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## CHAT LOG for Friday, January 19, 2007

12:06 am
skizzybiz

let's see here...
12:07 am
moe

hey andy
12:08 am
moo

hi
12:08 am
btwrt

i've been plugging away for 7 minutes ...
12:08 am
skizzybiz

moo!
12:09 am
skizzybiz

i like to not plug away. this game can be really soothing when you let it be :)
12:10 am
btwrt

ahh, i think i'm wanting to complete at least ONE thing today ...
12:11 am

Done .... now off to work!
12:15 am
btwrt

done :D yay
12:17 am
raggedyandy3478

done
12:21 am
skizzybiz

there's always one really obvious move that i miss when i don't use greens
12:21 am
kebek

yeah, i know what you mean
12:25 am
moe

finally done
12:25 am
skizzybiz

man, i'm so exhausted
12:25 am
skizzybiz

i'm gonna finish this tomorrow
12:25 am
moo

me too
12:37 am
drwho

Difficulty score 24. Tougher than yesterday's (a 22 which I think was too high), but still no green. Cross hatching and region intersection analysis will do it.
12:38 am
moo

what's region intersection analysis?
12:41 am
drwho

Two regions intersect, i.e. a row and a 3x3 block or a column and a 3x3 block. The 3 cells where they intersect are significant. For instance, if you examine a row and find that the digit 3 can only go in 2 cells of that row, if the 2 cells are both in the intersection of the row and a block, then the digit 3 cannot go in any other cells of the block.
12:43 am
moo

thanks
12:43 am
drwho

12:44 am
drwho

If you think about it long enough it should.
12:44 am
moo

it did
12:45 am
drwho

The technique can start with a 3x3 block and then reduce the possibilities for a row or column too.
12:47 am
drwho

Just as long as you have reduced the possible locations of a particular digit in a particular region the the intersection of 2 regions. In that case the digit is limited to the same cells for both regions.
12:47 am
moo

i'm not sure i understood that last bit
12:48 am
moo

but i've finished. :) finally
12:49 am
drwho

When examining any region (a row, column or block) if you find you can limit a digit to a the 2 or 3 cells where that region intersects another, then the digit is limited to the same cells for the other region too.
12:51 am
moo

ok that makes sense. thanks
12:51 am
drwho

You're welcome.
12:57 am
drwho

The technique works because if a digit appears in the intersection of 2 regions, it satisfies the requirement that the digit appear at least once in each region. If it appeared anywhere else in either region then it would appear twice in at least one of them violating the requirement of only appearing once in any region.
1:01 am

Hey drwho, I've tried to follow what you're explaining without much luck. Maybe I need to see an example.
1:03 am
drwho

Look more closely at the last statement. All the digits appearing in the intersection of a row and block appear in both the row and the block.
1:03 am
drwho

So, they cannot appear twice in either the row or the block.
1:05 am
drwho

This means, when you have determined that a digit can only go in the intersection of a row and a block, it can go nowhere else. If you started by looking at the row, then you can eliminate all the other cells in the block as possible locations for that digit.
1:09 am
drwho

For example, suppose I examined the top row and determined that the digit 1 could only go in the 3 left most cells of that row. Those three cells also belong the the upper left 3x3 block. Now examining the block might reveal other places the digit 1 could go, but I can eliminate them because it must go in the first row. If it goes anywhere else it will appear twice in the block.
1:11 am
austinuu

how do you come up with the numerical measure of difficulty? What's a 24 out of?
1:11 am

OK, now I see. I was not following what you meant by intersecting. I was picturing a row adjacent to a block, not within it. Thanks.
1:12 am
drwho

The score is computer generated. It can best be viewed as a measure of how long the puzzle might take to solve.
1:14 am
austinuu

what's the highest maximum score?
1:14 am
drwho

No, not 24 minutes. It depends on your skill level. And I am not too sure the correlation between scores and times are that good. I am collecting data and when I have enough I will try to evaluate how well the scores correlate with times.
1:14 am
drwho

How long will the hardest puzzle take? No one knows.
1:17 am
drwho

I guess the scoring system I have devised could in the worst case give a score of 6,480. But no puzzle has come close. The hardest was a 76, I think.
1:17 am
austinuu

is there any way that we can help in the data collection?
1:17 am
austinuu

like those people who post their start and end times
1:18 am
drwho

That's where I'm getting my data.
1:18 am
austinuu

well I thought that they were bragging. but now that I know it's for science, I'll start the practice
1:19 am
drwho

They didn't know I was keeping tabs on them :-).
1:23 am
bangping

The trouble is, those of us that multitask while working Sudokus would skew your data ;)
1:24 am
drwho

Naw, everyone will get their own correlation factor. I cannot mix your times with someone elses. We all get done in our own time. Some fast, some slow, like me.
1:24 am
austinuu

as well as those who are easily distracted. hey, you can make the tiles a bunny!
1:25 am
drwho

Easily distracted, or is that your kids distracting you?
1:26 am
austinuu

my kids had better be asleep. just for good measure I yelled not to make me go in there.
1:27 am
bangping

*grin* Ahh, the joys of parenthood ;)
1:27 am
bangping

The nice thing about all your kids being furry is, if they refuse to go to bed, you can lock 'em in a crate without anyone calling Child Protective Services ;)
1:28 am
austinuu

there's still animal control
1:28 am
bangping

They usually advocate crate training ;)
1:28 am
drwho

You haven't watched Animal Planet lately. The Animal Cops will be knocking on your door.
1:29 am
austinuu

who will give you a ticket for \$200 per pet if you don't have your vaccination records up to date
1:29 am
bangping

They'd see one house full of spoiled critters if they did! :) Generally, they crash long before I do, though. :) I've got critters firing sleep-vibes at me from all over the room currently....
1:29 am
austinuu

but that you can wave by taking a \$30 SPCA class
1:29 am
drwho

Is the giraffe in the back yard?
1:30 am
bangping

Heh, voice of experience, Austin?
1:30 am
bangping

Yeah. We wanted to keep him in the attic, but we couldn't figure out how to fit him in without making the roof leak...
1:30 am
austinuu

you know, people talk, you hear things.
1:31 am
austinuu

but I think my wife will be taking her responsibilities a little more seriously from now on
1:31 am
bangping

Heh
1:32 am
drwho

Bangping, I think you and my sister would get along fine.
1:32 am
bangping

I ran a rescue for a few years, and am still active in rescue, and my roommate's as nutty about critters as I am.
1:32 am
bangping

Between us, we have a houseful :)
1:34 am
drwho

My sister used to take in all the pet shop rejects when her friend was a manager there.
1:34 am
bangping

*nod* Not a job I could ever do
1:34 am
bangping

They'd fire me within 3 days ;)
1:34 am
bangping

If I lasted that long...
1:37 am
drwho

Do you have any experience rescuing bats?
1:38 am
bangping

Hmm, no :)
1:38 am
bangping

Never done wildlife rescue, only domestic critters :)
1:38 am
bangping

An iguana is about as wild as I've ever gotten.
1:38 am
drwho

Fascinating little guys, not rodents!
1:39 am
bangping

Dogs, cats, a guinea pig (I still have her), iguana, a parrot or two, some cockatiels, a ferret once
1:39 am
bangping

Yeah, I've always been fascinated by 'em :)
1:40 am
austinuu

done!
1:40 am
drwho

Currently, my sister only has a 3 legged cat. But she used to have a cripple cockatiel, a rabbit, a turtle and a dog too (at the same time).
1:41 am
bangping

Between us, my roomie and I have 5 cats, 4 dogs, and 3 guinea pigs.
1:41 am
bangping

2 humans - we've joked that we now just need a partridge in a pear tree :)
1:41 am
austinuu

there are lots of bats in the Austin area, as there is the largest Mexican free colony living under the Ann Richards Congress bridge
1:41 am
austinuu

and everyone knows not to touch
1:42 am
bangping

I've seen pictures of that colony, Austin - absolutely amazing stuff!
1:42 am
bangping

And I'm betting not a mosquito within a mile or two of there! ;)
1:43 am
austinuu

not as many, that
1:43 am
austinuu

not as many, that's for sure.
1:43 am
austinuu

well good night, and good luck
1:43 am
bangping

Goodnight :)
1:44 am
drwho

Good night. Time for me to turn in too.
1:44 am
bangping

Take care, Doc :)
1:44 am
bangping

Thanks for all you do :)
6:22 am
brittlefish.com

go
6:37 am
brittlefish.com

done
9:39 am
franebrown

no greens for me for a change
9:43 am
franebrown

today
10:24 am
bunnyvicious

go
10:28 am
redshoes

bunnybunnybunny
10:28 am
bunnyvicious

Howdy
10:28 am
redshoes

10:29 am
bunnyvicious

Home with two sick little bunnies, tummy bugs. Make for a happy day.
10:30 am
redshoes

awwwwww. *sends bunnies cinnamon toast & pedialyte* that's what my momma bunny gave me when I was sick.
10:33 am
bunnyvicious

About to take the twins to their half day at pre-K, won't be so bad then. They are bein' little buggers today! Cabin fever.
10:33 am
bunnyvicious

done
10:35 am
bunnyvicious

See ya later!
(You oughtta try babble sometime).
10:36 am
redshoes

k. will do. later bunny
12:54 pm
Minski

Done! Easy! Only one guess needed.
1:01 pm
RodeoRogue

go
1:13 pm
RodeoRogue

Done. No green. Petcar, don't overthink it.
3:27 pm
helenkeller

go
3:43 pm
helenkeller

done
3:49 pm
ypsigirl

DONE :)
5:23 pm
Stephanie

go
5:34 pm
Stephanie

done
8:37 pm
jawilke

done. skizzzyyyyy!!
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