Trick or Treat on Specter Street: Morphy’s Mansion

I'm stuck here too.
I've tried sending several curls to Morphy's Mansion to move pieces in order to create a buffer overflow (log_move has two parameters: one for the move, to be sent to the overflow, and one to execute a command, I think).
I'm not entirely sure how the board is "mapped" (e.g. a1a2...) to send correct moves. I occasionally got successes, but I can't read or copy the token.

That is the only one I need to complete all challenges, I am not sure how to exploit buffer overflow. If anyone has a hint would be great or if Immersive will have a meeting to know how to resolve it, would be amazing.

Any one solved this?? Only this is pending and particularly final task