Kumite Punching Strategies
The following drills are suitable for advanced students who wish to take their learned basics to the next level for effective application in sparring.

Gyaku-zuki, switch oi-zuki
Objective: Double attack drill - After clashing when attacking with gyaku-zuki, switch legs and follow immediately with oi-zuki.
Attack with gyaku-zuki, step front leg back to switch legs and immediately step in again with oi-zuki.

Gyaku-zuki, turn switch legs gyaku-zuki
Objective: Double gyaku-zuki attack with opposite sides whilst turning
Shuffle in for a gyaku-zuki attack. The opponent turns to avoid 900 by stepping back the front leg so opposite side is forward. Switch legs as you turn 900 to attack with gyaku-zuki on the opposite side. After the first gyaku-zuki, raise the same arm up to guard prior to the 2nd gyaku-zuki.
Footage from:
Kumite techniques seminar 2001 by the Japan National Team Coach, Seiji Nishimura