Extreme Sudoku: Wings, Skyscrapers & Empty Rectangles

Simon takes a look at this "extreme" rated puzzle requested by one of our viewers. As usual, these solves allow us to showcase some exotic techniques. This time we have x-wings, y-wings, skyscrapers and empty rectangles!!

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#Sudoku
#crypticcracking
#commitsudoku
#xwing
#skyscraper

[DougalAAllan]

Possibly one of the most instructional videos on the channel.
X-wings, Y-wings, Skyscrapers and Empty Rectangles all shown and explained in clear terms with visual aids besides.
Glorious.

[notchinthebedpost]

9:00 skyscraper
12:40 x wing
16:45 empty rectangle

[jojojGaming]

who's here in 2021 smiling at Simon apologising for a 27 minute solve.

[othafakk]

15:01 "I feel like I'm missing something here." Shouting at the screen "The five in the 8th row!!!"

[cadmar]

Beautiful! Do enjoy the logic and the step-by-step explanation using empty rectangles and skyscrapers!!!

[pedroslots]

Really appreciated the logic at the end rather than the 'brute force' so thank you for that. Not that I have anything against the speed solving techniques, just a fan of the logic more.

[sdrawkcab]

The additional drawings really help demonstrate the difficult concepts. Thanks for continuing to add them!

[Lohoydo]

This video taught me more than most others combined. Taking the time to explain not just the logic of a wing, skyscraper etc. but how to find them helped immensely. A well chosen puzzle for the tactics too as the wings, skyscrapers and empty rectangles abound. I ended up solving it using several different combos than he did

[bonkers_dave]

It is insanely gratifying to spot something that you miss, because it does not happen often, and usually you are on it within a minute or so. But in this case I noticed at 12:29 you had 7-9, 1-7-9, 1-7-9 in row 8, which leaves a 5 only in column 6, which lets you place two 5's at that point. It took you until 21:30 to place those 5's. Maybe there is hope for me after all! I'm sure others have pointed this out, but I did not read all the comments. Just basking in the glory...

[lestersullivan]

You explain that so beautifully. Thank you. Now if only I could just recognize these situations when they arise. Spotting them as I work though the puzzle seems to be the hardest part. I guess it just takes more practice.

[renaunap]

New to sudoku world and I'm mad I didn't learn sooner... sudoku is great. Thanks for explaining in a way my beginner's mind could understand. 🙏🏽❤️

[LuisHartmann]

These videos just made me addicted to sudoku... and this video made a really good job at explaining these techniques

[lukefisher]

Don't be sorry. I am learning so much and solving much harder puzzles than ever before. Thanks!

[ThatGuy-djqr]

Thanks so much for taking the time to explain the many techniques that you use. I am really learning a lot from you and from these videos.

[mtg]

Haven't watched Simon's solve yet but I completed it in 12:39 using an X-wing, Y-wing, skyscraper and an XYZ-wing. I think there was also a hidden pair and some naked triples.

[sweetpeabrown]

Huge help. Thanks. I couldn't understand how the the hints worked till you explained it so patiently!

[PaulaZF]

A great tutorial in the X-wing, Y-wing, skyscraper and Empty Rectangle in one swell food! Thank you!

[ugyennorbu]

That was one roller-coster ride of logic.. Great work as always..

[fraewn]

Please more technique videos, I learnt a lot from this. Bought your app and it is so much fun

[perry]

Thank you for that great explanation of empty rectangles. (and the other techniques but especially empty rectangles)