuy]

You are welcome! 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/door/d8JaOdfEWcJOtwG6YayW0w kzbin.info www.sudokuguy.com

[@yogahealthcare007]

You are great sir 🙏🙏🙏🙏

[@SudokuGuy]

Thanks. Yoga, there is always something to learn eh! 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 kzbin.info www.sudokuguy.com

[@nagwaelsaraf4550]

Thanks..it's helpful

[@SudokuGuy]

Great Nagwa. The [art 2 next video is also helpful I hope. it takes time and practice to spot these. 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. 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/door/d8JaOdfEWcJOtwG6YayW0w kzbin.info www.sudokuguy.com

[@mahalingamm826]

Dear friend,very good.👌

[@SudokuGuy]

Thank you! Cheers! Please give me a thumbs up below the video if you liked it. kzbin.info

[@mahalingamm826]

@@SudokuGuy 👍

[@jacobwansleeben3364]

I'm guessing but fairly sure this technique is called the 'empty rectangle' because it is a proof that a candidate number cannot go into one of the 4 corner tiles that make up a rectangle of tiles that the candidate number otherwise can go into in each corner. In other words, the candidate number can potentially go into only three of the four corner tiles of the rectangle.

[@SudokuGuy]

Thanks for sharing. Jacob

[@user-A168]

good

[@SudokuGuy]

Super Next video will add to this one. It takes practice to find these.

[@antminehead]

I was confused by the concept of the 'empty rectangle' before I watched this video. I am now completely lost. I'm not even sure what I'm meant to be learning, it's never explained. I'm not 'hating' on the video but can someone please tell me what I'm missing here.

[@SudokuGuy]

HI Anthony. try part 2 s well. once you understand and practice it becomes easier. All the best.

[@antminehead]

@@SudokuGuy thanks for reply. I believe the penny has dropped finally!

[@bavanunthanpillay]

One has to be extremely patient for there is just too much repetition.

[@SudokuGuy]

That is because I am a teacher and know from experience new players in particular need this technique. of repeating. Thanks for your comment. You are obviously an experienced player. Many new players somehow go this advanced puzzle before learning from the beginning.

[@mcmurugan12]

👍

[@SudokuGuy]

Thanks for joining in the premier Mc. 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 kzbin.info www.sudokuguy.com

[@lehanoid]

The only I knew was that the figures can be all ways. Joking lol))

[@SudokuGuy]

Thanks. Love your sense of humour. Hang in there. and have fun. Lots to learn eh! You can do it!

[@kakungcu]

Empty Rectangle

[@SudokuGuy]

????

[@chezlerq4478]

Let’s make the 5 in the red square and the 5 in the yellow square the conjugate pair. The red square is now “X” and the blue square is now “Z”. Now make the new “X” true. Now all the 5’s in the “T” are false. Same thing if you make the 5 below the “T” the “X” and the 5 to the left of the “T” the “Z”. All 5’s in the “T” are false if "X" is true. Why would the 5 above the “T” be “X” and not the 5 to the right of the “T”????? ************************************* Never mind. I've spent time trying to work this out in my mind (and on paper) and I now understand it. I love your tutorials, but I think more time should have been spent working the conjugate pair forward and backwards. In this example, the "Z" square could ,in fact, be the "X" square. The system still works. I didn't really grasp it till I saw Tutorial #72 and at down and worked it out on my own. I think there just wasn't enough numbers on the board, (In tutorial #71) for it to make much sense to me. I have been a Quality assurance Tech and Mgr. for over 40 years. I've been building computers since 1986. Too little information means too much room for error. I see too many options, and too many directions. I've been working Sudoku in the paper and in books for many years. Learned on my own, and never knew of most of these patterns you teach. The simpler ones, like the matching pairs, were easy to figure out on my own years ago. Since I've been watching your videos, the time to solve puzzles has been greatly reduced and I am now working harder puzzles. Thank You. Love your videos, Robin. Keep up the good life. Charlie

[@SudokuGuy]

Thank you for your comments Charlie. And welcome aboard.