Puzzle Description:

They are here all Winter, and we set out feeders

#1: Tom King (sgusa) on Dec 14, 2011 [SPOILER]

http://www.google.com/imgres?q=hummingbirds&hl=en&sa=X&rlz=1R2GZGN_enUS433&biw=1344&bih=554&tbm=isch&prmd=imvns&tbnid=FnpUjAJq5YOkHM:&imgrefurl=http://www.imagegossips.com/2011/07/fun-facts-about-hummingbirds/&docid=kae0rjuLguCdYM&imgurl=http://www.imagegossips.com/wp-content/uploads/2011/07/29.jpg&w=400&h=259&ei=hoXpTrbzBcKSiAKEjMG0BA&zoom=1&iact=hc&vpx=583&vpy=258&dur=7076&hovh=181&hovw=279&tx=139&ty=147&sig=114406723769828089623&page=19&tbnh=144&tbnw=192&start=194&ndsp=11&ved=1t:429,r:2,s:194

Nathan inspired this puzzle with his recent one.

There is a lot of edge logic and internal/extended edge logic. I never got more than two moves ahead. I know the solution, and it wasn't easy. Another red ? ...

I like your bird Tom,hmmmmmmm.:)

Wow, I did NOT see a hummingbird at a feeder until I read the description. Then it popped right out. :)

I used a lot of logical guesses on this one, but I'm not sure that really counts.

I'll wait for the experts ... I might have looked ahead ...

New version published by sgusa.

I edited it. I solved it last night, but had tweaked it so many times, I couldn't solve it today. I added a pixel and solved it. Hopefully, you'll give it another shot.

initial line logic (then line logic after each step when possible)
edge logic on the 3 clue in c20 (dots in r1-3);
the 5 and 6 in c17-18 cant both go into r14 so no matter which one goes up into either r8 or r9 (they both may go up) so r9c20 is always a dot;
edge logic on the 5 clue in c11 (dots in r1-5);
edge logic on the 5 clue in c1 (dots in r1-4, black in r9);
edge logic on the first 2 clue in r1 (dot c2)
edge logic on the last 2 clue in r1 (dot c10)
internal edge logic on the 5 clue in r4 (dot c2-3, 10-11, and completely placing the 5)
line logic to finish

no guessing

All logic, no guessing, no hints. I had a fun time doing it too.

Didn't see the image at all until I read the description, then it was extremely obvious.

excellent image!

some of the same logic as bugaboo...these were my only non-line-logic moves (done in this order):

EL 6 in C20 to black C20R12,13
EL 5 in R4 to dot C1-3,11R4
EL first 2 in C2 to dot C2R1

Found to be solvable with moderate lookahead by gator.

David's is a short way to get to the end. (I have one slight quibble - the EL 5 in R4 can only dot C1-2, not 1-3. But that's OK as you can still get to his next step without that extra dot.)


My solve involved a little more advanced logic. Here are my steps if anyone wants to decode them.
el6c20=[r11-17]so(r12-15k)
del5c11=r1-4w[vsc9]
del5c1=r1-4w[vsc3]
el2c2=r1w
el5r4=c2-3w

Goto next topic

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