Eliezer: I also complained about the lack of a practice method in "The Martial Art of Rationality", my very first post here on Overcoming Bias.

But your suggestion that this is why rationality-contests are dominated by intelligence is very, very deep.

Surely it is a tautology. "Intelligence" is what we say people have, when they do well at rationality contests. Compare "talent", which is what we say people have, when they exhibit prowess at a practisable activity beyond what would be expected from the practise they have put in.