Bet.

The rules could include a ban on one-sided matches; otherwise, playing on an 8x12 map will be fun for both players... Playing 8x8 for money is just crazy)))))))) You can only have some fun and get some variety on it.
But in general, if both players are willing to play, it's worth clarifying the main points first and then specifying the details; this will result in less text and everything will be clear.