I'm not really sure what all DTV means by "EVENT". However, from what you said, EVENT at least means live while a lot of races I want to watch are aired after the fact. In that case TTITLE should be better.
As for Sports, Racing instead of Sports, Auto, Sports, Auto does pick up a few things I don't want, including motorcycle, for some reason, but Sports, Racing is really open-ended. I could get people, boats, horses, etc. The right title would narrow that down, but what we really need is Sports, Auto, Racing. I played with Auto Racing as a title but I ran out of space trying to narrow it down.
I think I am on the right track. Ch 214 in PA only airs SD, but it is HD in VA; no idea why. Too bad I can't NNOT CCHANS 214 in PA! Also, too bad I can't abbreviate. Tivo has wild cards which would be nice -- Prac* instead of Practice. OTOH, Tivo doesn't have NNOT, so I have to delete all the stuff I don't want. All-in-all, I have relatively little to delete with DTV.
Oh, it would really be great if you could edit these searches. It is a real pain to have to re-enter the whole thing every time you want to make a change. For example, I have a number of single word titles (CHALLENGE, CHAMPIONSHIP, ENDURANCE, TOURING) that I could combine with AANY if I could edit them later.