T-SPINS · LESSON 5 OF 6
Choosing a stacking system
AFTER THIS GUIDEYou can choose a system for a specific practice goal and recognise when its preferred pattern should give way to cleanup.
Pick a decision to practise, not a badge to wear.
A stacking system narrows your choices by giving pieces recurring jobs. That can make planning easier, but the saved effort is useful only if you can adapt when the queue or board no longer supports the pattern.
LST repeatedly develops TSD structures with alternating roof shapes. Learning it asks you to recognise the next surface and accommodate pieces that arrive out of the preferred order. It can extend into a Fractal when the lower structure is suitable.
ST uses a recurring S-shaped working pattern, or Z in its mirror, alongside the rest of the stack and periodic I clears. Its repetition makes dependencies easy to study; it does not guarantee easy access to garbage underneath.
DT practice focuses on a Double-to-Triple construction and its exit. That is different from choosing the DT Cannon opener: midgame DT must fit the board you already have. The value of practice is seeing a workable construction, not reproducing an opening script on every surface.
Compare the jobs, not just the score
Use the same question in each mode
Ask: what does the next T do, and which cells must be built first? In LST and ST, identify the recurring roof. In DT, identify both attack stages and the cleanup after the Triple.
Track a dependency
The illustrated I-only gap shows what a commitment looks like. In each system, find its equivalent: a place that only one upcoming shape can repair. How long can you safely wait?
Compare the exit board
After one cycle, inspect height, holes and available landings. Choose the system whose decisions you can explain, then gradually increase speed.
This four-deep one-column gap calls for a vertical I. Covering it adds another dependency.
Common mistakes
Assuming a pattern name guarantees efficiency
Inputs, queue order, wasted pieces and recovery all matter. A nominally strong method played blindly can leave an unusable board.
Trying three systems in one short session
Stay with one decision long enough to notice repeated errors. Use comparison sessions intentionally, not whenever a run becomes difficult.
Treating the coach as a competitive opponent
The coach prioritises its mode’s skill. Its preferred setup can differ from a practical attack under real multiplayer pressure.
TAKE IT TO THE BOARD
Three short samples, one choice
- Play 20 pieces in LST, then ST, then DT, with Gravity Off. Select each mode manually.
- For each, record one dependency and one repair you understood. Do not compare only lines cleared.
- Choose the most understandable system and repeat a 20-piece run, focusing on that dependency.
What counts as progress? You can explain why you chose the system and what failure you are learning to recover from.
Open practice ↗Opens the mode. Set Gravity and NEXT yourself; your current settings are kept.
Keep these terms nearby
NEXT IN THIS PATH
When the T doesn’t come
Manage dependencies and recover without protecting a doomed setup.
Read the next guide →Further reading
For setup variations and additional examples, see FOUR: LST stacking. The practice task here is original to Stacking Lab.