TETRIS GLOSSARY
Boomerang
A recovery technique for an STSD-like board with missing support, using an L or J spin to repair the structure. Check the actual supporting cells before assuming the original TSD remains possible.
View in the A–Z glossary →Related terms
STSD →
One connected structure that yields two T-spin Doubles. Often recognized through a three-by-three empty region with J/L construction. It is a distinct geometry from Fractal, not a name for any two consecutive TSDs.
Recovery →
Changing priorities to repair an awkward board and restore usable access after a mistake or broken plan. The selected coach handles recovery within its own mode; it need not preserve a setup at the expense of survival.