Gamushiro Stacking (ガムシロ積み)
Gamushiro Stacking is a TST → TSD (or TSS) → PC opener created by KMGZ. ガムシロップ translates to Gum Syrup.
It's possible to build this for all opening bags.
You won't be able to stack your second bag this way every time, but you should be able to for the majority of your bags (66.67% chance). See below for some alternative ways of stacking your second bag, but this is the most preferred shape.
These are the 6 solutions that you'll want to know. You'll have a 78.35% chance of being able to PC with these, but if you can place the T first, you'll have a 92.22% chance.
The field itself has a 99.09% PC chance if you learn all the solutions. Look here for all solutions.
Getting an early O in your second bag is the most common reason for needing to stack your second bag differently. This section shows some alternate patterns that you can use while still preserving a good PC chance. They are ordered by preference. You'll be positioning your L from your first bag slightly differently for each pattern.
Holding the L from your first bag will sometimes allow you to stack in a way that makes the same shape shown in the previous section. You'll be able to stack either the original form or this way 83.33% of the time.
You'll stack your first bag the same way, but you'll be positioning your O differently on your second bag. This pattern will help you cover 91.67% of bags.
The overall PC chance is 92.22%, and here are all the solutions. If you can place the T like below, you'll have a 96.94% chance with 6 solutions.
credit to GenDragFan
Another way to stack when you spot an early O in your second bag would be placing your first and second bags like below. It brings up the stacking probability to 94.72% in official clients and 96.67% in unofficial clients with 180 rotations.
This is good in unofficial clients with 180 rotations because you can also place the S first and then spin in the L afterward, which makes it possible to stack this way in many second bags with an early O.
The overall PC chance is 93.06%. Look here for all solutions. You'll have a 100% PC chance with 2 solutions if you can place the T as shown below.
credit to JimothyJimothy
This pattern should work most of the time if all of the above fails. It brings up the cover chance to 98.06% on official clients and 100% on unofficial clients with 180 rotations.
There is a high PC chance (95.12%), but the solutions are hard to spot. You can look them up here.
Otherwise, just freestyle your second bag. For example:
- テトリス開幕テンプレ まとめ on ガムシロ積み
- テトリス開幕テンプレWiki on ガムシロ積み
- テトリステンプレ集＠テト譜 on ガムシロ積み
- More alternate patterns by GenDragFan. Note how the second pattern here makes the same shape as PC-Spin
thanks to GenDragFan for the help on alternate patterns and for reading through this article