Puzzle Description:

(This puzzle was recovered from the 2016 database crash. Puzzle creators, please edit this puzzle and put the real description here!)

#1: Jota (jota) on Jun 12, 2019

Thanks for entry, but I needed look ahead!

I think I've run out of color logic at 6% but I'm not completely certain. I've placed a few red and blue squares, but no black.

R1: EL puts the black 3 in C6-8. Resulting line & color logic gets to 91% complete, with the black finished. Red and blue still remain.

R19: Wherever the red 2 is placed, R20C22 is white. L&CL.
C20: Whichever way the red 2 goes, R19C21 is red. L&CL.

R24: If the red 2 goes into C23, there is no valid way to complete R20-22 C24-25. Therefore it goes into C25 instead. L&CL finishes the red.

Not currently seeing a viable path forward for the remaining blue. I'll revisit later.

Enjoyable puzzle.

From where I left off:

Deep lookahead R18: If the blue 2 goes into C18, R22 C16-17 will need to be blue, and R21-25 C18 are white. The blue 2 in C16 would need to go into either R21 or R23, either one of which would make R23C17 blue, which means it would be R23C16 that is blue as well. This leaves nowhere for the 1 in R21 to go, so R18C16 must be blue instead. LL.

C17: Wherever the blue 2 goes, R22C18 is blue.

LL to finish.

Found to be solvable with deep lookahead by wombatilim.

Found to have a unique solution by wombatilim.

Goto next topic

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