What do you mean, &quot;in all possible games&quot;? The assumptions that hold for this game don&#x27;t hold for the Prisoner&#x27;s Dilemma.<p>Like someone else said, you seem to be speaking in jargon. &quot;Superrationality&quot;, &quot;updateless decision theory&quot;, none of this matters in order to understand the Pirate Game. The rules of the game are very simple, maybe the pirates thing is throwing you off? That&#x27;s just a theme for the puzzle (people aren&#x27;t rational like this, and of course pirates aren&#x27;t, and the whole situation is extremely artificial and unrealistic). The non-intuitive solution is derived from the rules <i>as stated</i> without any need for additional theory.