I'm 1520 fide and losing because the opening

I followed until now the advice to avoid study specific opening because they are not suposed to have a big impact in my level.

But when I face the taimanov sicilian, the french and the caro khan I end in a very dificulty situation in 6-9 moves, in pressure and, because of it, there are only tactics for the other player. I don't get any oportunity to attack, use my pieces and stuff like that.

what opening books should I read in this level ?

I'm thinking in "how to play the sicilian defence", "dismantling the sicilian" and "mastering the french".

I stil didnt find any book that explain caro ideas.

I have played a lot of short games so the slow games I'm refering to are deep in the archive, but I'll search for it.

I'm not exactly losing straight away in the opening, but the games in the taimanov (sometimes other sicilians), french and caro-khan (as white) and QGD (as black) goes like this:

I play following the principles, develop my pieces and castle, but then the other player knows exactly where to put his pieces because of the opening he plays (In the french and sicilian, they have "thematic" place for his pieces). Then 7-8 moves into the game his pieces are very well coordinate and I have my initiative fades away. 

The taimanov is the classic example, the Bishop goes do b4 on move 4 and there is it, black holds the initiative from now on.

I found an example, in this game black take the initiative very easily and launch an attack from the open d file and shaky white's king side. Being attacked and on pressure, I miscalculate 4 ply ahead and lose a piece:

Yep, losing a piece is bad, particularly when it's the king. :(

Was that just a novel way of resigning?

You main mistake is that you tried to play the English attack against the e6 Sicilians. That doesn't usually work well for white because black can play an early d5.

He will have tactics... and he must be trained to find them.

My coach made me pick an opening, when i was 1200-1300.

I wanted to play everything. He said otherwise. I was glad he did.

I will give you that the mainline e6 Sicilians can be much easier for Black to play than White ... which makes me wonder why you play the Open Sicilian despite not having much or any opening study in these variations.

There are numerous anti-Sicilian ideas that you can use that still follow opening principles: the 2.c3 lines allow you to more directly fight for the center; the Bb5 lines allow you to play normal moves and retain a slightly better position; the Closed Sicilian is Nc3, g3 and a bunch of regular moves after that, and it's generally easier for Black to make a big mistake; the Grand Prix Attack (2.Nc3 and 3.f4) has some recent material and gained a surge of possibility; and if you still want to play Open Sicilians, you can opt for the g3 lines that Skye recommends above, which are basically unknown at amateur level.  If you play those for ten games or so, you'll have far more experience than 95%+ of your opponents in the resulting middlegames.

Opening principles are good enough to deal with symmetric openings. But, they are not good enough for asymmetric openings. You need opening prep to deal with asymmetric openings.

In your game, why bxc3 instead of the safe Qxc3 (where u are clearly better in my opinion with bishop pair and no weakness).

Maybe u were afraid of Qg3, but then go forward : 16.Qxc3 Qg3+ 17.Bf2 Qxg2 18.Rg1 with 0-0-0 following or if u can't, prepare it with Qd2 to protect Bf2 for example.

In general, always try to see an active way to solve problem, and avoids to weaken your position like u did with bxc3.

Learn to play a "black repertoire" (even the Hippo, will work in this case).

Then simply play that system with the white pieces.  End of story.

Moves 40 to 60 of a chess game are lots more important for increasing your playing strength than going down that chess rabbit hole -- into 500 years of Chess Opening Theory.

To wit -- you can always play the Ruy Lopez, and keep debating what's the best move somewhere around move #45 in the theory.  Whatever floats your boat.

You have been warned.  :-)

thank you very much for the tips

see this,

if you are beginner, or less experienced in chess theory, you should, initially, avoid such opening like open sicilian (with d2-d4...), french / caro kann main lines or whatever mainlines...

so chose some less sound variations,closed positions,  until you get little stronger and experienced.

 this is because the one should learn more about fight in middlegame and endgames, so that he would be able to understand openings. if go for theory only, after 8th or 15th move he would find himself in a strange situation, and todays oponnents are not gentlemans at all....

Possibly of interest:
My First Chess Opening Repertoire for White by Vincent Moret
https://www.newinchess.com/media/wysiwyg/product_pdf/9033.pdf

A Simple Chess Opening Repertoire for White by Sam Collins
http://www.gambitbooks.com/pdfs/A_Simple_Chess_Opening_Repertoire_for_White.pdf

Thank you, I'll read the emms book and adopt sidelines for now

Oi Lawkeito, tudo bem?

There are different views how people should deal with openings. Almost everybody agree that you should not learn things just through memorisation, and you should avoid learning lines in depth.

However: you have to learn openings. There are different ways how to learn them. You can follow the lines given in a (paper) book, or from videos, or just taking the lines played by strong players from a database. The advantage of learning openings (beside of course endgames, tactics, strategy) is that you can always compare the opening played in your games with your repertoire. 

One of the main concerns people have is to invest too much time learning openings and having few time for the rest. This is correct. The problem is that many, really many people just read the books, and forget almost everything after few hours. So I suggest you to learn by spaced repetition.  You will learn only the amount of material which you are able to review frequently, not more. You can try the website Chessable to have a look in such books (digital books). There is an amazing repertoire there from Rafael Leitão, the best Brazilian chess player. 

Boa sorte!

thank you, torru! great insight I'll definitely look it up.