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## CHAT LOG for Saturday, January 20, 2007

3:03 am
h

ooph - that was hard for me - i needed greens from beginning to end. only filled in 1 square before resorting to greens. nothing seemed to "flow" till the end...
3:42 am
sprite

yeah, same here, stuck from the beginning. Greens help, though.
4:09 am
rycaut

done with no checkpoints or greens
5:55 am
eyeman

done with checkpoints and green!
7:32 am

Started fast, got bogged down and had to dig myself out with greens. Oh well, on to the archives......
7:33 am
franebrown

same here.got just one # before entering the greens and am still at it
8:21 am
drwho

Difficulty score 27. This is an exercise in region intersection analysis and cross hatching.
8:22 am
drwho

If you are doing it without greens, look for some naked pairs.
8:29 am

Good morning Doc, do you have any tips on how to spot naked pairs without using greens?
8:30 am
drwho

Sure, cross hatching often limits 2 digits to the same 2 cells.
8:33 am

So it's just a matter of being able to visualize and remember to results of cross hatching in my mind. Too bad my memory is so poor.
8:34 am
drwho

Perhaps it's not so much memory as pattern recognition.
8:36 am

Good point. I should continue to get better with practice.
8:36 am
drwho

Indeed, and your memory should improve too :-).
8:37 am

It can't get much worse!
8:41 am
drwho

Hint on cross hatching. It is much easier than you may think to do it mentally.
8:42 am
drwho

Just observe that the top 3 rows and the top 3 blocks enclose the exact same set of cells.
8:42 am
gman

morning doc; what's the difference between scanning and cross hatching??
8:43 am
drwho

That means that the digit 1, for instance, can only appear once in each of the 3 rows and each of the 3 blocks.
8:43 am
drwho

If 2 of the 1s are filled in, you already have the missing 1 limited to no more than 3 cells.
8:44 am
drwho

Good morning gman.
8:46 am
drwho

For instance, if there is a 1 in the 2nd cell from the left in the 1st row and a 1 in the 5th cell from the left in the 2nd row, then there must be a 1 in the 7th, 8th or 9th cell of the 3rd row.
8:47 am
drwho

gman, how are those Colts doing?
8:47 am
gman

sorry doc: I haven't had my coffee yet. Todays medium, I was only able to scan (or cross hatch) a 5 and a 1 before resorting to greens (ploddding sort of solution).
8:48 am
gman

I have all my friends coming over for a playoff party on Sunday. I live in Indy but grew up in Chigo so our fingers are crossed.
8:49 am
drwho

That sounds like how I got started too.
8:49 am
drwho

I lived in Plainfield, just 30 miles from Chicago for many years.
8:50 am
gman

OK Bears and Colts in Miami would be wonderful!!! :-)
8:51 am
drwho

I'm a Vikings fan now. Which probably explains why I don't follow football much.
8:52 am
gman

Also, My wife's from Joliet so we get near Plainfield on occasion. Smal world!
8:55 am
drwho

Yes, Joliet is right next to Plainfield, getting closer all the time, so I'm told.
8:59 am
drwho

I missed the question about scanning and cross hatching. I follow the Wikipedia article on that. Cross hatching is a scanning technique. Any technique that actually reveals the location of a digit is considered scanning, everything else is analysis.
9:03 am
gman

Thanx, this is an interesting Medium. I used a naked Quad in row 6 and a naked Quint in column five. Cool but maybe it was easier than I'm making it. That coffee might help!
9:06 am
drwho

Maybe you should switch to decaf!
9:13 am
gman

Finally got it. That had a little everything except a force. On to the archives. Can't have the doc catching me!! Hee Hee.
9:37 am
chrissie2006

Ive been staring at this puzzle for 20 minutes and have filled two squares. im thinking my level of sobriety may have smtg to do with it
9:39 am
gman

chrissie2006--that's how this one goes. Probably a 5 and a 1?? Take a look at drwho's and my chat on this one over the last few minutes. It might help.
9:58 am
chrissie2006

lol, your right it is a 5 and 1. i havnt been trying all that hard though
9:59 am
chrissie2006

still feeling it from last night
10:02 am
grama

Is drwho still about? I was born in Joliet.
10:03 am
hurshy

on a cold december morning?
10:13 am
brittlefish.com

go
10:15 am
drwho

Grama, did you grow up in Joliet or get out quick?
10:21 am
brittlefish.com

this is a slow one, huh?
10:25 am

Hey b-fish, it's a good medium. I needed greens pretty quick. The good doctor has been trying to teach me how to visualize naked pairs in my head, so I'm doing it again.
10:26 am
brittlefish.com

it's coming along without greens so far, but it took awhile to get the first half dozen #s. just cross hatching and scanning at the moment
10:27 am

That's pretty good. I could only get two 1's and two 5's that way.
10:28 am
brittlefish.com

you can get two or three more pretty quick by switching your scan tactic at that point
10:29 am

AHA! A lone 7 in a cell! Yes...
10:32 am

That gave me another 7 and led to three 6's.
10:33 am
brittlefish.com

i have 17 #s but am still switching tactics to get one or two then back to something else. this is an interesting pzl
10:34 am
denny

Took a while to warm up but quite easy once got going.
10:36 am

I'm stuck at 13 #s
10:36 am
brittlefish.com

just messed up somewhere, erasing slowly
10:39 am

15 now, a couple of 4's
10:43 am
brittlefish.com

now we're cookin
10:44 am

I agree. 3's and 9's and off to the races.....
10:47 am
brittlefish.com

and done. that was fun.
10:48 am

I'm stuck again.
10:48 am
brittlefish.com

34 min. yikes. no greens or fancy stuff, just wandering around scanning and xhatching
10:48 am
brittlefish.com

how many #s eagle?
10:48 am

22
10:50 am

Here we go, found a 2 that I needed..
10:51 am
brittlefish.com

scan rows, cols, & boxes. i guess i have been "visualizing" naked pairs... so to speak. did the dr get you going with that okay?
10:52 am

I think so, it seems slow to me. Practice, practice, practice...
10:55 am

Done. That was a tough one without greens.
10:58 am
brittlefish.com

i find that if i'm scanning a 3x3 box, for example, "1s can go here, 2s here, 5s in these corners, etc." i look for either (a) # can only go here, (b) # can only go in 2 spots, (c) # goes in 3 or more. if (b) then i look for another # that only goes in the same spot (naked pair, then rescan the box knowing the pair is now taken), AND see what that pair does to scans outside that 3x3 box, since it will "point" one direction or another.
10:59 am
grama

drwho, if you're still here....sorry I had a phone call. I sort of grew up there. I'm not done yet.
10:59 am

That makes sense, but I have trouble remembering the results for more than a couple of cells.
11:02 am
brittlefish.com

practice helps, but i have a hard time remembering once i leave that box, row, or col scan. lots of mental rework.
11:03 am
brittlefish.com

start with boxes, rows, cols that have 3 or 4 opens, then work up to 5, 6...
11:05 am

My wife says I have CRS disease (Can't Remember S***) so this mental exercise might help.
11:38 am
Zugzug7

I know I have CRS. This puzzle is called self-help.
11:57 am
UDbmas

Oh... thanks... I was wondering what "SuDoku" meant... LOL
11:58 am

Mt wife used to say it meant "waste of time". Now I can tell her it means "therapy"
12:09 pm
Minski

Done! Only one guess!
12:27 pm
drwho

Grama, I went to Plainfield High School. But I still haven't grown up :-).
4:18 pm
btwrt

that was fairly easy ...
4:47 pm
austinuu

for science, go!
5:15 pm
austinuu

congratulations!
5:42 pm
helenkeller

go
6:01 pm
mamabear

hi helen!
6:04 pm
helenkeller

done
6:06 pm
helenkeller

hiya mama - sorry - didn't see you there
6:07 pm
helenkeller

how've ya been, mama?
6:07 pm
mamabear

not so good - my MIL is very very ill
6:10 pm
helenkeller

what's wrong?
9:39 pm
Hyde

this is just weird, I can finish experts but this medium is confusing the hell out of me
10:38 pm
bunnyvicious

go
10:49 pm
bunnyvicious

done
11:44 pm
smooth_pappa

done
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