I dunno. That still doesn't seem fair. What if they're both experts using knives? I would expect that both might disagree to losing. After all, one of us would die. It also suggests that the players would have to write a script of some kind because they know how it ends, rather than react one post at a time, which is probably what their character will do for the rest of the RP.

How long would PVP posts be? A paragraph, or a sentence or two describing their actions.