Check post #9. That's not the type of puzzle that ends in a decisive advantage after a few moves. The exchange sac looks obvious, but there's a lot to play ahead.
How to solve chess combinations ?

Check post #9. That's not the type of puzzle that ends in a decisive advantage after a few moves. The exchange sac looks obvious, but there's a lot to play ahead.
Exactly my point...

Well, even I see how to continue that. Maybe tactic trainer is not very accomplished. I don't know about ECC, but Ivaschenko's Manual of Chess Combinations is very recommendable IMHO. It has four books/levels, from beginner to CM.

Well, even I see how to continue that. Maybe tactic trainer is not very accomplished. I don't know about ECC, but Ivaschenko's Manual of Chess Combinations is very recommendable IMHO. It has four books/levels, from beginner to CM.
Really? How? I don't see it at all.

I'm not sure if I'm correct in English. "Liberación de espacio", when you open lines to a piece by moving other, wich is usually sacrificed.

I'm not sure if I'm correct in English. "Liberación de espacio", when you open lines to a piece by moving other, wich is usually sacrificed.
I don't see anything like that. Show us how you are going to convert your advantage after exchange sac.

1. Rxf6 exf6 2. Qh7 Kf8 3. Nxf7 Kxf7 4. Bh6 As far as I can see. Due to the pin, the black bishop is captured, and white has got a pawn for the exchange and the black king is exposed. I don't know if this is clear advantage, but it would be my attempt. Maybe I wouldn't see it in a real game, but in a puzzle you know there must be something.

I see. Well, for me the answer is clear: according to the original post, this enciclopedia is too tough for the moment. Better try something different first.

I see. Well, for me the answer is clear: according to the original post, this enciclopedia is too tough for the moment. Better try something different first.
True.

1. Rxf6 exf6 2. Qh7 Kf8 3. Nxf7 Kxf7 4. Bh6 As far as I can see. Due to the pin, the black bishop is captured, and white has got a pawn for the exchange and the black king is exposed. I don't know if this is clear advantage, but it would be my attempt. Maybe I wouldn't see it in a real game, but in a puzzle you know there must be something.
1.Rxf6 exf6 2.Qh7+ Kf8 3.Nxf7 Rxc2... Obviously white has threats Nf4-e6 or Nf4-d5 and Rf1 but i cant see anything decisive and black can always give up extra material
1.Rxf6 exf6 2.Qh7+ Kf8 3.Nxf7 Kxf7 4.Bh6 Rg8 5.Nf4 Bc8 6.Qxg6+ Ke7 7. Nd5 looks promising obviously black is forced to obey this variation
1.Rxf6 exf6 2.Qh7+ Kf8 3.Nxf7 Kxf7 4.Bh6 Ke7!?
1.Rxf6 exf6 2.Qh7+ Kf8 3.Nxf7 Kxf7 4.Bh6 Rg8 5.Nf4 Ke7
1.Rxf6 exf6 2.Qh7+ Kf8 3.Nxf7 Kxf7 4.Bh6 rg8 5.Nf4 Rxc2
All these stuff and more possible, even moves like d5

Maybe you are right but bishop is not lost yet after Rg8.
And even if bishop is lost, white sacrificed full rook in previous moves.

My question is clear, it is always said that to improve your calculation and tactical vision solve lots of combinations, but how to solve them.
I started solving encyclopedia of chess combinations today, in 10 hours of work i solved 9 and only 2 of them were correct, another 2 of them were partial.
The ECC has some really difficult positions. Which edition of the ECC do you have? The latest, the 5th, has graded problems: basic, intermediate, and advanced. The older editions didn't have the grades. My son is nearly 2500-rated on Tactics Trainer and he finds some of the intermediate puzzles in the 5th edition very tough. I imagine the advanced puzzles might give GMs trouble.
He is talking about puzzles like the one he posted himself