Mindset That Makes Solving Extreme Sudoku MUCH Easier - Sudoku Analysis 55
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- čas přidán 5. 08. 2024
- In Mindset That Makes Solving Extreme Sudoku MUCH Easier - Sudoku Analysis 55 by Smart Hobbies, I will show you how to solve a Classic Sudoku better than Mark Goodliffe of Cracking The Cryptic and have the mindset you need to solve Extreme Sudoku. Mark originally solved this Extreme rated Sudoku on Cracking The Cryptic using an unorthodox solving strategy. I improve upon Mark Goodliffe’s strategy and show you how you can solve very hard Sudoku. 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.
I used the software program CTC App for this solving video. Puzzle link:
sudokupad.app/cxngouw8li
Original Cracking The Cryptic video link:
• Following a Logic Chai...
This video is part of my Sudoku Analysis series on my CZcams channel, Smart Hobbies. The goal of this series is to share the joy of analyzing Sudoku puzzles solved by some of the world’s best solvers.
#learn #sudoku #youareawesome
Strategies demonstrated in this video:
Hidden Single
Naked Single
Full House
Pointing Pair
Naked Pair
Hidden Pair
Naked Triple
Extreme Strategy
Timestamps
0:00 Intro
00:18 It’s Solving Time
00:29 Puzzle Story
00:56 Finding Snyder Restrictions
02:56 BONUS Tip #1
06:45 How To Find Extreme Strategy
07:45 Extreme Strategy Revealed
11:17 Next Puzzle Steps
13:49 BONUS Tip #2
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Let me know what you think and how you did in the comments below. Thank you so much for watching.
Timberlake
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📕Get my FREE Solving Guide that will help you solve over 80% of all Sudoku puzzles🧩to include NYT Hard👉👉www.buymeacoffee.com/timberlakeB/e/125822
Timestamps
0:00 Intro
00:18 It’s Solving Time
00:29 Puzzle Story
00:56 Finding Snyder Restrictions
02:56 BONUS Tip #1
06:45 How To Find Extreme Strategy
07:45 Extreme Strategy Revealed
11:17 Next Puzzle Steps
13:49 BONUS Tip #2
"Mark solved this with bifurcation, but we're going to try something different..."
Proceeds to solve through bifurcation and incorrectly refers to a broken puzzle as a deadly pattern.
You got a point. Do you see a better way to solve or explain this?
10:27 I was always taught that using uniqueness to solve a puzzle is a no no. It doesn't prove that a puzzle has a unique solution, just makes it possible to solve it one way.
That is a great point. What I did here did not rely on the puzzle being unique. It started with a premise of what could be the value of 2 of the cells in the puzzle. Without a 5 in one of those cells, there is no way for the 6's to solve themselves. This is a similar approach used when solving Sudoku Oddagons. Hope that helps.
I cld do only the bott horizontal chute with those pairs and a triple left , after that a BIG NO NO...
But that is very difficult , u magically pick up the 68 pair in col 8 of box 6 and start ur investigation in its vicinity to find an error . I guess the SIA gave u some clues to start ur investigation in that area of the grid.
BTW what is SIA?
Sudoku intelligence agency.
I'll again watch the oddagon strategy, if I find time.
Thanks for the extreme version !
Super insane sudoku. My time was around 13min, but I only could solve after watch the part "extreme strategy revealed". I didn't remember this one at all! Thanks for the tips! 🎉
You are welcome. Great job getting this in 13 minutes, even with a little help.
I’m featuring popular CTC Classic videos I haven’t before. I have to go back to 2020 and 2019 to get puzzles I haven’t covered. Do you have any recommendations?
@@SmartHobbies I haven't sorry. After so many years following them, I did and watch so many puzzles (plus Sleuth and Bremster), that I can solve sudokus from last year as a brand new one 😅
@@anaayoung9142 I started watching them in late 2020, so anything before that is new to me.
7:00 This took me forever. My bottom band and center-cell 4 were identical to the video's position here. I had a lot more corner marks, including the green 37 restricted to block 6 in column 7. I followed my usual practice of centermarking the blocks, and that may be what got me lost in the middle of nowhere. I really don't want to describe what I went through to solve this puzzle.
This was a very tough puzzle, John. I spent hours trying to find a smooth way to solve this, and the video version is the best I could come up with.
@@SmartHobbies Hours trying to find a smooth solve path, as opposed to my hours trying to do it -- finally succeeding?
Great explanation, except maybe for the 13:10 part - why 3 has to be there? Not getting it...
Great question. After you place the 9 in R7C4, you can look at R7C3 and see what digit can go there. 3 is the only digit possible because of all other digits see that cell either in the row, column, or block. Does that help?
@@SmartHobbies not really, I'm referring to R1C5, you put 3 there right after putting 2 to R1C6 (around min 13:10) - no idea why only 3 is left as an option there
Row 1 needed 2345 to complete it. 45 were in block 2 and had to go outside block 2 into row 1. That left 2 and 3 to fill the two cells in block 2.
Thank you John. Another way to look at it is that the 89 from row 1 could only go in row 2 in Block 2, leaving 2 spots left for 2 and 3, and there is a 3 already in column 6
@@SmartHobbies yes, I missed that, I focused on the block, not row 1; thx, much appreciated
Tough puzzle, tried and stuck at 7:00, no strategy was helped, saw vedio , very nice soft and easy solution and explanation.
I tried after the same little change...
r3c8 -9 is eliminated, because,
If r3c8 is 9, then 45,45,45,245 UR in Col 7&8 row 1&8. It gives 2,4,5 in box 9 middle.
r8c8 4 make r1c8 to 5, and it gives 68 pairs in box 6.
Now X wing 8s in Col 3 & 8, gives 36 pairs in box 5, and it makes r8c5 is 6.
Now X wing 6s in Col 4 & 8., eliminate 6s in box 4., and it makes r1c3 is 6.
Now r1c3 is 6 & r8c5 is 6s, it makes the same problem no place for 6 in box 2.
Because 9 eliminated from r3c8 and spotted 9 in r1c8, puzzle solved.
Nice Tough puzzle thanks.
Nice job. I am glad you found it helpful.
As usual, there is no way in the world that I could have solved this without virtual chaining. I solved it half a dozen times, but always with at least one chain. Here is perhaps my simplest way through, using a two-way chain (75 = row 7 column 5; second write-in):
99, 75, 76, 78, 98,
91, 74, 82, 92, 73,
55 (all easy up to here, but then…),
59 (forced, irrespective of the order of the 6/8 pair in box 8)*,
69, 89, 87, 88, 18 (restricted 5s in box 6, irrespective of the order of the 6/8 pair in box 8),
13 (naked single),
35, 84, 85, 26, 25,
56, 31, 43, 53, 44,
54, 15, 16, 95, 96,
66, 41, 58, 23, 42,
71, 72, 47, 57, 45,
65, 52, 48, 11, 37,
38, 67, 68, 27, 32,
21, 22, 61, 62, 37.
* R8C5 = 6 → R1C6 = 6 → R3C1 = 6 → R6C8 = 6 → R6C7 = 1 → R5C9 = 2.
R8C5 = 8 → R2C6 = 8 → R6C7/C8 = 1/8 pair → R5C9 = 2.
Some of my other solutions included uniqueness arguments, but Mark would certainly disapprove of those.
Afterthought:
Well, my reasoning at the crunch point was very different, but the result was much the same. I'm quite happy with that, but your 'virtual' UR (Type 4?) was far more elegant. Interestingly, the HoDoKu rating you give is rather lower than it might be. My version reports Extreme 4492 or 4872, depending on whether uniqueness arguments are allowed.
Edited to add the afterthought.
Thank you Julian. I like how you tried this from different angles. Not sure why Hodoku rating was so different.
Right from the start, I noticed that 1,5,7 couldn't be placed on the first 4 cells of row 7. That observation, typical for The New York Times Hard Sudoku made it very easy to sove the last 3 blocks to the point where you then have to use advanced strategies.
Wow. Great observation. I have seen many hidden triples shown like this in the NYT hard. Thank you for sharing.
Did you call the strategy “autogon”? Is that how you spell it?
Thank you for asking. It is like an Oddagon. I explain the concept in depth on this tutorial: czcams.com/video/Vf-HMsB00AI/video.htmlsi=IBXXHG-i-QtPGNc-
Hi, Thank you for the post! I have a question. When there are 8s in col 3, 4 and 8 on rows 4 and 5, do you still have an X wing? When I saw that, I just assumed the 8 in col 8 were no longer valid. Was I correct? Thank you!
Great question Kenneth. A true X-Wing covers 4 different blocks. When you have 8s in rows 4 and 5, keeping the 4 cells in 2 blocks, then that is commonly referred to as a "mini X-wing" which is useful for finding Claiming Pairs but is not a true X-Wing. Does that help?
@@SmartHobbies Thank you for your reply. I think I understand what an X wing is, but in this case, there are 6 eights in a rectangle. Are you saying that since there are two additional 8s, it’s no longer an X wing? Thank you!
@@kennethmiu691 in this case, it is not an X-Wing.
(5,5)=4 cuat(3,6,8,9) en 4a col ent (7,4)=9 (8,2)=9 (9,1)=8; par (6,8) en 8a fila dentro del bloque 8 y tercia(2,4,5) dentro del bloque 9 ent (9,2)=6; par (2,4) en 7a fila dentro del bloque 7 ent (7,3)=3; cuat (6,7,8,9) en 3a col; cuat(1,2,5,9 en 9a col ent (9,9)=1 (9,8)=3 (7,8)=7; par(1,5) en 7a fila dentro del bloque 8 ent (7,5)=1 (7,6)=5; par(2,7) en 9a fila dentro del bloque 8; hasta aquí queda atorado el Sudoku, trato de desbloquearlo haciendo un Tanteo por Combinaciones entre las casillas (5,9)=(2,5,9) con (6,9)=(5,9). Primero la combinación (6,9)=5 con (5,9)=2 se llega a un Error! en las casilla (8,9)=(2,5) no habría lugar para cualquier número, quedaría vacia; luego la combinación (6,9)=5 con (5,9)=5 obviamente es un Error! se está duplicando el #5 en 9a col y dentro del bloque 6 y finalmente la combinación (6,9)=5 con (5,9)=9 no se ve tan obvio pero desarrollando un poco se llega a un Error! se duplica el #7 en 6a fila, por lo tanto en la casilla (6,9)=9...