> The way I would guess this played out was that OpenAI tried multiple variants of the game, and this version ended up being good enough to beat human players

> The way I would guess this played out was that OpenAI tried multiple variants of the game, and this version ended up being good enough to beat human players No. We had implemented scripted courier logic for 1v1, and when switching to 5v5 the easiest starting point was to run five copies of that logic. (Dota's Turbo mode also has five invulnerable couriers.) In June, we had more important restrictions to remove — such as wards & Roshan; you personally were focused on the particular heroes we'd chosen: https://news.ycombinator.com/item?id=17392455 https://news.ycombinator.com/item?id=17392455. The couriers only become our most important restriction in August.