His life score in CC was impressive: 94 wins, 1 loss, and 10 draws.
But I guess correspondence world champions would not have a chance against world champions. This is the opinion of a CC world champion, Fritz Baumbach. He said they would not lose every game, but every match. The reasons: strong players OTB can concentrate longer, over several hours. In CC people can make breaks and play when they want.
In Jeremy Silman's review of Hans Berliner's book, he writes:
"My angst towards postal chess began when I read that many postal aficionados honestly felt that a postal World Champion would beat an over-the-board World Champion in a postal game. The postal caste never seemed to realize that their understanding of chess as a whole was so far below any over-the-board World Champion’s as to make the argument virtually laughable."
I don't know if Jeremy is referring to engine assisted chess here or not, but it may be that he wrote this long enough ago that engine assistance would not have been helpful.
Anyway, would the correspondence world champ beat Magnus at correspondence chess, if Magnus took it seriously? I suppose both cases of engine assistance being allowed/ not allowed should be considered.
I have never heard of a correspondence match between a top GM and a top correspondence player - and I've googled it - does anyone know of any?