Quote from: myndzi
The thing that makes PCs not-so-viable in competitive play is that they're ruined when you get any garbage. "Playing forever" does indeed regularly get perfect clears, but they aren't every 10 pieces, so it'd be even harder to use that in competitive play. You can't get 4-line perfect clears back to back forever guaranteed, but you can do a pretty good job in a bag randomizer, or stack up to 6 or 8 lines, etc.
There was a bot (http://harddrop.com/forums/index.php?showtopic=5435) on TF for a while that was pretty effective at a PC based skimming/hard dropping PC style, but it's unclear if it's really feasible for a human to do that that well.
ahem
P.S. 2 high pcs also exist