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The New York Times Hard Sudoku: The Most Important Trick
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- เผยแพร่เมื่อ 30 ม.ค. 2019
- We "live-solve" the New York Times "Hard" Sudoku on 31 Jan 19. Simon discusses the importance of 3x3 scanning and demonstrates how this cracks the puzzle.
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Thank you so much for showing these solves 'warts-and-all' - it helps me know that its not just me sometimes! I found my first X-wing recently, what a buzz. Its funny how I understand even the more complicated techniques while being shown them, but all my tools evaporate as soon as a real puzzle is in front of me! I hope this is inexperience rather than old age!!
Another useful tip to keep me going through my slog amongst the foothills of Sudoku competence. Now, if I could only remember them.
save screenshots :D and name them …. X-wing...SwordFish… and so on :p
@@DaveGeelen88 I am building up a bit of an archive but persuading the old corpuscles to co-operate is the problem. Cheers!
I admit that I didn't recognize the obvious triples with row 8 and box 7, and that made me take longer and work harder. However, I think that disciplined(?) corner-pencilmarking and finding and center-pencilmarking cells with only two or three possible digits will gradually reveal and lay bare a hidden triple for all to see and observe.
Thank you this was good. I solved this puzzle previously and saw the triple quite late. It took me more than 30 minutes. I guess I normally work on rows and columns and then look for patterns. Perhaps I need to look for patterns as you said first and then work through rows and columns next. I'll try this and see if I get to the solution faster.
You make it look so easy, but I still struggle to solve these without center pencil marks. Even then I can get stuck.
Great video!
You’re so smart i like that
Great video. Do the NYTimes puzzles ever use such things as Xwings either normal or sashimi, swordfish, Wwings etc? I’ve spotted them occasionally.
I'm struggling to progress beyond Medium. I can't understand at about 7.48 - re the 1689, you say the 9 must go in block 4? Please excuse me being dense!
I solved it without the trick in the beginning, but I took longer.
At the very beginning in row 1, the 37 pair can only go in r1c1 and r1c8
Which software u using?
Does this puzzle have a uniqueness problem? You can reverse 5 and 9 in rows 1 and 3 i think.
The 5 in the upper right is given, so no.
jagmarz I see, thanks a lot. I solved that puzzle before watching the video and didn’t notice the placement of 5s and 9s but the fact that 5 is fixed makes sense.
@8:01 couldn't the nine go in row 2 column 2 instead, then the other nine could go in row 6 column 5
?
then you would have had repeated numbers in both boxes which is not allowed, these have unique solutions
I think you were talking about the logic that led to the 9 in row 6 column 2 @ 7:37. And the reason why that cell MUST be the nine in that row instead of row 6 column 5 is because it's the only number possible for that cell. He compares the contents of column 2 with the contents of row 6 and all the numbers are taken except a 9.
still no luck solving a hard sudoku ... i get about a 1/4 of the way through and hit a wall ... every stinkin' time
You didn't use much logic at all idd :D
So funny to see you struggle at very easy things, while you are 100 times better than I am at this :D
Finding the 9 in the bottom middle box, I see immediately that in the center box, 9 can only be on the left, and so on the upper middle box, the 59 are solved :D
And that took you like 30 secs :D
But the very hard things I don't find :D and you make that seem easy
Crazy how minds can be different, and even reality is different for everybody.
Because he was taking a different train of thought and following through with his methodologies to make the video more educational and easier to watch/follow.