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Comments on Puzzle #20408: Upsie downsie 4
By Tom O'Connell (sensei69)

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

Puzzle Description Suppressed:Click below to view spoilers

#1: Norma Dee (norm0908) on Nov 18, 2012

Weight lifter with two heads?
#2: Adam Nielson (monkeyboy) on Nov 18, 2012 [SPOILER]
Comment Suppressed:Click below to view spoilers
#3: Tom O'Connell (sensei69) on Nov 18, 2012
yrqw Adam
#4: Web Paint-By-Number Robot (webpbn) on Oct 27, 2019
Found to be solvable with deep lookahead by infrapinklizzard.
#5: Joe (infrapinklizzard) on Oct 27, 2019 [HINT]
I do not see a moderate lookahead solution to this one.

After LL, we end up with 5pixels +1blot left in both the horizontal and vertical directions.

Everything I see now chases around the rest of the puzzle for at least three steps.

E.G. if the 3 in r2 were in c9-11, then
> r2c12-13 are white
> So c12r4 and c13r6 are black
> So r4c18 and r6c20 are white
> So c18r8 and c20r8 are black
= which is a conflict with the 2 clue in r8. So r2c9 must be white

Then LL to finish.
#6: David Bouldin (dbouldin) on May 26, 2020 [HINT]
or you could solve it like i did joe...after line logic i messed up the logic in my head for summing with blots and dotted C9R2 without sound reason. then it's just line logic to finish. see? much less lookahead.

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