Puzzle Description:

(This puzzle was recovered from the 2016 database crash. Description not available.)

#1: Eric (kelalatir) on Oct 9, 2020 [HINT]       classify

This puzzle is excellent, a most wonderful picture!

I was able to solve it logically, with moderate lookahead. LL and color logic take you most of the way. Near the end, I had to use an if-then type logic, which felt like end-color logic.

In row 12, the blue pixels on either end can only go in columns 1 or 2 and 19 or 20. If you put the blue pixel in R12C1, then with moderate lookahead R13C2 causes a contradiction. The same thing occurs on the other side. If the blue pixel is placed in R12C20, then R13C19 cannot be blue, black, or a dot/white.

The puzzle then solves with line and color logic.

The is a totally excellent puzzle. I, also, solved it logically but had to work at it which made it VERY enjoyable!! Thanks for the great puzzle!!

The hint in #1 is sound, but it's only needed in C1-2. The C19-20 blue can be placed with color logic.

Found to have a unique solution by wombatilim.

Found to be solvable with moderate lookahead by wombatilim.

That is an amazing picture!

I got to 88% with line and color logic, so I was hoping I could solve the whole puzzle that way. But it did indeed need lookahead to finish.

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