Suggestions

[Kamikaze28]

One remaining problem is scoring. Can the firstly eliminated player be scored before the remaining two are done? Otherwise, he'd have to drag an essentially finished game around for days just to receive his -points. Doesn't sound like fun.

Another idea would be to determine the order of the surviving players based on their base HP. So in the above scenario, the result would be:
1st place: player B (2 HP)
2nd place: player C (1 HP)
3rd place: player A (0 HP)
If feels like a conflict for player C to end the game and come in 2nd - he could have tried to win instead by not destroying player A and possible keeping him barely alive - which doesn't sound like fun for player A to be honest.