Magnus Carlsen is one suspect, but let's be honest here. Any Magnus fanboi can create an account and use an engine to play well. The pool of suspects should be fairly large. Also, correspondence chess is generelly frowned upon by top players because of the heavy use of engines. Also, why play a mid/high rated opponent when your correspondance skills match weaker engines? Apart from the obvious reasons why not, it's still his username and he does play the Richter-Rauzer. I'd rate the probability to lower than 1 % but not 0.
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