jimrandomh comments on Verifying Rationality via RationalPoker.com - Less Wrong
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I wish we could do this but playing without real money wouldn't work for improving rationality and I don't think it would even work for testing rationality in a meaningful way.
Also, I think this sets a good precedent. People who will bet on cards are far more likely to bet on their beliefs in general, which is a sign that they actually have beliefs as opposed to just "things they would like to be true". Not taking +EV bets that represent negligible portions of your net-worth is epistemically irrational so it seems like a rationalist community should be encouraging betting when it is done at reasonable stakes as a way to train or test beliefs.
After some amount of practice, playing poker should be +EV. Betting money while still a poker noob, however, is certainly -EV. I'd be more willing to bet money if I had some indication, preferrably in the form of an Elo rating, that I can expect to come out ahead.
After we cover some introductory material on our site, I plan to recommend people test out play money games after signing up to learn how the software works and get a feel for the game, then take these two tests. I'll try and get some scores from winning, marginal, and losing players so I can make a recommendation for a cut-off on whether to play or keep studying first.