Don Hayes has made an interesting submission to TG on Dig Dug marathon settings. His submission tests the limits of what the TG community will accept as an evidence package. He submitted partial video of the game, but removed major sections of his play, presumably in order to protect his patterns/strategies from being copied by others. There's been lively discussion about his submission over at TG on the thread which may of interest. I encourage interested parties to post comments and engage on discussion on the TG thread if they are TG members rather than post here.
http://www.twingalaxies.com/showthread.php/146913-Arcade-Dig-Dug-Points-Marathon-5-429-010-Donald-Hayes-George