if your a Righty fighting a Righty.
when he throws the jab block it with right hand, when he throws the straight right slip it to the outside of his shoulder while moving close to him. when his arm is extended your head should be by his shoulder. As hes bringing his arm back you moving away from him with a left hook on his chin.
you wanna try to get behind his peripheral when you do this because what a boxer doesnt see coming hurts
if you execute this well and know how to pull his body to you with your legs when throwing a hook so that he falls foward it will set him up for a beautiful right upper cut.
you should already be set up to throw a powerful upper cut after the hook.
this also works for just countering straight rights