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Vladimir_Nesov comments on Outlawing Anthropics: An Updateless Dilemma - Less Wrong
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If there is some probability of A cheating even if B precommits to punishment, but with odds in B's favor, the situation where B needs to implement punishment is quite possible (expected). Likewise, if B precommiting to punish A is predicted to lead to an even worse outcome than not punishing (because of punishment expenses), UDT B won't punish A. Futhermore, a probability of cheating and not-punishment of cheating (mixed strategies, possibly on logical uncertainty to defy the laws of the game if pure strategies are required) is a mechanism through which the players can (consensually) bargain with each other in the resulting parallel game, an issue Wei Dai mentioned in the other reply. B doesn't need absolute certainty at any stage, in both cases.
Also, in UDT there are no logical certainties, as it doesn't update on logical conclusions as well.
Sure, but that's the convenient setup. What if for A to cheat means that you necessarily just mistaken about which algorithm A runs?
UDT will be logically certain about some things but not others. If UDT B "doesn't update" on its computation about what A will do in response to B, it's going to be in trouble.
A decision algorithm should never be mistaken, only uncertain.
"Doesn't update" doesn't mean that it doesn't use the info (but you know that, so what do you mean?). A logical conclusion can be a parameter in a strategy, without making the algorithm unable to reason about what it would be like if the conclusion was different, that is basically about uncertainty of same algorithm in other states of knowledge.