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## CHAT LOG for Tuesday, October 19, 2010

12:53 am
eyeman

Pretty easy with one green. Done.
1:15 am
Fizzbut

go
1:56 am
MrOoijer

Guessed. Hello and Goodbye.
2:03 am
Fizzbut

done ng
2:03 am
Fizzbut

done ng
5:27 am
Andy

done. used greens. And a guess.
5:53 am
kaosangel

Morning. Go.
6:06 am
kaosangel

Done. No Greens.
6:45 am
tincup

Done... A little more challenging today
6:47 am
GreyDragon

Go!
7:22 am
Ed-was_here

Go
7:36 am
Phil

start
7:39 am
Ed-was_here

Done with greens
7:58 am
gman

15 filled w/ greens; have to guess
8:02 am
Phil

done, no greens but second guess
8:03 am
Inge

done, ditto Andy!
8:04 am
gman

ditto Inge; 16 was most to get logically w/out guessing
9:13 am
drwho

Difficulty score 51. No green.
9:34 am
drwho

Like gman, I found 16 no problem. Then instead of guessing, I found a logical impossibility (start with an assumption and show that it leads to a duplicate digit in one of the rows, columns or blocks and hence the assumption is incorrect). I found 2 digits that way and then everything fell into place. Sounds almost the same as guessing, except I was looking ahead instead of filling in the grid until I got into trouble.
11:27 am
jackt

I solve using only logic. What's the point of guessing? Any chimpanzee can guess and will eventually stumble upon the correct solution, oo-oo-o-o-ah-ah-ee-ee. What about the dng part? Well, good on ya if you can solve logically and use no greens, but if you use reds then you're lying by omission. Occasionally I need greens because my brain's tired. I'm as old as dirt. There's no shame in greens. The young brains can do the greens by rote, committing them to memory. Technically they still use them, they just don't write them down, LOL.
11:30 am
jackt

BTW I solved this rather quickly using logic and I didn't need any difficult techniques. Couple of pointing pairs and it cracked like an egg.
11:36 am
drwho

Jackt: the puzzle is an expert. That means it requires the application of 1 or more techniques more advanced than pointing pairs to solve by logic. You may have found a correct solution by incorrect logic if pointing pairs were the most advanced technique you used.
12:06 pm
sandbox74

commence *gulp*
12:33 pm
sandbox74

I found the 16.. so greening up
12:55 pm
sandbox74

terminate.. used one guess. back to the sudoku solver to see how I should've solved this without guessing...
2:56 pm
K M

finished ... one guess was all it took ... fun puzzle
5:40 pm
Prinise

done, no greens
6:09 pm
Doll414

go
6:20 pm
Gretchen

Couldn't do it with pointing pairs - have always used that technique but never knew it was called that so had to look it up - used a guess and greens
6:35 pm
Doll414

done, ng
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