No, it's the one where you can jump and then do the "flying knee" when landing on every enemy throughout the entire game. It's the most effective strategy if you can master it. Kind of like the back elbow in the arcade version of Double Dragon 1.
Also, I played a bit of Double Dragon II for Mega Drive and while it may seem like a bad Double Dragon game ... it is as I suspected pretty damned close to the arcade version.
Here's a comparison:
Mega Drive:
http://www.youtube.com/watch?v=XmbDec2MY2A
Arcade:
http://www.youtube.com/watch?v=DZHX6PHI4LI
Yeah, it gets a bit laggy when the screen is busy, but overall it's a more authentic arcade version of Double Dragon II than what is featured on the NES.