NYT Hard Sudoku Walkthrough | February 12, 2024
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- Опубліковано 10 лют 2025
- Solving today's The New York Times Hard Sudoku for February 12, 2024
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After the hidden triple, it was the hidden single in box 6 that held the puzzle up for me. Still a fun puzzle
Heh -- I also started with NYT trick in the top band, and I made great progress through my corner-marks and then center marks. I had to stare at mine a LONG time before I saw the 6,7,8 triple in row 6. Once I saw that triple, my solve immediately collapsed pretty much like yours.
Thanks for posting another fun solve.
The 6,7,8 triple was really hidden. It's annoyting to me that you can't really see that stuff unless you make notes and I don't like solving sudoku with notes.
Same here! What a stubborn puzzle, but fun.
This puzzle features a naked single in Row-4, Col-7... BOOM...!
Yes, one that I was overlooking for an hour..
Completed in 7m15s
Puzzle was fairly smooth until that 678 triple in r6 which had me stuck until I looked at this vid. Do you have any advice on how to spot these (apart from well, spotting them :P) as hidden triples like these have tripped me up a couple of times.
Be suspicious of any restricted cell. Do an intentional scan of its row, column, and box and try to find any other restricted cells that you've marked which match it or closely match it. After I filled that 78, you can see I paused for a little bit as I scanned around it, and that's when I noticed the triple.
Good question. I've been wondering the same thing. And Rangsk, thanks for the good answer!
I know that the approach suggested and used by @Rangsk is faster, especially in the hands of a solver as accomplished as he is. I use a slower and more methodical approach that often works. I traverse the digits from 1-9, corner-marking each box with exactly two instances of whatever digit I'm on. This frequently reveals singles and pairs, and so it needs to be repeated (from 1-9) until no further changes result. This is much slower (it usually takes me 10-15 minutes) and has the advantage that it reliably captures all cells with corner-marks. Unlike Rangsk, I never corner-mark more than two cells in a given box.
It is worth observing that the NYT Trick is MUCH faster than the above traversal and immediately yields results that corner-marking sometimes misses (in some puzzles).
The "NYT Trick" is explained well by Rangsk in a few recent episodes. I look for a box with an empty row or column, then I look outside the box in that row or column for digits NOT in the box. Then I count empty cells in that row or column. If there are the same number of empty cells as digits in the box, then the tuple containing those digits can be placed in the row or column outside the box. Once that's done, another tuple containing the leftover digits can be placed inside the box in the row or column, and finally a third tuple can be placed in the empty cells inside the box that are not in the row or column. It takes longer to describe than to perform, and it often causes an entire band or stack to collapse.
I admire the speed and accuracy of Rangsk at following his approach, and I highly recommend it if you're able to do it. I've ended up continuing my brute-force approach because I so often miss obvious steps while attempting to emulate Rangsk. I should note that I always do Sudoku at the end of a day, and I often share a bottle of wine with my lovely wife during dinner. My brute force approach is probably less susceptible to the after-effects of the wine. :)