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Comments on Puzzle #36108: window to the soul
By kaitlyn cyr (cyrious)

peek at solution       solve puzzle
  quality:   difficulty:   solvability: deep lookahead  

Puzzle Description Suppressed:Click below to view spoilers

#1: Web Paint-By-Number Robot (webpbn) on Nov 22, 2022

Found to be solvable with deep lookahead by valerie.
#2: Valerie Mates (valerie) on Nov 22, 2022 [SPOILER]
Comment Suppressed:Click below to view spoilers
#3: Valerie Mates (valerie) on Nov 22, 2022 [HINT]
Hm. To solve it, I did:

Line and color logic to solve blue, green, black, and some red.
Then I needed edge logic for the red at the top right.
Then all I could find was trial-and-error on the red 3 in column 14, followed by trial-and-error on the red 2 in column 19.

There is probably a better way to solve this! I called it deep lookahead but would be happy to be overruled by someone who can find a better way to solve it.
#4: Philip (Philip) on Nov 25, 2022 [HINT]
Here's how I solved it:
CL (solves blue and green and much red)
EL on right 3 in R1 (looking at R2): R1C15 is white
LL
EL on 3 in R20 (looking at R19): R19C15 is red
LL
EL on 2 in C13 (looking at C14): R17C13 is white, C14R17-18 are red
LL
EL on 3 in R11 (looking at R10): R10C17, R10C18, R10C20 are white
deep? moderate? lookahead: in R16, if C13 and C18 are white, then in R20 C13 and C18 are red, contradicting R20. So in R16 C16 and C20 are white.
LL
#5: Wombat (wombatilim) on Mar 15, 2023 [HINT]
I found the wording of Philip's last step to be a bit confusing, so I'm rephrasing here; it's still the same logic:

If the right 2 in R16 is not in C13-14, then R16 C18 will need to be red to avoid making R20 invalid. Therefore R16C16 and R16C20 must be white.

I think that's still enough steps to count as deep.

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