Not retracting the jab?

What do you think of this guys opinion on it "you leave your arm almost fully extended, throw small jabs and push as you make space and keep your opponent at bay. The space-maker can be thrown multiple times as you circle around to your opponent’s right side. If you’re throwing multiple tapper jabs, leave arm almost fully extending as you throw multiple jabs to keep your opponent busy. It is VERY important to keep an eye out for your opponent’s right hand since extending your left arm leaves you vulnerable to punches on that side of your head. Also, ALWAYS be moving around when you use the space-maker; if you stand still and stretch your arm you will get hit with the hard right counter. (often used by Kostya Tszyu)
The Ultimate Boxing Jab Guide

I don't think it would be advisable against an opponent that knows how to fight; probably work pretty good on most of today's heavyweight contenders.

There is one instance it works ok on. You used to see Kostya do it on the move and occasionally Barrera would (maybe subconsciously)pull it out of the hat when fighting nose to nose with Eric,but his was more using the already expended arm as an instant block by turning it in to disrupt their shot without having to break from the nose to nose distance(same can happen by dropping your elbow down into the cook of their elbow) that allows you maintain close distance.

Kostya would consciously use it for a feeler though. In Kostyas case;You walk in with it right in their face and hide out on the angle from it while leaving it in their way; then go for them off their reaction. Or you throw the jab and if they dont react,you leave it out and shift your body on the angle so your extended arm is in the way of their lead arm and lays across its trajectory path, but you gotta know that is exactly when you throw your rear arm down the pipe or move in closer and hook in front of their rear and beat them to the draw, cause its rear arm verses rear arm right then but you have the leap on them and the turn or foot shift or both already set up for the power shot.

( I find it strange that the writer mentioned Kostya; but only Kostyas right hand as an answer to it, not his actual technique of using it to his own advantage.:confused:

Excellent info thank you.

No matter what you do, if you do it all the time, then it could be a negative
Just keeping the arm extended and tapping with fast ones is not considered effective punching and it would not be a long term active useful tool:rolleyes: