Thanks for the 6-7 pair in the second box on the top band; I do these every day, with the "auto candidate mode" for the hard one, and I was stuck for quite a while until I consulted your video; once I had that 6-7 everything fell into place!
11:40 Blocks 4 and 6 have a threatened deadly pattern. One might be tempted to assume uniqueness and place 6 in R4C3. Instead, I colored the cell and cornermarked it as a prediction. 13:00 This kind of situation is completely general. (I forget if I ran through this spiel before on this channel.) One can exclude a digit from cells in a pattern, and still have that pattern. In this case, it's possible for 5 to be excluded from one cell of a 567 triple and still have the triple. That allowed me to treat Sashimi X-wings and swordfish as finned versions well before I heard or read the name Sashimi. I treated skyscrapers as finned X-wings before I got it through my head what a skyscraper is. 16:00 Once, I thought that I had a deadly pattern, but it didn't occur to me that it occupied four blocks. Fortunately, I decided to continue until the crash. The crash never occurred and I finished the puzzle instead. 17:40 Whenever I'm stuck, I just centermark the grid, block by block. I did that this time, even with five digits in a cell. Either I find something that cracks open the puzzle, or I bifurcate using cornermarks. Fortunately, the former occurred here.
It stumped me too. It still would have helped to see how the rest of the row would behave instead of just running over it like it was pedestrian. Maybe I'll get it next time a "naked triple" comes up.
I find your explanations most helpful. I was stuck on this one until I watched the video. You found the 4 in box 3 at 13:22 and that was the key for me. I missed removing the triple digits from that cell even though I checked over the whole puzzle twice :)
Damn! I am relatively new to hard sudokus - and today got a huge issue where I could not solve it. Turns out I missed also the obvious hidden triple as you explained 12:00 (although I know the rule it just was not tested often in this combination that is harder to see). After that it went without any issues. It is crazy how missing such obvious thing can take so much time! Thanks for help
The thing about corner marks is once you place them you should never go back to try to figure out why you did that because you'll end up having to redo all your steps. Basically, once you corner mark and you know you did it right, after that just go on faith that you can use them to place digits. (Such as when you did Box 1 passing the 7, 4, then 2)
This puzzle was really nice. Easier than medium today and allowed me to use unique rectangle again. That alone prevented me from being stuck. But now I gotta see how you approached this puzzle.
I should probably look that up, I only know how to use the regular techniques Rangsk shows, took me like 36:25 (I didn't notice the 67 pair in box 2 till much later) whereas the medium took like 8:37
@@cmoihub smart hobbies explains it better, that's how I fully understood it. Another way to look at it is that if one cell sees a pair, that would easily remove 2 numbers and you give the answer.
@@cmoihub I explain the unique rectangle at 13:55 I also have this video that goes into uniqueness in-depth while solving a very clever fog puzzle by clover: ua-cam.com/video/BRqatlLmHyw/v-deo.html
The 567 triple in r3 eliminates the 7 from r3c1, not the other way around. It uses r3, not b1. Was my explanation at 12:00 unclear? I'm happy to explain further.
@@Rangsk I am not the best of knowing columns and row numbers. If the first column is a, and rows are number 1-9 starting at the top and going down, my questions is about a3 (column a, row 3 if I am numbering right). At 12:00 the only option you had in a3 was 4, but I had 3,4,7 & 9 as options and I cannot figure out how to eliminate any of those, but only the 7 would affect the triple. So how did you eliminate 7 from a3? I hope that makes sense.
But I am looking at it, I think I get it. It eliminates what I am calling a3, because if a3 was 7, then b3 and d3 would have to be 5 & 6 and that could not happen bc i3 has to be either 5 or 6. thus, a3 cannot be 7.
I'm relatively new but I thought I had no problem finding triples. Guess I was wrong, the 567 one at 12:00 made me restart the game 2 times and I still couldn't find it! I even did the unique rectangle technique before this and honestly thought that was going to solve the puzzle for me 🫠
I found the puzzle tricky today. Thanks for the walkthrough. Very helpful.
I'm doing this one today.
45:33
I needed your help to spot the 567 triple in row 3.
Thanks!
Thanks for the 6-7 pair in the second box on the top band; I do these every day, with the "auto candidate mode" for the hard one, and I was stuck for quite a while until I consulted your video; once I had that 6-7 everything fell into place!
Enjoyed the uniqueness/deadly pattern discussion as well. Helpful that you re-explain things because i only come back when i cant solve it on my own.
11:40 Blocks 4 and 6 have a threatened deadly pattern. One might be tempted to assume uniqueness and place 6 in R4C3. Instead, I colored the cell and cornermarked it as a prediction.
13:00 This kind of situation is completely general. (I forget if I ran through this spiel before on this channel.) One can exclude a digit from cells in a pattern, and still have that pattern. In this case, it's possible for 5 to be excluded from one cell of a 567 triple and still have the triple.
That allowed me to treat Sashimi X-wings and swordfish as finned versions well before I heard or read the name Sashimi. I treated skyscrapers as finned X-wings before I got it through my head what a skyscraper is.
16:00 Once, I thought that I had a deadly pattern, but it didn't occur to me that it occupied four blocks. Fortunately, I decided to continue until the crash. The crash never occurred and I finished the puzzle instead.
17:40 Whenever I'm stuck, I just centermark the grid, block by block. I did that this time, even with five digits in a cell. Either I find something that cracks open the puzzle, or I bifurcate using cornermarks. Fortunately, the former occurred here.
was stuck on that triple, thanks for the explanation!
Agh the triple got me! Havent had to look one up in a while
It stumped me too. It still would have helped to see how the rest of the row would behave instead of just running over it like it was pedestrian. Maybe I'll get it next time a "naked triple" comes up.
I find your explanations most helpful. I was stuck on this one until I watched the video. You found the 4 in box 3 at 13:22 and that was the key for me. I missed removing the triple digits from that cell even though I checked over the whole puzzle twice :)
Damn! I am relatively new to hard sudokus - and today got a huge issue where I could not solve it. Turns out I missed also the obvious hidden triple as you explained 12:00 (although I know the rule it just was not tested often in this combination that is harder to see). After that it went without any issues. It is crazy how missing such obvious thing can take so much time! Thanks for help
The thing about corner marks is once you place them you should never go back to try to figure out why you did that because you'll end up having to redo all your steps. Basically, once you corner mark and you know you did it right, after that just go on faith that you can use them to place digits. (Such as when you did Box 1 passing the 7, 4, then 2)
Great puzzle today!
8:53 for me. A little tricky, but not bad.
This puzzle was really nice. Easier than medium today and allowed me to use unique rectangle again. That alone prevented me from being stuck. But now I gotta see how you approached this puzzle.
I should probably look that up, I only know how to use the regular techniques Rangsk shows, took me like 36:25 (I didn't notice the 67 pair in box 2 till much later) whereas the medium took like 8:37
@@cmoihub smart hobbies explains it better, that's how I fully understood it. Another way to look at it is that if one cell sees a pair, that would easily remove 2 numbers and you give the answer.
@@cmoihub I explain the unique rectangle at 13:55 I also have this video that goes into uniqueness in-depth while solving a very clever fog puzzle by clover: ua-cam.com/video/BRqatlLmHyw/v-deo.html
Block 4 had 1,5,7 as givens. That gives you the 5/7 pair and nake 1 to start with. Leads quickly to the 3/4/9. Old NYT trick.
20:05 i misread the 268 triple(the orange box 6) and put an 8 by accident and got 3/4 solved and had to back track smh
for column 4 row 3, i dont get how it’s a hidden triplet because that square could have a 3 in it before you found the hidden triplet?
A rare L on this. I made loads of progress but got stuck towards the end and solved by bifurcation. Even a finned x wing didn't help!
How did you eliminate 7 from the 1st column, 3rd row.? That stopped me from finding the triple since I thought 7 could be in that box.
The 567 triple in r3 eliminates the 7 from r3c1, not the other way around. It uses r3, not b1. Was my explanation at 12:00 unclear? I'm happy to explain further.
@@Rangsk I am not the best of knowing columns and row numbers. If the first column is a, and rows are number 1-9 starting at the top and going down, my questions is about a3 (column a, row 3 if I am numbering right). At 12:00 the only option you had in a3 was 4, but I had 3,4,7 & 9 as options and I cannot figure out how to eliminate any of those, but only the 7 would affect the triple. So how did you eliminate 7 from a3? I hope that makes sense.
But I am looking at it, I think I get it. It eliminates what I am calling a3, because if a3 was 7, then b3 and d3 would have to be 5 & 6 and that could not happen bc i3 has to be either 5 or 6. thus, a3 cannot be 7.
I'm relatively new but I thought I had no problem finding triples. Guess I was wrong, the 567 one at 12:00 made me restart the game 2 times and I still couldn't find it! I even did the unique rectangle technique before this and honestly thought that was going to solve the puzzle for me 🫠
for column 4 row 3, i dont get how it’s a hidden triplet because that square could have a 3 in it before you found the hidden triplet?
for column 4 row 3, i dont get how it’s a hidden triplet because that square could have a 3 in it before you found the hidden triplet?
for column 4 row 3, i dont get how it’s a hidden triplet because that square could have a 3 in it before you found the hidden triplet?
for column 4 row 3, i dont get how it’s a hidden triplet because that square could have a 3 in it before you found the hidden triplet?