Stick Fighter 2

To execute the special move, try this: Press [FORWARD],
[FORWARD-DOWN], [BACK], [BACK-DOWN]. (In numeric keypad
terms, this would be 4, 1, 6, 3 if you're using player 1.)
This will only work if you are facing left, of course, if
you are facing right instead, simply do the opposite! (Information from Cheat Machine)