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"You should use an opposed check when a task involves directly opposing the task that another character performs"

Shouldn't Arm Wrestling be an opposed check and not a competitive check?

In that case I'd make it a competitive check, because it's two people trying to do the same thing in opposition to each other and the dice will tend to favor the person making the roll.

5 minutes ago, DarthGM said:

In that case I'd make it a competitive check, because it's two people trying to do the same thing in opposition to each other and the dice will tend to favor the person making the roll.

Oh, thank you; I didn’t realize it was a probability issue.

1 minute ago, ObiWanBilbo said:

Oh, thank you; I didn’t realize it was a probability issue.

Yeah; positive and negative dice amounts being equal, the dice tend to skew towards "Success with Threat".