As is my custom I challenge the highest player possible on the ladder. I did not notice his inactivity of 43 days. I do not have a delete can, so how can I delete this game?

Directly from ladder help:-
Site ratings
All ladder games are played as rated games and cannot be deleted, only resigned.
Inactive players
Inactive players will be removed from a ladder if they have no games in progress and they have been inactive on the site for 60 days.
You look like having to wait 10 days till the skull appears

Thought that might be the case, thanks.