We revisit the Diabolical Sudoku we solved a couple of days ago and note other ways of making progress!
Пікірлер: 9
@JohnRandomness1052 жыл бұрын
3:00 Oops, I found a finned X-wing in 8s different from the one you described. It ruled out the same 8, though. 5:40 Okay, the Sashimi X-wing is what I found. The way I figure it is that an X-wing (swordfish, jellyfish, finned or not) works perfectly fine if the digit is barred from a cell in the device. (In each column, the digit is still restricted to one of the particular cells of the position.) 9:40 As for the 4s position, I found it as an empty rectangle rather than a finned X-wing. Again, the same 4 was eliminated. It seemed rather useless. However, now with the 8 occupying a remaining 4-cell, maybe not.
@wossaaaat5 жыл бұрын
Ah, sashimi... that's what I've been loosely calling 'that finned thingy' in other videos.... My sudoko app throws them at me all the time. They're dead easy to spot with highlighting turned on. I can sometimes spot them after staring at the pencil marks for a while, and usually directly searching for them. Without pencil marks, or with the limited pencil marks of snyder, I find it veeeery difficult to spot. Probably because I have the memory of a goldfish, so unless it's a couple of Rs/Cs restricted down to 2 or 3 empty squares with the same candidates, chances are I'll miss them....
@madchris473 жыл бұрын
there is another way to say that 8 can only go at 5 - 9 , if we supposed that 8 go at 5-4 we can see that the only position that 8 goes is 9-4 and this can be, so we can eliminate 8 (5-4) so we can eliminate 8(6-8) PS sorry for my english
@discountdadgaming3402 жыл бұрын
I know I'm very late to this, but couldn't you also eliminate the candidate 8 in r8c6 because of the skyscraper using r9c5 and r8c8, leaving only the 8 at r9c5 alive?
@javabeanz85496 жыл бұрын
I would give it a second thumbs up if I could, just for the pun ;o)
@Adam-hs4de4 жыл бұрын
Simon, it seems as though there should be other "rules" or "restrictions" to the fin x or sashimi fin x. Yes it all starts w a candidate locked in 2 positions in a row or column, but what about starting in a row/column in same box and then scanning to another box for the pattern? Imagine please locked 7s R9C7C9, scanning to sashimi value of 4 in R3C7 and a 7 candidate at R3C9 to make degenerate x wing; 7 candidate in R3C8 being fin. There's 1,7 pair in R1C7. By sashimi fin, I should eliminate that 7 thus solving 1 for that spot. It was wrong. I ran it w 7 as the value and it solved puzzle. Hence my opening statement of other rules/restrictions and everywhere I read online or other videos don't explain it. And I'm a smart guy so something is lost? Please help!
@JohnRandomness1052 жыл бұрын
Okay, these are the requirements for your situation: row 9 can have 7s only in columns 7 & 9. Row 3 can have no 7s outside of columns 7, 8, and 9. (You placed a 4 in R3C7, but the requirement is still satisfied.) In that situation, we can ignore row 9, and just focus on box 3. The 7 in row 3 is in box 3, so R1C7 must be a 1. It it were a 7, then row 3 could have no 7. The only way a 7 could be in R1C7 is if another cell in row 3 outside of box 3 could take a 7. The requirement must be violated.
@glidermike12 жыл бұрын
had perfect X on 4s witth C2 R2 & C7 R2 aligned with C2 R9 and C7 R9. You eliminated C7 R9 destoying my X, What is the presidence of one over other does finned trump X and how do you apply it. Totally confused