Getting Unfamiliar: Violinists

[AnnaT620]

I've looked through the Logic Games Forum and can't find anything related to the Getting Unfamiliar game on the violinists (as set out on pg 372 of the Strategy Guide).

For question number 3, I understand the explanation provided in theory on the placeholder for H/U - and acknowledge that one of these must be in - but just want to be clear on why, when looking at the logic chain as a whole.

If U is in the H is out. If H is out then M, W and L are out. And we can also choose to put G out, as this is not triggered.

Likewise, if H is in then M, W and L are also out. And we can choose to put G out here too, as this is also not triggered.

My understanding is that U or H being in doesn't trigger anything - and as there are no further rules. We could even choose to have both U and H selected.

How do you make sure you don't go backwards on any of the rules / or when you've got the finished T Chart, how do you check you haven't reversed any of the conditional statements?

[Misti Duvall]

Hi Anna!

I think you may have the H/U rule reversed. It says that if U is OUT, then H is IN, which would be - U --> H. One way to think about this is to look at the rule and its contrapositive stacked together:

- U --> H
- H --> U

If U is out, it pushes H in; if H is out, it pushes U in. So H and U can never be out at the same time, cause every time one is out it pushes the other in. And if H and U can never be out at the same time, that means one of them must always be in.

It can be tricky to keep track of rules with the logic chain, and it might help to practice conditional logic notation a bit before going back to it. That can help make diagramming easier and faster, so when you use the logic chain it's easier to avoid things like reversing rules. You can also try writing out the rule before putting it into the diagram.

Hope this helps!