The New York Times Hard Sudoku: The Most Important Trick

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The New York Times Hard Sudoku: The Most Important Trick

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Күн бұрын

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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Пікірлер: 24

@ridefast0 5 жыл бұрын

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!!

@grenvillephillips6998 5 жыл бұрын

Another useful tip to keep me going through my slog amongst the foothills of Sudoku competence. Now, if I could only remember them.

@DaveGeelen88 5 жыл бұрын

save screenshots :D and name them …. X-wing...SwordFish… and so on :p

@grenvillephillips6998 5 жыл бұрын

@@DaveGeelen88 I am building up a bit of an archive but persuading the old corpuscles to co-operate is the problem. Cheers!

@JohnRandomness105 2 жыл бұрын

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.

@bluestar2802 5 жыл бұрын

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.

@donnyh3497 6 ай бұрын

Great video!

@sandpiperbf9767 2 жыл бұрын

You make it look so easy, but I still struggle to solve these without center pencil marks. Even then I can get stuck.

@BK-or8bj 3 жыл бұрын

You’re so smart i like that

@johnoliver1891 3 жыл бұрын

Great video. Do the NYTimes puzzles ever use such things as Xwings either normal or sashimi, swordfish, Wwings etc? I’ve spotted them occasionally.

@barbaraclampin9184 10 ай бұрын

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!

@chookingvid 4 жыл бұрын

I solved it without the trick in the beginning, but I took longer.

@ashishjakhariya1523 5 жыл бұрын

Which software u using?

@gerasimos33 5 жыл бұрын

Does this puzzle have a uniqueness problem? You can reverse 5 and 9 in rows 1 and 3 i think.

@jagmarz 5 жыл бұрын

The 5 in the upper right is given, so no.

@gerasimos33 5 жыл бұрын

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.

@brianlutz7813 Жыл бұрын

still no luck solving a hard sudoku ... i get about a 1/4 of the way through and hit a wall ... every stinkin' time

@Ensivion 5 жыл бұрын

@8:01 couldn't the nine go in row 2 column 2 instead, then the other nine could go in row 6 column 5

@kai-ju5fv 5 жыл бұрын

@adityajogalekar2376 4 жыл бұрын

then you would have had repeated numbers in both boxes which is not allowed, these have unique solutions

@JohnSmith-rf1tx 3 жыл бұрын

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.

@user-yz8wr8vb7f 5 жыл бұрын

At the very beginning in row 1, the 37 pair can only go in r1c1 and r1c8

@DaveGeelen88 5 жыл бұрын

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.

@Jack-ye6fm 3 жыл бұрын

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.