Games were on a 30 minute broadcast delay with no in person audience. Vibrating butt plug works for receive but can't think of a plausible way for Hans to send the moves out.
He doesn't have to send the moves out, he just has to send them in.
To be clear, I'm not saying I believe this.
[0]https://www.goodreads.com/en/book/show/331807.How_to_Good_By...
The list will also include a special entry indicating "none of the above", which will make the computer switch to the next set of less likely moves.
This scheme could be refined be having some move partitioning on top. For example, an initial list that has only ["pawn move", "light piece move", "heavy piece move"].