Puzzle Description:

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

#1: Jota (jota) on Dec 21, 2019       classify

Interesting ...

This was in may saved puzzles list. I've exhausted initial line & color logic, and at 89% with only black remaining. I don't have any notes on this one, so I don't *think* I've done any moderate lookahead to get to this point, but I'm not 100% certain.

C10: If we put the remaining clues in R16-17 and R19, R12 C12-13 and C16-17 are black, R16 C11-12 are black, and R19 C11-12 are black. C15 would need to place blacks in R17 and R19, but this would make R19 invalid. Therefore R12-13 C10 must be black instead. LL.

C16: We can use the same logic as the previous step to determine R12-13 are black. LL.

R17: If C12 is black, R16C11 would need to be black, which makes R16 invalid.

LL. There's several LL spots that the hint button doesn't catch, so take care. This gets the puzzle to 97% complete.

R22: EL marks C32-33 and C39-40 white.

LL to finish.

Found to have a unique solution by wombatilim.

Found to be solvable with moderate lookahead by wombatilim.

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