yeah. every easy opportunity, and the in-between line clears create those. they also remove blocks from the well, which might have otherwise contributed to overstacking. with worldwide garbage, you take what you can get. you can't always keep stacking upwards for tetrises just to keep BtB alive. you already know this because your rating is higher than mine and as far as losing time, you lose the most time by stacking too high over a hole underneath, unless you have a specific plan for clearing it up with 1 or 2 pieces. still, it takes time to stack up everywhere else to accomplish that. there are ways to consistently T-spin while uncovering garbage. i'm not going to say 100% of the time or give any number, but it can be done very often. there are good and efficient ways, we just need to find them. we all do it sometimes though. i've seen you T-spin with nearly every (or every) T piece for periods of time. there's a time to TST, and a time to do something else. the player that makes the best out of each situation is going to win. there are times when a TST setup falls in your lap without any effort. any of those methods could work, depending on the situation the other player is in. this also goes back to hc2 vs. worldwide. if you make a TST here in worldwide the garbage is more likely to be scrambled (and 6 lines at once). in hc2 it wouldn't be quite as effective. but in either case, if the other player is stacked a little high already i'm going to TST. if i'm stacked high, i need to be more conservative and go for a tetris. edit: yoshihiro or STSD, if you have 2 T pieces or time to wait. edit: on second glance, this way looks good. it seems like you would have somewhere to put every piece.