Short boost is a trick allowing Samus to charge speed booster in less space than would be normally possible.
embed
Short boosting can be made easier by storing the shinespark with a map buffer.
embed
Screw Attack Short Boost (SASB), also called Short Boost Early Screw (SBES) allows Samus to reach screw attack early without using space jump.
See also: Pause Buffered SASB