Originally written by Rosti LFC on NSider (with thanks to Sully/CRAIGSS). Moved here and updated.
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Using T-Spins Online
Here are some pro's and con's to using T-Spins online:
PROS: They allow you to send huge amounts of garbage in a small timeframe (2 pieces). They also send more garbage per line cleared than Tetrises, so you can send lines quicker because you don't need to place as many pieces down.
CONS: Standard setups can be tricky to do quickly, and against a good opponent, it is likely you will have recieved enough garbage to kill you before you can pull off the maneouver. Another disadvantage is that the setups are easily ruined by mistakes or banana items, and the playing field you will be left with will be pretty awful.
The secret of t-spins in multiplayer is not to be able to set them up, but to be able to see how a small manipulation of the playing field will create the opportunity for one.
For example, the playing field looks like so and your next pieces are to the side:
Your Tetris orientated mind would position them something like this:
As this would keep the field open for Tetrises and would maintain an 'even build' structure. However, the layout can also easily be use for a t-spin triple by arranging the pieces differently, like this:
And voila! Six (or seven) garbage lines are sent to your opponent if you get a t-piece. The field also requires little work to get back on to Tetrises (possibly a J-piece on the left and a square in the centre). This is the best way to use t-spins online against opponents - not by knowing how to set them up from the start, but by seeing how you can quickly create one halfway through a game.
Triples are nice, but even if you are incredible at spotting the opportunities, it is unlikely that you will be able to use them often. The real weapon in the arsenal of a good wifi player is the T-Spin Double. I can almost guarantee that every player in the top 100 uses them extensively, or they have incredible, near inhuman speed to make up for it. The basic double setup is:
The main advantages of T-Spin doubles is that they are easy and quick to setup, and leave your playing field intact. Here are a selection of simple setups:
As you can see, it is possible to use every piece to make a setup,and unlike T-Spin Triples, the opportunities arise often if you can spot them (usually only needing one or two pieces), without you even trying to set them up.
Before attempting doubles it is best to take a second to glance up to your next pieces to make sure that the t-piece is in your next seven blocks. If it isn't, then forget about it, because it will take too much time and you will have to stack around the setup while waiting for the right piece, leaving you with an unbalanced field afterwards, which will take time to fix.
Other Setups
There are several other t-spins setups that can be used in online play that are more complicated and are slightly less obvious than the triple and the double. Usually these setups are done from the start, when the field is clean and they are easier to set up, especially with the Randomiser used in Tetris DS. There are several alternate setups, the most commonly used being the Super T-Spin Double, the Double Triple Cannon and the Imperial Cross.
Knowledge of these extra setups can be extremely useful. Though the opportunities to use them tend to arise less frequently than those for the t-spin double in open play, if the first few pieces are given in a generous order then they can be set up quite easily at the start of a game. Again though, it helps to either have a T-piece in the hold, or to make sure you'll be getting one soon, as you can get quite a nasty field if you have to wait too long or abort the setup.
Using T-Spins With S/Z Starts
T-spins can also get you out of an awkward starting position, when your first two pieces are "Z" and "S." Since you can only hold one, you're forced to drop the other, leaving a hole that is most easily filled with a soft drop. An easy alternative is to do a t-spin single:
In a perfect scenario, this only requires four blocks (one has to be the t-piece). It also sends two lines of garbage and makes your next Tetris count as back-to-back. This allows the player to benefit quite well from a situation that would otherwise have either slowed them down due to the soft-drop, or forced them to make a hole at the base of their stack.
Animations of T-spins:
