Zugzwang (not sure if i wrote corecty) is a pozition in witch the plyer that makes te first move loses. So i thought : hey this might be a weapon, but i'm not quite shure how to get my player into zugzwang. Maybe you could give me an advice how do do it :), or show me how you did it . In this game we can see how Bobby Fischer, playing White used zugzwang to win.

of course it can be a weapon , it takes tempo from the opponent so can be match winning,,.......

I think you answer your own question, though my favorite example is Samisch-Nimzowitch.

Yep, I'm sure it could. I guess you need to know what your doing though... most people can't claim to have robert fischer's creds.

Its extremely useful weapon in the endgames, though sometimes it can prove useful/piece winning strategy in the middlegames too... Here is more info on Zungwang for your reading pleasure:

http://en.wikipedia.org/wiki/Zugzwang 

zugzwang can be very useful when you need your oppenent to give up ground with his king in the endgame, you can then gain the opposition and force the opponents king back to an inferior position.......

A common method of putting your opponent into zugzwang is "triangulation". If you look up the term you should find a bunch of pawn vs pawn and queen vs rook examples to look over. In Bishop vs Knight endgames, the goal of the side with the bishop is often to put their opponent into zugzwang, taking advantage of the fact that a bishop can often lose a move (when operating along one, long diagonal) while the knight cannot--each time it hops it guards completely different squares.