When has a batter given himself up?

[Rich Ives]

Originally Posted by CT1

In many 9-under games, the field is ALL dirt, which is probably why the "vicinity" clause is in the rule.

"Vicinity" is not in the rule.

Rule 6.09(b) Comment: A batter who does not realize his situation on a third strike not caught, and who is not in the process of running to first base, shall be declared out once he leaves the dirt circle surrounding home plate.

If there's no grass then you can envision where it would be, but if you do so be consistent. Might even be worth scribing one at the start of the game.