The rule that stipulates "Grace helps move the sofa if, but only if, Heather helps move the recliner" (Rule #1) is confusing me.
I'm not sure why this translates into a doublearrow... Why isn't it simply a single directional conditional arrow like the second rule? Also, will all "if, and only if" sentencing structures predicate the double arrow?
Thanks, Joe
Setup and Rule Diagrams
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Hey Joe,
Good questionthe phrase "if but only if" is confusing for many students. In fact, I just recently wrote a blog post about this very issue (see http://blog.powerscore.com/lsat/bid/261 ... utonlyif). As it turns out, "if but only if" is equivalent to "if and only if." Consider, for example, the rule "A will go if and only if B goes" This rule could also be phrased "A will go if but only if B goes" Regardless which phrasing is chosen, we yield two basic rules: A will go if B goes; A will go only if B goes. Including diagrams, it becomes clear that this leads to the doublenot arrow: A will go if B goes (B A) A will go only if B goes (A B) Together the two rules yield the double arrow relationship: A B I hope that's helpfulplease let me know whether this clears up this challenging conditional issuethanks! ~Steve Steve Stein
PowerScore Test Preparation
That clears it up. Thanks!
Hi PowerScore,
The explanation for this game makes reference to the Overlap Principle. I am taking the online full course and looking for help in locating the discussion of the OP in the lecture materials. Thanks, Nadia
Hi Nadia,
Thanks for the question. It’s in Lesson 4 Homework, on pages 428 and 429. Thanks! Dave Killoran
PowerScore Test Preparation Follow me on Twitter at http://twitter.com/DaveKilloran My LSAT Articles: http://blog.powerscore.com/lsat/author/davekilloran PowerScore PodCast: http://www.powerscore.com/lsat/podcast/
Thank you Dave!
Seriously  you guys and gals rock. Thanks so much for the (always) quick responses! Nadia
Thanks Nadia! We're always glad to help out
Dave Killoran
PowerScore Test Preparation Follow me on Twitter at http://twitter.com/DaveKilloran My LSAT Articles: http://blog.powerscore.com/lsat/author/davekilloran PowerScore PodCast: http://www.powerscore.com/lsat/podcast/
Any way someone could post a full setup and diagram?
Hi, Eveitch,
This game is pretty openended (i.e. not very deduction heavy), but a baseline setup could look like the following: I hope this helps!
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