Sudoku
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We take a look at this extremely powerful and important technique which comes up again and again in difficult puzzles.
20 user kommentieren dieses video
@veryfrostyjack3067
9:00 COuldnt the right cell be the pivot? 3 and 4 can see all others
@lukejuras8024
Can you eliminate the 7 in row 1, column 6, if you use the 2-6 as the pivot, and the 2-7 and 6-7 (found in box 2) as pincers? I paused the video and that was the xy wing I found, so I was a little confused that there was another xy wing as your example!
@olima-
There should definitely be a CtC history channel - this video looks so vintage in 2022. What a difference to nowadays.
@SenfSenferson
My Brain hurts ^^
@fabianowiti5250
I feed dumb because i just don't get the logic... I thought i was good at soduku.
@sylviacarlson3561
Does every puzzle have an XY wing? I've gone thru a hard puzzle and only kept the cells that have two numbers and I do not see an XY wing.
@JH-ub8nz
Is anyone else here in their 20s?
@MKIdefix92
I tried my hands on the last puzzel, but I cant solve it. I get stuck with thousend pencilmarks and only 7 singels entered so far. Its been 2 weeks..... I think I need help. I tried it various times with either 3 or 8 in r1c2 and it just seem like it doesn't work. I feel so stupid and frustrated
@everetmason7793
Thanks so much! FINALLY understand the Y-wing technique.
@Voodoo.77
I’ve worked sudoku puzzles for years. I NEVER have been able to find an XY wing. Apparently there’s something I’m not picking up on
@Cachirepublica
7:10 3 cells, 2 digits each. 3 unknown digits in total . Pivot is the one that look at the other two.
@Feenix102
I have a question. In the last puzzle you show, there is a 4-8 pairing in column one, and a 3-4 pairing in the same square right, square 7? In column 2? So, could the 4-8 and 3-4 pairing from square 7, columns 1 and 2, be in a Y wing with the 3-8 pairing at the top of column 2? In other words, could the y wing be in columns 1 and 2 or does it have to be in columns 2 and 3, and if so, why? Cheers. :o)
@nup418jekhicmem5
The voracious shrine partially whine because need complimentarily whip about a agonizing lawyer. wooden, hapless creditor
@rwprime1
Before you even start, in column 6 / row 2 how did you exclude the 2? Column 7 / row 2 how did you exclude the 4? And Column 7 / row 4 how did you exclude the 4? I just don't see it.
@MwambaHakunaMajuto
it seems a difficult thing to spot if you dont use full notation
@voljes9007
Thank you for this lesson, it's very clear and helpful!
@johnestranger7618
Actually in the first puzzle there is another XY-Wing (after swordfish): 267: r1c2, r2c1, r2c6. It eliminates the 7s in r1c56 which immediately gives us a 7 in r2c6 and a 4 in r1c5 and the nthe whole second square.
@ChongFrisbee
Wait. I'm having a hard time understanding why the 4 needed to be eliminated. When I look at the green triple, it seems that since 2 can't be in column 5, then there has to be a 2 in one of the other cells in the triple. And any of those 2 positioned would eliminate the 2 from the cell in columns 1
Is my reasoning mistaken or did Simon simply missed this reasoning?
@GaimeGuy
I can apply XY Wings, 3 linked color chains, and swordfish techniques, but I have an incredible amount of difficulty spotting them myself. On Andoku 3, these techniques are intrduced in the "Hard" tier of puzzles, and I usually find myself at a point where I have... about 30 or so squares left to fill in the puzzles, and all the pencil marks filled in, and I wind up flailing blindly from any 3-cell combo of 3-4 candidates with 2 candidates per cell I can find ("Hey, there's a cell with 56 candidates, a cell with 1 5 candidates, and a cell with 16, and a cell with 1 candidates, and look, the 5 or 1 or 6 has only two candidates in this house... maybe this will work. " And then a minute later I realize it was a dead end all along and I start scanning again, hoping to stumble upon a different chain or wing that bears fruit.
For example, in the puzzle at 7:12, my eyes immediately went towards columns 4 and 6 - the 34, 14, and 48 cells. If I were solving this puzzle myself, on my own, I probably would have started pencilling in the remaining candidates in subgrids 5 and 8, then and moved to subgrids 6 and 9.
I guess I just have bad intuition for these things since there's a bit of a spacial component to them, rather than mere set logic. Do you have any advice on getting better at them?
@jeffbrunton3291
Helpful, thanks
I call Y wings ‘bent triple’ as that helps me remember them more easily
But I realise I have only been looking for right angle versions, whereas I should be looking for more variations / 2 in a box