psi_radar
Black Belt
I'm smaller than you--5'7 and 165, so I know where you're coming from.
A lot of good stuff has been said here already--try to get some continuous training, perhaps at a boxing gym to get good with basics and build stamina fast.
You have the advantage of training against a particular opponent. The simplest thing to do is to just avoid this guy if he's trouble. If you absolutely must fight, observe his weaknesses. Is he slow? Does he look like he'd try to grapple or strike you? Knees in particular are vulnerable areas for big guys.
If he doesn't have any training, he'll probably try to use his mass in a straight line against you. Get off that line and strike low, then high. Repeat.
If you can't get off the line, then he will probably go for the most common attack I've seen, the multiple right-left, right-left, aimed to the head. Use your arms to defend against these as MJS said. We call this the cage. Move in close so you don't bear the brunt of the attack. Absorb the hits in this manner, then right after he lands one and there's a pause before the other one, put him off balance with your arms, pushing up and back (rocking him back on his heels) and repeatedly knee him in the groin and lower abdomen. As he bends from the waist, elbow in the face, perhaps an uppercut or two, then escape to safety.
Just one approach.
A lot of good stuff has been said here already--try to get some continuous training, perhaps at a boxing gym to get good with basics and build stamina fast.
You have the advantage of training against a particular opponent. The simplest thing to do is to just avoid this guy if he's trouble. If you absolutely must fight, observe his weaknesses. Is he slow? Does he look like he'd try to grapple or strike you? Knees in particular are vulnerable areas for big guys.
If he doesn't have any training, he'll probably try to use his mass in a straight line against you. Get off that line and strike low, then high. Repeat.
If you can't get off the line, then he will probably go for the most common attack I've seen, the multiple right-left, right-left, aimed to the head. Use your arms to defend against these as MJS said. We call this the cage. Move in close so you don't bear the brunt of the attack. Absorb the hits in this manner, then right after he lands one and there's a pause before the other one, put him off balance with your arms, pushing up and back (rocking him back on his heels) and repeatedly knee him in the groin and lower abdomen. As he bends from the waist, elbow in the face, perhaps an uppercut or two, then escape to safety.
Just one approach.