What's this system called?

What is the name of this system?

hmm i haven't seen such an opening.. and i don't know any opening names (i don't even know the names of openings i use :p), so anybody can help?? :D

Knight/Knights going back and forth. Not a good opening

It's called masterbation, at least untill your opponent makes a move.

Meaningless without moves of the opponent.

The nae is:"black loose"

This formation (d4, c4, Nc3) usually occurs in the Queen's Gambit, Declined.

As others pointed out, a name in this case requires the other side's moves. For example, if Black didn't play ...d5 we can't really call it a gambit.

Alright, I didn't make any moves for black because this formation can be played against many different moves, so I thought it was like the King's Indian Attack, but it's actually a formation occuring in the Queen's Gambit?  It occured in the Grünfeld Defence in a Topalov-Kamsky game though

That's our point - 1.d4 d5 2.c4 e6 3.Nc3 and 1.d4 Nf6 2.c4 g6 3.Nc3 d5 are completely different animals, as would be 1.d4 d5 2.c4 c6 3.Nc3, or 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4, or a whole lot of different openings (these are the QGD, Grunfeld, Slav and Nimzo-Indian, but there are many more).

There are a very few "system" openings, where White could play the same moves against many different Black replies. The King's Indian Attack is one of them. I think they all have in common that they're not the most ambitious moves possible (the most ambitious move would generally be different depending on what Black does...) and they're often touted by opening book hacks as the one true answer to all white's problems, without having to study much. They're (I think) the Colle, the London system and the KIA.

I think it's a naive approach. Black's moves matter.

There's a few others aswell including The Hippo (can be used as White or Black), Stonewall (in certain cases can be used for Black) and the Torre.

Looks like a half queen gambit declined.

Mainline d4 players pretty much play that against anything (except Benoni where d5 is forced halfway through) but since it is a mainline attack for white it never got its own name.

I call "systems" like the Colle System, King's Indian Attack, and the Torre Attack the "paint-by-the-numbers" approach.  They're relatively easy to learn, but Black can equalize against all of them if s/he know's what s/he's doing.  Having said that, even though Black is "technically" equal in the main lines, you might win a lot of games with those openings because you're more likely to be familiar with the typical middlegame patterns that occur in games with those openings.  That's why it's probably a good idea to look at whole games, not just the first dozen or so moves of games.