These 2 Tricks Can Solve Most Of The World’s Hardest Sudokus

In These 2 Tricks Can Solve Most Of The World’s Hardest Sudokus by Smart Hobbies, I will show 2 tricks you can use that will solve most of the puzzles on the World’s Hardest Sudoku list. I show you these 2 trick plus all of the other tips, techniques, and strategies you need to solve a Classic Sudoku from the World’s Hardest Sudoku list on the Sudoku Player’s Forum. I show you how to play Sudoku better and how to solve Sudoku faster. I solve this puzzle logically and explain all the expert Sudoku tricks, Sudoku techniques, and Sudoku strategies as I apply them to the Sudoku game.
#learn #play #sudoku

I used the software program SudokuPad for this solving video. Puzzle link:

Learn more about the World’s Hardest Sudoku List here:

Check out Smart Hobbies page on Harold Nolte’s Sudoku Primer website here:

Contact me here:
Discord: Timberlake#1905

Timestamps
0:00 Intro
00:22 It’s Solving Time
01:05 World’s Hardest Sudoku List
02:16 Trick #1
05:49 Symmetrical Version of Tridragon
06:30 Trick #2
10:24 Continuing Solving Original Puzzle
13:24 Advanced Strategy #1
15:50 Advanced Strategy #2
17:10 Advanced Strategy #3

Strategies demonstrated in this video:

Hidden Single
Naked Single
Full House
Naked Pair
Hidden Pair
Naked Triple
Sudoku Symmetry
Trivalue Oddagon
Skyscraper
Remote Pairs

Let me know what you think and how you did in the comments below. Thank you so much for watching.

Timberlake
#puzzle
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#sudokupuzzles
#sudokutricks
#expertsudoku
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#MondayMention
#WednesdayWish
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#SaturdaySolve

[SmartHobbies]

Timestamps
0:00 Intro
00:22 It’s Solving Time
01:05 World’s Hardest Sudoku List
02:16 Trick #1
05:49 Symmetrical Version of Tridragon
06:30 Trick #2
10:24 Continuing Solving Original Puzzle
13:24 Advanced Strategy #1
15:50 Advanced Strategy #2
17:10 Advanced Strategy #3

[dragade]

@6:10 Like in math, commutative property doesnt change the result. So that I can write A*B=B*A or rearrange the sudoku puzzle to look a bit differently, as long as this is the same puzzle, then it doesnt matter if you move rows or columns around to make it easier to see.

What you did to this puzzle, it is the same puzzle as you were given. Solving B*A faster than solving A*B is perfectly fine.

[andrewmovius]

Symmetry is just another way to look at the puzzle.

[jonminer]

Y

a hoo! That was great! Thank you so much. Thanks for sharing! Stay Healthy!

[KarstenJohansson]

As soon as the 4 was given, I was able to go far enough that I got the "easter egg" top line, plus located most the 589 and 89 squares. Got stuck exactly where you said (stop looking over my shoulder!). The skyscraper was new to me, and I'll have to look for it from now on. The final strategy will have to wait til I get that in my sudoku vocabulary. This was a great way to show how the skyscraper works, fo' sho'!

[danik]

You know a puzzle is hard when you have to use the meta-logic of "we know this is no-guess".

[mgeo]

So cool to see how someone who knows what their doing solves these!

[paulakeay]

I solved this with a tri-oddagon, skyscraper, a finned x-wing and found an XYZ wing too. Can’t remember exact order. I didn’t find any useful remote pairs, but I think I eliminated a 5 in some other way. Took a while, but got there in the end! Intrigued to watch your video now as it looks like we had different solves, and keen to learn still!

[LearnSomethingNewEveryDay]

Great video, its can be enlightening to see things from a different perspective! Now I have to check out your coffee!!! 🤩

[michaelmott]

Swapping rows is an aid to understand a pattern more generally. In this case, It provides another view of the triples (with one addition) across four blocks.
I saw the 34 pair and the 4 triples but didn't make the connection with the earlier puzzle. I then ground at it until stuck and came back to watch the video. After I saw the pattern leading to the 4 in block 5, my mind said duh. Then I filled out most of the puzzle and found a skyscraper on 5, that enabled me to solve it the rest of the way.
Swapping rows is another tool in the toolbox. n

[edwardmonte]

With the skyscrapper, I can see why (4, 6) cannot be a 5 if (4, 3) is a 5, but I can't see why (4, 6) must be a 5 if (4, 3) isn't a 5. There are 2 other locations in Row 4 that are marked as possible 5s.

[tjmozdzen]

Love the swapping of rows, columns and block rows or block columns. I'd say go for it, but since I don't think this is easy to do with current tools of on-line puzzles, then it is too much trouble. I personally don't like "chains", too much trouble to decide when one must look for a chain - same with coloring.

[JohnRandomness]

I was certain that this featured the same feature that an earlier puzzle featured a while ago: three digits 589 arranged so that they couldn't fill all their cells without colliding. Like the earlier puzzle, one cell contained a fourth option that saved the puzzle. I had to test carefully that all 589 combinations broke the puzzle, and I'm terrible at three colors. Once I placed that 4, I placed several other digits as well.

I got sort-of stuck then. I centermarked the rest of the grid, and found two skyscrapers (in 5 and 9). I also found something that began as a 239 Y-wing, but required a chain to find a second 3, to eliminate a 3 from column 8 and give me 29 pair. I was still stuck. Finally, I bifurcated on the 58 cell R5C7. 8 caused collisions; 5 was the correct digit.

6:20 Yes, I recognize that switching rows doesn't change anything about the puzzle. I suspect that one who notices that doesn't really need to swap things in the first place.

15:50 I missed that second skyscraper in 5s. Had I found it, I might have avoided the bifurcation. The bifurcation cell was one of the base cells of the skyscraper.
17:40 Better still: the cell I bifurcated on was the cell you solved using remote pairs. (The first skyscraper removed the 9.) I tried remote pairs earlier, but got nowhere.

[JPRobinso]

Excellent video - your explanation of the scyscrapers now makes sense to me where it didn't before. 2 rows with only two options, 2 in same column, 2 elsewhere (pink) wherever pink see each other can not be the value.

[anaayoung]

To solve a puzzle every "trick" can be use. The chain stuff that you are very good at. But this is not something that would use, because if hard for me to visualize.

And yes!!! I knew it has something to do with the 589 triple! 🎉

To me: if 5 is in R9C1 we can't place 9 in box 4 or box 8. Then after 2 fives. I can see that, if 5 is in R8C4 we can't place 5 in box 9 or box 5. I know what a skyscraper is but sometimes is hard for me...😅
Thank you! 😎

[simonharris]

You don't really need to re-factor the puzzle at all though. You can just make the rule that the 3 589s need to be on different rows and different columns. Wouldn't that yield the same result?

[ketv]

Centermarking the heavy houses, I spotted the trivalue collection immediately without isomorphism, probably because you did Loki so recently. Then, I'm ashamed of myself. No amount of staring revealed the skyscrapers, and I got your help on the first one. The second one was obvious once I saw the first one. Then I didn't spot the remote pair, but used an XY chain on the 89's to put a 3 in R6C4.

[alexforest]

That was awesome! I got to learn about remote pairs and a bit about shuffling the board around... not sure if I can swap a column and also a row while rearranging while keeping it fundamental the same puzzle (think top square a1 to b2). The Tower trick went over my head. Thor's hammer! What a cool pattern.
I am going to enjoy moving things around to find patterns.

[mitchellschoenbrun]

There's nothing wrong with switching numbers, rows, columns and blocks around. You could in principle just undo your switches when finished.

[beardlyinteresting]

If i hadn't seen your other video on tridagons i wouldn't have been able to solve it.

Colouring the 589 squares with blue/yellow/pink actually made it trivial to solve because once I solved which number belonged to which colour it all worked out.