Oops! I was indeed unaware of that rule. But I'm going to claim a draw
myself at next move if Carlos repeats the position, since my only
voluntary retreat from perpetual check would be a loss. (Or would that be
unethical from me now? Please, don't comment on the position itself.)
I do not mind playing as Black in my two remaining games, especially
considering the fact that Michael Howe's withdrawal has spared me the
obligation to play a game I do not like (Cavalier Chess - sorry, Fergus)
against a good player.