Is Q=R+R=B+B+N and i mean is chess a calculation

hmm..it basically a number of importance for each pieces..when u have lesser weapon u have less strategy to attack...

so two rooks is basically better than a queen...coz one rook worth 5 and a queen is 9

two bishops or 2 knights is jz 6 so they are better than one rook...

There really is no hard and fast rule though the points system (Q=9, R=5, N/B=3, P=1) is a good but very rough way to work things out. All of the rules are subject to what the position is like though. A queen can be better than 2 rooks if she is active and the rooks aren't able to work together. A Bishop or knight on their own can be better than a rook in certain positions. In an open position often a bishop is better than a knight especially if you have a pair of them. In closed positions knights can be better than bishops as they can infiltrate the enemy ranks on both white and black squares unlike the bishop.

chess is about good moves and good positions.

you can't say that a knight that is about to checkmate on nextmove worths less than a undeveloped rook that delivers no threat at all.

if you would have the opportunity to capture the rook(5) or the knight(3) , wich would you attack ?
certainly not the rook only cause it worths more points than the knight

And this type of game shows that you can calmly exchange Q for a few minor or major piece  without any fear to lost the  game

it is alway possible, yea.
If you have a better position at the end of the process, than you can trade off.

it just depends on your position.

tacticly, you can exchange anything for anything if it allows you to have a strong position.

At least in the positions I often achieve (semi-closed, highly tactical)... a queen is far stronger than 2 rooks.  On the other hand ... in less 'pawny' positions, the rooks are better.  passed pawns also help rooks immensely.  It's all variable... there are times where two pieces are worth a rook and a pawn... but usually the pieces are considerably more valuable.

I prefer Black, i think he has a little advantage and he can play to win while White must play to draw.

in fact - chess is a very variable game haha
I never tought of this word to describe chess in 1 word.

I've alway tought about Logic, Complicated, War

revoked