I agree.
If 15.Bxd8 (instead Bxe4) then
15...Nxd2+
16.Kg1 Bf5
17.Bxf5 Nxc4!
18.Bh4 Rxf5
19.g4 Bxb2...this is black is better with 1 pawn up.

Compared this with 17...Rxd8?!
18.Bd3 then black still a pawn down.

After 17...Nxc4!, its not wise for white to force the event for being greedy.

18.Nxa7? Rxa7 19.Bd3 Nxb2 20.Bb5...this position black is MUCH better white h-rook just caged and white a-rook obliged to guard his a-pawn. The 2 black rooks and bishop are very active and white d-pawn is also will fall...0-1.

18.Bxg6!? is better
18... hxg6
19.b3 a6
20.Nc3 Rxd8
21.bxc4 Rc1...this position also black is better white h-rook still caged although black is a pawn down, it would be soon paid off because the activity of his 3 pieces, example:

22.Rc1 Rb4
23.Nd1 Bh6
24.Rc3 Re2
25.a3 Rb1
26.Rd3 Rc2
27.Kh2 Rxc4...black got a pawn back and still better with superb activity.

22.Rb1?? (instead Rc1) is bad
22...Rxb1+
23.Nxb1 Re2! and now either the a-pawn or f-pawn would fall with the threat of Bd4

So the conclusion is 13...b5 is a good move and honesty, its a complex one, you need at least oozing a sweat to think the variation of the line.

Beside 13...b5! also there is 13...a6 ...its a quite move and promising a solid game.

Im very sure that after blacks move 39, white position is bad.

White down a pawn and soon the d5 pawn also will down. And the black king position very strong.

But for me 13...b5! is my choice>

What is the continuation after cxb5? What positional plus does black get for being a pawn down? Does it have to do with black playing Qa5 after that? And whites knight being pinned to the queen? And then the d5 pawn being weak and he has to give up his DSB now that the queen is no longer pinned and it being under attack? Someone help a patzer out? hehe

<what plus black get being a pawn?> See <dumbgal> post and of course my post. Black get initiative. I can see you are a rookie. So i suggest you DONT make 13...b5 move. You can DO the 13...a6 move.

<Qa5 after that>
Nope, just like i say Bb7 better.

<why give up castling with 11.Kf1> why ask me. Ask Movsesian...he;ll tell you

I suggest you, learning the basic opening, initiative, outpost, development, etc,etc. Its clearly form your questions and your previous posts that you are a layman to chess.

I understand initiative, you don't have to be an @#$%*@! about it. I am not a 'layman to chess'(although yeah, i suck), i just tend to visit this site and post when i'm under the influence, so sue me.

Yes, you suck.
Your posts also sucks, you can learn from my previous posts about chess either you use your engine or not. With reading my posts surely you will find yourself in the better shape.

<All you had to say was Bb7> All you had to ask just <Qa5 after that>. Posts your deep analysis and i will post mine.