I had several rules about my on-court conversations, or advice, during
a match:

1. I’m not going to tell you anything unless I feel pretty darned sure
   about it. You can take it or leave it, but I think it’s true.
2. I didn’t “just talk” except to advise, “shake your head yes, like I might
   know something.” At least the opponent may wonder.
3. Don’t walk away from me in contempt or show me up. If I order you
   off the court for behavior, don’t react in any way but by getting your
   gear and exiting the court.