Gianluca,

I was struck by the similarities to English pugilism in the material
you posted. To answer your question, many pugilists advocated
switching leads as good practice. I teach my students to attack and
defend from both left and right guards, as you'll find yourself in
both positions when you move in a fight. Thanks for posting this
info -- it's very interesting.

Best Regards,
-Tim.

> By the way of example the left guard and fist seem to me the same
>of English boxing. He describes in short the techniques, suggesting
>to change the guard from left to right in order to surprise the
>opponent both attacking and defending. Is this last technique a
>classical English boxing manoeuvre?