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There is some open-source code in this area, and hopefully there will be more going forward. Here's one example: https://github.com/EricSteinberger/Deep-CFR

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a. Is CFR applicable in single player hidden-information games? (e.g. state is initially hidden, gradually revealed to the agent, but there is not adversary)

b. How much more efficient is the improved search algorithm? the $150 number sounds like a couple of order of magnitudes..

a. There was this paper a couple years ago applying CFR to single-agent settings: https://arxiv.org/abs/1710.11424

b. It really depends on the game and the situation. It can be several orders of magnitude in six-player poker. In other games, it can be even more.

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