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CHAT LOG for Thursday, May 22, 2008

12:15 am
trueheart11

go
1:00 am
trueheart11

done. no greens
2:39 am
eyeman

Done with a red, so back to bed.
4:00 am
Phil

start
4:19 am
kixx

go
4:37 am
Phil

done with greens
5:00 am
kixx

done with greens
5:34 am
Andy

go
5:51 am
Andy

done
5:55 am
franebrown

greens plus 2 guesses and finally done
7:22 am
brittlefish.com

go
7:45 am
brittlefish.com

dang. off to work. restart later.
9:03 am
yul

hello everybody
9:12 am
Fizzbut

done, no greens but one "educated" guess.
9:54 am
drwho

Difficulty score 73. With green I didn't find it that difficult.
9:55 am
yul

hello drwho
9:56 am
drwho

Hello yul.
9:56 am
yul

do you ever use chains in your sudoku solving?
9:57 am
drwho

Yes. I used 2 on this one.
9:59 am
yul

do you have a favorite sudoku solving/explanation site?
10:00 am
drwho

Mine :). But it only covers the basics. www.scanraid.com is a good one.
10:02 am
drwho

The best advanced technique I have learned is called an alternating inference chain. The scanraid site has a link to a rather abstract description of it, but if you can wade through it, it's worth it.
10:03 am
yul

yes. it's the one I am interested in.
10:04 am
yul

I wish they would show several examples of 1 technique so I could start seing this pattern without struggle.
10:05 am
yul

that would be the best way of [learning for me]. Thank you v much drwho.
10:06 am
Sulihin

when i'm stumped on experts i usually end up seeing what the scanraid solver does with it
10:08 am
yul

Yes. this site looks like the most intelligible one. I have to have a closer inspection
10:09 am

Brainbashers is another good site: http://www.brainbashers.com/sudokuhelp.asp
10:09 am
drwho

AIC starts with a hypothesis. A certain cell cannot contain a certain digit. from that you can deduce that another (or the same) digit must go in another cell (or cells). Repeat those 2 steps until you find a cell or cells that must be the same digit the original cell could not be. Then you know that all cells that are buddies with the original cell and the final cell cannot contain the original digit.
10:11 am
drwho

I just looked at Scanraid and he has reorganized. I think he eliminated the link to the AIC explanation and is planning to provide his own. But it's not there yet.
10:13 am
yul

OK
10:16 am
yul

Thanks everybody.
10:17 am
drwho

AIC is a series of deductions. Starting with the hypothesis that something cannot be, leads to the deduction that something else must be. That in turn leads to another deduction that something cannot be and then to something else must be. Always start with what if this cannot be and always end with then this must be. If you're lucky it leads to useful information.
10:18 am
yul

Todays' wasn't bad with greens and 2 short chains.
10:20 am
yul

All sudoku deductions are exclusions so I am used to this way of thinking by now.
10:20 am
yul

Have a good day everybody.
10:28 am
RodeoRogue

go
10:33 am

Greens + 1 Guess :(
11:54 am
sandbox74

commence
12:13 pm
sandbox74

going green
1:16 pm
sandbox74

arghh.. had to guess once as well... bah humbug
1:30 pm
meather

go
3:20 pm
Kiran

done with greens..
3:20 pm
Kiran

done with greens..
3:43 pm
Inge

done with greens
4:09 pm
BoredByPolitics

done with greens, and finding 2 triples
4:33 pm
smooth_pappa

start
4:37 pm
brittlefish.com

continue
4:38 pm
smooth_pappa

hey brittle... we meet again :)
4:38 pm
brittlefish.com

must have the same schedules... :)
4:38 pm
smooth_pappa

lol what time zone are you in?
4:38 pm
brittlefish.com

est
4:39 pm
smooth_pappa

ahhh... central here... so almost the same schedule
4:40 pm
brittlefish.com

same schedule... i just live on central in my mind i guess. spent most of the 90s in texas... maybe that explains it. (or i just get up late :)
4:40 pm
smooth_pappa

heh... I thought I got up early
4:41 pm
brittlefish.com

this one is giving me fits but it feels like it shouldn't
4:41 pm
smooth_pappa

I got a fewright off the bat, but it's really slowed down for me
4:44 pm
smooth_pappa

but I'm slowly chipping away at it
4:45 pm
brittlefish.com

i got 19 but have been stuck since this am
4:45 pm
smooth_pappa

I'm at 20 at the moment. but I feel I may have to resort to greens shortly
4:45 pm
brittlefish.com

yeah - i miscounted. 20.
4:52 pm
smooth_pappa

man! this is taking a LOT of concentration
4:53 pm
brittlefish.com

i know. my skull is about to crack open.
4:59 pm
smooth_pappa

27, still no greens... yet
4:59 pm
brittlefish.com

wow. great. i got 22 with auto g+r, and a guess. :(
5:00 pm
ypsigirl

this is like my third time starting over.. ugh
5:01 pm
smooth_pappa

this puzzle IS frustrating! I mean, I've gota majority of it filled in. it's to a point where with other puzzles, the only thing left would be to fill in the remaining numbers. but not on this puzzle. I have a feeling it's going to make me work for every last number
5:01 pm
smooth_pappa

hey ypsi!
5:02 pm
smooth_pappa

hold that thought... found a hole
5:02 pm
brittlefish.com

you'll be sitting there scratching your head, wondering, "if i could only get that one last number..." :)
5:02 pm
ypsigirl

I may need to come back to this after tee ball practice for the kids.....
5:03 pm
smooth_pappa

hehehehe... that would be classic, brittle
5:03 pm
smooth_pappa

DONE!!!!!! no greens. I did make a wrong guess in the middle, though.
5:04 pm
smooth_pappa

once you get to the last 5 or 6 numbers, it's a breeze ;)
5:04 pm
ypsigirl

gee that is promising... great job papa
5:04 pm
brittlefish.com

whoa. impressive. any technique hints? chaining, xy-wings, tie fighters, ???
5:05 pm
smooth_pappa

thanks ypsi! techniques? um... think really really hard! stare at it... lol I probably use techniques, but wouldn't know how to name them or describe them
5:05 pm
smooth_pappa

oh! and swearing at the computer apparently helps a lot :)
5:06 pm
brittlefish.com

ahhh, my mistake. \$&@^^##!
5:06 pm
smooth_pappa

hehehe... well, I'm off... good luck guys! you can do it!
5:06 pm
brittlefish.com

see ya. and congrats!
5:07 pm
ypsigirl

#\$@! it is not really helping... :)
5:07 pm
ypsigirl

bbl
5:08 pm
brittlefish.com

nope. i got nothing from it either. see ya round.
5:17 pm
brittlefish.com

done. auto g+r. seventy bazillion checkpoints and umpteen good and bad guesses. after that it was easy. ... except that one last number was really tough.
6:16 pm

start
10:00 pm
UnikeTheHunter

Go. Probably a long time till I finish.
10:02 pm
helenkeller

go
10:38 pm
helenkeller

finally, with greens
11:03 pm
UnikeTheHunter

19. Stuck. Going to call it a day soon.
11:42 pm
UnikeTheHunter