Learn To Solve Diabolical/Extreme Sudoku - The XYZ Wing
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- čas přidán 8. 12. 2018
- We take a look at last Friday's Diabolical Sudoku from The Daily Telegraph. Nothing too hard until an XYZ wing appears - and this is a good chance to explain the difference between this and a Y-Wing!
Just ran into the xyz-wing in my latest puzzle. Thank God for this channel. I've been picking up sudoku (again) and I had never really delved too deeply into strategy before. Your channel has been helping me understand some truly difficult stuff for my brain to understand simply from a written explanation.
I suspect that these "bent triples" were in some of my previous diabolicals, so I will definitely be looking for them in the future. It is much more elegant than my forcing chain method, which I use as a last resort.
Love the bent triples, this is going to revolutionise completing my sudoku books.
I prefer the (equivalent, arguably simpler) reasoning: an 8 in R2C3 is unacceptable, because assuming 8 in R2C3 leads to an illegal outcome, namely forcing a 3 in R3C2 and a 4 in R8C3, thereby eliminating all candidates (348) for R3C3. This reasoning would also apply to R1C3, if that cell were not already fixed. Just a different way of thinking about the XYZ wing.
what are you talking about
Make sense
Thank you for another lesson!
Nice explanation!
Great stuff
Very helpful
I know this is very late and unlikely to get a reply but at 4:26 how did you resolve that 4? I can’t see why you could rule it out of the top left corner of the grid, or the bottom two corners of its box.
Same I'm also wondering
@@Onika4203C6 has 2 and 9
Row 1, C1,5&6 must contain either 2,4 or 9. Well column 6 already has a 2 and a 9 in it, leaving only 4.
@@Has39.bfpo43 Oh my god how did I not see that, thank you!
This sudoku can be solved using only basic and tough strategies.
may i ask you please. How we can have the App you are using?
4:22 why is 4 not possible in C1R1?
Because R1C7 and R1C9 can only contain 7 or 8. The remaining squares can contain 2,4,9. Now in R1C6 there can only be a 4 because of the 2 and 9 in the rest of column
What application is that?
What is the name of the program you are using?
This one is Duncan's Sudoku Solver. They used several interfaces in older videos like this, before they created their own.
Speaking of which, I wish they'd take some time to port these old puzzles to it, or even better, give us a configurable grid.
This puzzle has way more numbers to begin with than what i just starter solving.. im stuck 😅
At 4:27, how did you know that that particular cell ina first row has to be no 4?
The two and nine are already in the sixth column, lower down. (We were looking for 2,4 or 9 in the first row).
@@zacharysherry2910 but 4 could go into the first cell (top left) as well at that moment, no?
@@ivandolinic5675 no, because since 2 and 9 cannot go there then 4 is the only option without doubling Numbers in column six
@@zacharysherry2910 ok i just got it now.. another question, how did you end looking for specific numbers such as 2 4 and 9?
@@ivandolinic5675because those are the only three numbers left to find in the first row, since 7+8 are already going to be taking up the squares in the 7th and 9th column (in whichever order).
Where's the puzzle?
Why must it be a 4 at 4:26 ?
2,4,9 for possibility , and the column already have 2,9 so must be 4
Why must it be a 4 at 4:26
Because it couldn’t be a 2 or 9
this is not extreme... I'd call it hard.