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## CHAT LOG for Saturday, January 6, 2007

12:19 am
Zoor

go
12:19 am
Zoor

done
12:44 am
WHB

Done
1:07 am
Denise

What's up with Zoor?
1:17 am
drwho

Difficulty score 30. Cross hatching and region intersection analysis required to solve this one.
9:27 am
Linda

done - easier than yesterday's easy!
9:30 am
chrissie2006

Im pretty sure that a lot of the methods you all talkk about, I use, but I have no idea what they are called
9:31 am
chrissie2006

cross hatching i can figure out, but i have no idea what region intersection analysis is
9:32 am
UDbmas

ditto... I just go through the same sequnce every time to fill in what I can... I think the 4 things I do first fall into what seems to be called "scanning"
9:33 am
UDbmas

And I think I know what "naked pairs" and "naked triplets" are
9:34 am
chrissie2006

I don't... :)
9:36 am
UDbmas

if you use "greens" look for two squares that have only 2 possible numbers, then look at the squares that are in the same row, column or block to see if there is a second square that has the same 2 only possible numbers. I think that is a "naked pair" and triplets are the same, only there are 3 possible numbers
9:37 am
UDbmas

If you find a naked set, then all other squares in that row, column or block cannot be those 2 (or 3) numbers, so you can erase those greens.
9:41 am
brittlefish.com

go
9:42 am
chrissie2006

oh ok, Yeah I do use that too, just never had a name for it
9:44 am
UDbmas

I have no clue about some of the others, even after I go to a site that explains it...like x-wing or y-wing... :-|
9:44 am
chrissie2006

I havnt even heard of those
9:44 am
UDbmas

PS: Hi Canada!
9:46 am
brittlefish.com

http://www.brainbashers.com/sudokuxywing.asp
9:48 am
brittlefish.com

xy wing is pretty simple if you can find them
9:50 am
UDbmas

That's about when my brain starts leaking out through my nose...
9:50 am
brittlefish.com

:)
9:53 am
UDbmas

done... take care all & have a good one...
9:54 am
brittlefish.com

see ya
10:03 am
brittlefish.com

done
10:03 am
brittlefish.com

kind of a slow medium
10:26 am
btwrt

took me 20 minutes or so. not bad :D
12:46 pm
yul

btwrt! happy new year
12:57 pm
gman

drwho -- guess who's hot and right behind you in ranking??! OK, don't take it personnal; hee, hee! I know you can use your programming skill to get to 600 overnight. overnight.
2:09 pm
helenkeller

go
2:21 pm
helenkeller

done
2:31 pm
Stephanie

go
2:45 pm
Stephanie

done
3:09 pm
drwho

chrissie2006 -- region intersection analysis is a little more general than what UDbmas describes. It is a generalization of the pointing pair and box/line reduction techniques described at scanraid.com.
3:11 pm
drwho

If you focus on the intersection of a 3x3 block and an line or column, the 3 cells they have in common are significant. If a digit is limited to those 3 square or any 2 of the 3 in the row, then it must be limited to the same 2 or 3 squares in the block and vice-versa.
3:14 pm
happyhammer1982

go
3:14 pm
drwho

gman -- I hear the sound of hooves and heavy breathing.
3:14 pm
happyhammer1982

go
3:14 pm
happyhammer1982

go
3:14 pm
happyhammer1982

go

3:14 pm
happyhammer1982

go

3:27 pm
aki2403

done :D
3:28 pm
aki2403

6 points away from being in the regulars end of next week if my calculations are right *dances*
8:28 pm
Minski

Done! Not too awfully difficult.
11:06 pm
gman

drwho -- Those hooves you hear are from my Indpls Colts
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