Puzzle Description:

The original incandescent lightbulb is worth a lot of money...

#1: David Bouldin (dbouldin) on Feb 14, 2013 [HINT]

great solve! used mostly edge logic and a couple of 2-way moves. not sure how much was necessary. that red question mark should disappear eventually.

I guess they hadn't perfected their glassblowing yet. ;)

See puzzles # 518, 1364, 6768, 10888, 18273, 18348, 19857...

Good one Tom.:)

Sorry, Kristen... Was bored with no B&W and had to make a couple... My skin is in the solving, not so much the artwork.

I wasn't able to find a "moderate lookahead" solution for this. If there are simpler solution methods, then they aren't simple to find.

Found to be solvable with deep lookahead by jan.

I used edge logic to solve the 13 in R1, then later the 5 in C1. The rest solved by line logic.

I guess you can call it two-way logic, to place the 5 so it lines up with the 2s and 3s on either side.

There is no way to solve the 5 completely with logic. I had to guess.

here's a path...after LL (and assume LL between these steps):

- EL in C20 dots C20R1,2,13-20
- EL in C1 dots C1R1-5,13-20
- EL in C19 dots C19R17-20
- EL in C2 dots C2R1,2,7,14,15,20
- EL in C3 dots C3R1,2

(not sure if all of that is necessary, but wanted to exhaust it :P)

- either C14R15 or C15R15 has to be a dot. this blacks C14,15R17 and C14R18

LL to finish

When there's a largish number in the first row and two small numbers in the second row, I look for edge logic right away.

ayup

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