Sounds like minimax with a depth limit. Lots of notations in the paper, but it looks like min and max are both used. I thought this was an interesting snippet:

Sounds like minimax with a depth limit. Lots of notations in the paper, but it looks like min and max are both used. I thought this was an interesting snippet: >At the core of the following construction is a dogmatic prior [LH15a, Sec. 3.2]. A dogmatic prior assigns very high probability to going to hell (reward 0 forever) if the agent deviates from a given computable policy π. Note: That is the only use of the word "hell".