How do you beat Tyson?

For the first 1:30 of round 1, one punch from him knocks you down (as you probably already know). Ya just gotta practice dodging, and countering with a 1-2 punch to the face after each dodge. Once 1:30 is gone, it'll be much easier.

And in the first round, the first 1:30, say if he throws a right uppercut (to your left) counter with lefts to the face, and vice versa. His energy will go down faster. If you do this the other way, one of your punches won't drain any of his energy. You can knock him down twice in round one doing the opposite of what he does. I guess it works through the whole fight too, just hit him with the opposite of what he does.

I beat him for a TKO in round 2 in just over 2 minutes. If you keep a sliver of his energy at the end of round 1, you'll knock him down immediately in round 2 (well after that flurry of straight punches).