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Old 02-14-2015, 06:24 PM   #6
Talon87's Avatar
Join Date: Mar 2007
Location: Lafayette, Indiana
Posts: 20,548
Got it in 20 seconds. My approach, in my own words:

Spoiler: show
It works with both rows and columns:
  • the property that 1 and 2 share will be inverted in 3
  • the property that 1 and 2 do not share will see 3 copying 2's
So like, if it's bottom left, bottom right, then you know the third square must be top right since bottom was shared (so invert it) but right-left ness wasn't (so go with the second square's, which was right in this example).

Looking over your guys' discussion it looks like you had similar approaches.

Maybe we need another example!
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