This video demonstrates solving a Region Sum Sudoku puzzle by applying three key constraints: standard Sudoku rules (1-9 in each row, column, and box), Region Sum Lines (box borders split blue lines into sections that must sum to equal values), and Kropki Pairs (black dots indicate 2:1 ratio, white dots indicate consecutive digits). The solver shows how to systematically eliminate possibilities by identifying triples (like 5-7-9 from three black dots), using sum constraints to narrow digit options, and leveraging consecutive relationships to place remaining digits.
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Deep Dive
"I remember Sudoku. In the Mountains" : BremSter without BremSterAdded:
Hi and welcome to Premister to Puzzles and back to another puzzle by full deck and missing a few cards. This one is called Blue Ridge Region Sums. Um, and I'm assuming because this looks a bit like a mountain range. And I am going to try this one as a BMster without Bremster. So, I'm going to try solving this one without doing full explanation.
Um, on the last one I did, I got a few people commenting that it was like, but you have to explain. It's like, and then I got quite a few people saying, I love these videos. So, I'm not sure on the best way of dealing with this, but I'm going to do another BMster without Bremster because the feedback mostly from full deck and missing a few cards was excellent. So, um I'm going to stick with that. Um I don't know anyone else who's done this as a video. If you do know someone another channel who's done this as a full explanation video, um leave a comment below and I will absolutely link to that in the description. But until someone else does it as a video, eh, we'll see how it goes. Um okay, let's quickly go through the rules. Um so we've got normal sudoku rules apply which means in every box in every row and in every column the digits 1 to nine must be placed without repetition. We have region sum lines. So box borders split blue lines into sections and the digits on those sections must sum to the same value. So for example if I pick this line the digits on that section must sum to the same as the digit in that section. Um and the same is true on all of the lines. And then crop key pairs digits in cell separated by a black dot are in a 2:1 ratio. digits in cells separated by a white dot are consecutive. They're the rules. Remember, I'm not going to be explaining, but I will be talking aloud my thoughts. Um, but I'm not going to go back and explain what I've seen. I'm going to restart the puzzle to restart my timer. Let's give this a shot. So, uh, does one of those have to be 36?
I'm not sure. Ooh, but this column has three black dots on it. So, those are 5, 7, and 9. So, this is 46. No. Uh, yeah. 468.
And this can't be an eight. Could it be a six? No, it can't. That's four.
So, this is at least seven, but can't be seven. That's eight. That's four. That's awesome. Which means those are one and three.
Um, that's cool. So, if this is 48, these are 1 2 3 6. I'll put that in, but I don't know why.
Now, does that Now, it doesn't have to be 36 anymore. Uh, in fact, ooh, no, this is interesting cuz the minimum here, this is now 7, 8, or 9.
Not sure on that one. In fact, what can that be? Because this can't be one or two. This is three. It can't be four.
This is three or six only. So this is 3 six.
Could that be three? Would that be one, two?
We put three up there. But if this is 36, what's that? That is one or two.
No, that's not necessarily No, that is necessarily true.
But 4 + 3.
So this is one or two.
And these are five, seven, and nine.
And this is either two, one, or four.
And it's not four. This is a one, two pair.
Oh, I've got three black dots here. So these, those, and that one are 579, giving me a 579 triple.
But if this is 579, this is 4 6 or 8.
That one could be eight.
In fact, what's this? This is 6 7 8 or 9 cuz of that.
And these are the same digit actually. That could be useful to note.
So, where's this in this box?
It's in one of those.
Maybe there's something else like that I could use.
This can't be a six. 4 + 6 is already 10. And I'm only going for a single digit. That's a three. That's a six. So these have to sum to six. So it's 1 five or two four. And I can't put five.
That's five. That's a two. That's a one.
That's a two.
The three looks across making that the one and that the three.
So one, two, that's now a three by Sudoku.
And these are six and eight, which puts six down here. But the four means this is an eight because it's not a two. And six is in one of those two.
But this is an eight. So it's got to be 8 1 9.
That's done nothing here. But these Well, this can't be a four or an eight anymore. So that's 6 three with that being 1 2.
So the six here means these can't sum to six. And this is 1 2 or three. And it can't be three. So these can't be nine.
And now where is yellow? Cuz it's got to be seven or eight.
So it's on one of those two.
But there must now be a one over here.
And it's not here.
But this is six with one or two. Uh is it there that I'm looking now?
What's row two?
579. I've got 579 again.
Am I going to end up coloring five sevens and nines? I don't know.
Well, the minimum here is four.
Exactly. That's not a problem.
But I know this sums to nine without having a one on it.
27 in either order.
36 or four five. That's really not helpful.
What about this? Well, actually this is a bit restricted. I've got to put two in one of those. If that's a two, that's a four.
What could this be?
Could be 1, two. It could be 2 4. Can't be 36.
Could it be 48? Actually, it could.
Well, this is seven or eight. So, what's this?
Must I have a two on this? I must have a two on this line. Cuz if there's no two on this line, I'd need a three on the line, and I don't have it. So, there's a two on this line, and it's either 124 or 125. And that can't be a five. This is a 1, two, or a four. And it's not a one.
This is a two or a four. And if this is a So what's this?
If this is a two, this would have to be a one or a four. If this is a four, this would be a two or an eight.
But this can't be a one. So 2 4 would work. Four 8 would work. Uh, not sure.
What about this? Is it this or is it this?
I'm not sure which line I'm looking at here.
One and two are both down here.
Oh, there's Oh, four means that's the five and there's no five in those. Means there's no five there either.
Seven and nine looking down.
Is that doing anything?
I think I'm definitely not Oh, hang on. The six means that's not a nine.
Yeah, I've completely missed all the consecutive dots, haven't I?
Well done, Broomster. Pay attention.
This isn't a nine. So, the nine is in one of those two. So these are from two uh two five seven one 1 2 3 4 6 8 there two has to be there. So this is only one or four and it's not one that's a four meaning that is a two and there's no two there and this now has to be four cuz it can't be one. So it's two four and this is three or five and the four comes out of there. This is 215 which means these are eight. Get rid of the coloring. And now where's eight?
It's not in any of those. It's not there. It's in one of those two. Could that be an eight? No, because that's a three-digit number. Oh, actually it could be something to a two-digit number. That could be an eight.
That's not a five anymore.
Oh, neither of those are a five because of the five looking down.
But there's no two on this anymore. And this sums to nine. So it's not 27.
And the four makes that the six, that the three.
The six looks like making that the eight and that the six.
There's no three here. So there's no six here.
Oh, this is eight. So this is 62.
Meaning there's no two here. So there's no one here.
These have to sum to eight. So it's either 1 7 2 6 or 35. It can't be 35. So there's no six here. This is 1 two. So this isn't one two. This is 3 six.
And that made sense for the one two.
So what thing is I don't know what that is yet.
Oh, the 69 looks down. The seven 9 looks out making that the six and this subs to eight. So it's 2 one. So this is only a one now.
Ah three.
That's three. That's eight.
And that's very powerful because now that digit is one less than that digit.
So this digit 1 2 3 4 5 79.
But this is one less than this.
So if this was a four, those would sum to eight. Well, those would sum to five.
Sorry, this is one more than this. So if this is a four, this would be a five. If this is a five, this would be a six. If this is a seven, this would be an eight.
And if this is a nine, that would be a 10. This is four, five, this is 5, six.
And the six looks of course making that the five and that the four. Eight and eight. Great.
The one of course makes that the two and that the one in here I need to put four, which must go there. And these are six and seven.
And the six makes that seven. That's six. 97 5 7.
This seven 8 n go in.
Seven says that's not a seven.
The three is in one of those two.
And that's a three.
The six is that's not the six. That's the six. So that's seven or nine. So five 9 75 nine. This is 35.
What are these?
These now 259.
Two and the nine means that's the five.
Take five out of those. The two makes that the nine that the two. Five means this has to be four or six and it can't be six. That's the four.
So now this is a one and these are two 9 two five makes that one. Five.
Something breaks this open, right?
Not yet. Okay. So, one.
So, these are six, seven, and eight. The seven means that's the seven, which means that's not the seven.
The eight makes that the six. That the eight. That the three. That the six.
That the five. That the three. That the nine. That the seven. That the five 9 7 9. 1 2 3 4 and 7. That was very fun.
That was a really nice region some puzzle. I really like the way you could kick off with the 579s. I definitely got lost in the weeds with the way that particularly this line worked, but the way this resolved with those two threes was really cool. And finding those eights um using I think it was this um the way this resolved was very very nice as well. I definitely got a little bit lost and missing the consecutive dots for as long as I did was a little bit dumb, but you know, sometimes I'm a little bit dumb. That was a lot of fun.
Thank you full deck and missing a few cards. I hope you appreciate the BMster without brimmster. I know I get a lot more positive comments than I do people asking for explanations, but I hope another channel picks up and does um solves with explanation of these puzzles so I can link to them. Thanks everyone for watching and as always, good luck with your solving.
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