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Actually, I don't think he drank at all. I'm not 100% sure of that, but when I met him, he said he never drank.
Around 99% of all chess players never make master. Of the 1% who do, the overwhelming majority never become IMs. If the ones who do become IMs, a large majority never become GMs. So why the mystery? There are a hell of a lot of really fine players who stay at IM.