OP:
> He is widely regarded as the greatest chess player to have ever lived. His opinion on what it takes to play high level chess is worth taking extremely seriously.
- A: Magnus is a great chess player
- B: Magnus claims cheating because "gut"
- C: Therefore Hans cheated
The argument rests solely on the fact that since he's an expert his word should be taken "seriously," heavily implying that Hans cheated.
> To bring up that fallacy here is just lazy thinking.
I disagree and you're not going to convince me otherwise with statements like this one.