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It would be interesting to hear more about this from someone whose field this is.

My first naïve thought was that surely it's lack of eyes on the problem. After all, we have AlphaGo. Then again, I can't say I've heard much about AI in games with imperfect information. There's StarCraft 2, but there AI has not quite surpassed humans.

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Something you might be interested in is the OpenAI group's attempt at making a Dota 2 playing AI which, if you're unfamiliar, is a 5v5 imperfect information computer game. The AI they made was able to take games off of many top players/teams. The interesting factor on top of all that is that it isn't a single AI playing as 5 players, its 5 AIs acting independently without communication. Really interesting stuff given how complex a game Dota 2 is.

I had heard about that in passing. I didn't realize it was actually a team of AIs, that is more interesting than I thought!

What I did hear was that the AI was very sensitive to whether it gets its pick or not.

One thing that makes bridge very difficult is you need to be able to explain your partner's bids to your opponents. This means you either have to hard-code a bidding system (lame) or make a ton of progress in explainable ai.

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