[PvK]

I'm with SJ, more or less. All the remaining empires tie, and the destroyed or subjugated/exiled/smashed ones lose.

However, it'd be more interesting to add some other conditions.

For example, the players should have some other difficult goal(s), but the game only ends after X years at peace. If peace ends the game before anyone has completed their goal, they tie.

If competition is something the players want, then peace ending the game can be a way to force players into a war.

PvK