I agree that process of elimination is often a key part of logic or logic puzzles. I just don’t see how by itself that would constitute a logic puzzle.
Here is what I would mean by a logic puzzle, I’ve posted this before but it was a long time ago and I can’t remember where or when. The surprise quiz problem:
On Friday near the end of class the Philosophy professor tells the class there will be a surprize quiz sometime next week, so they should study this weekend to make sure they are ready. One student raises his hand and says “well we know it can’t be on Friday, since if we haven’t had it by Thursday at the end of class it would mean it’s going to be on Friday, in which case it won’t be a surprise.” The professor agrees with that and says ok sure it can’t be on Friday or else it wouldn’t be a surprise, you’re right. But then the same student says “but for that same reason it can’t be on Thursday either, since if it’s Wednesday at the end of class and we haven’t had the surprise quiz yet, and we know it can’t be on Friday, then we know it must be tomrrow on Thursday. So it wouldn’t be a surprise, we could just study Wednesday night.” The professor reluctantly agrees. Then the student repeats this same argument to eliminate Wednesday, Tuesday and Monday as possible dates for a surprise quiz. Confident that there will be no surprise quiz next week after having logically eliminated all possible days in the week, the student goes home and doesn’t bother to study. Then on Wednesday next week, the professor begins the class by saying “Surprise! Quiz time.”
So where is the fault in the student’s logic?