Puzzle Description Suppressed:Click below to view spoilers

#1: derby (Derby) on Nov 18, 2019

Surprised to see that this puzzle required a deep look ahead because I found it to be conventionally solveable. I guess that shows you haw things have changed since the early puzzles.

Initial line & color logic gets to 63%. Red and green are complete, blue has only 2 unsolved squares.

R3: If the rightmost black 2 is in C45-46, it doesn't leave anywhere for the second to last black 1 in R7 to go. Therefore R3 C37-38 is black instead. LL.

C25: Whether the second to last black 1 is in R27 or R28, the 2 after the 4 in R27 will be placed in C31-32. LL.

R28: If C48 is black, it creates a contradiction in R27, so this square is white.
R27: If C48 is black, it creates a contradiction in R26, so this square is white. LL.

C18: If the black 3 goes into R22, it marks R22 and R25-26 in C19 white, which forces R25C20 to be white, and now there is nowhere for the black 1 after the red 5 in R26. Therefore R25C18 is black instead. LL.

I'm struggling to find anything conclusive from here. I'll give this one another look later.

Derby - This puzzle is actually from 2015, so it's kind of medium-aged. When the system can't tell if a puzzle is solvable, it takes the consensus of what people have selected and lists that as its solvability. Later, if someone officially sets the solvability, that overrides the consensus. This puzzle is one where the system hasn't determined its solvability and nobody has officially set it, so the system is showing the consensus of what people have selected. (That made sense, right?)

Show: Spoilers

Goto next topic

You must register and log in to be able to participate in this discussion.