Yeah, but Avalon or Secret Hitler have pre-defined teams. Part of the appeal of Diplomacy is that it's a free for all and you define alliances as you need them

Yeah, but Avalon or Secret Hitler have pre-defined teams. Part of the appeal of Diplomacy is that it's a free for all and you define alliances as you need them. Thinking it over, Nash's "so long, sucker" is probably the closest example, but I don't know anybody who's actually played it.