what I have learned from brawling:
I learned quickly not to kick, your too off balance.
throwing head knocking haymakers has the same "off balance" affect and the wind up takes too long.
Tackling people almost always guarantees the win, but if hes got boys in the crowd your ruined, so its generally best to stay on your feet
Use your elbows, you need alot less space to deliver hits
The knees seem like a good weapon, but again in a mulitman brawl you need to be firmly planted on the ground. If you go down on the floor your heading to a hospital later.
Make a concious effort to keep your chin pointed down, it makes it hard to get you in the neck and it stiffens up your neck so it doesnt twist when you get hit.
Getting hit in the throat is an immediate game ender, you cant breathe, you cant fight.
Bones in your head are thicker than a fist, if they arent careful they will break knuckles and not your face.
Street brawling isnt like MMA, its alot more about defense than offense.