I think we should just keep it simple and post in the IC. We can all do it at once and there wouldn't be a need to use an external site. But I don't want to wait for every single duel to finish:

[quote]Person 1 posts in the IC, initiating the fight.

Person 2 responds to the situation.

Person 1 responds, saying that their character is unable to fight any longer. 

Person 2 responds by stating his characters pride of winning.

~Both Players wait for other 1v1's to finish~

Person 1 and 2 continues on with the RP.[/quote]

There wouldn't be a limit on how many posts there can be either, otherwise it could mean that on the final post that character would have to lose because it can't instantly kill the other. This would also help other people and I determine the fairness of a fight because it would be public.