If Muhammad Ali were only allowed to punch with his right hand could he...

[goose 5]

defeat Sugar Ray Robinson ?

[emallini]

Jab yes. Backhand no.

[DrDuke]

No way he would win. It can't even be compared with cases, when fighters won with one hand in reality, like Wlad Klitschko KOed Ray Austin without throwing a right, because there he could do it and he would do it if he needed to. When you know exactly, that there won't be the second hand for 100%, it's a diferent story.