The best solution to a haymaker is not to be there when they throw it. What you do with your hands is an auxilary at best.
Now the problem with this advice is that you might be taken by surprise. You see a lot of that on Youtube. When I'm surprised, I flinch and cover-my head. Ducking the head, bringing the arms up covering my face and cheeks, hands grabbing the top -back of the head, elbows in front. This is a deeply rooted survival reflex, and no amount of training will totally eliminate it. So instead,
use it. Call it a
highly compressed tan-sau with a simultaneous elbow strike, if you will.
When the punch comes go with your instincts, but aggressively. Against a right, cover-up and step i
nside, turning left toward the punch. By moving explosively forward and inside, you evade the power arc of a haymaker, the nearest covering arm (left) jams the punch, and the other arm becomes a vertical elbow jamming into their face.
Now I know people are going to say that this won't work so well against a "proper hook". Yeah,
that's true. Proper hooks knock trained boxers out. But covering and rolling with it can help blunt the blow. What really helps is moving-in and rolling into that vertical elbow strike. If you survive the hook, you can definitely give back some of the pain.
OK I took a 2-minute look on Youtube and this is the first thing that caught my eye:
This is the cover I'm talking about, except I use both hands to cover and guard, and step explosively forward, turning a bit so that if the left covers, the right forearm or elbow hits hard. Anybody else like this?