How to play with advantage(+2),Dutch Defence from this closed position

Hi
I played this one some minutes ago-

After analyses I saw that I had +2 advantage but I don't know how to win it from 19th move who closed board?
Thank You for Your opinion

After some preparation, an idea would be sacrificing on h4 with a strong attack on the kingside. White obviously lackes freedom of movement due to your space advantage.

Agree with @Tethys: your only way to win is to sacrifice either a knight or your bishop on h4. So you should manoeuvre to prepare the sacrifice. White is cramped, but he probably can manoeuvre nevertheless to defend against your sacrifice. Do not let the computer fool you with the -2 evaluation. Engines enjoy playing to and fro in closed positions just happy with their -2 evaluation, but accomplishing nothing. That is exactly what happened in this game. Black played useless moves and did not prepare the sacrifice and white played useless moves and did not defend against a possible sacrifice.

Guys, let me tell you a secret: high numbers don't say anything at all necessarily. Fortresses have over 50 moves typically +3 or +5 without a change. A "good" position is only a good position when it can be improved - otherwise it's not good.

Yes indeed. However, if we assume in the final position the black knight were on g6 instead of f6, then the sacrifice 69...Nxh4 70 gxh4 Qxh4 leads to a won position.

I believe he can hold the position after move 19. For example he plays Bh1,Rh2. Then h4 is protected three times and can just be attacked three times.

Then he plays Nc1,Ra2,Ba1 and his rooks are connected. A double piece sac against any of his other pawns will then probably not succeed.

For black it is better to avoid 7...a5-a4. And later it is better to prepare h5-h4 instead of playing g5-g4.

Indeed, Bh1, Rh2 provides 3-fold protection of h4. However, black can push an intermediate ...g3 as soon as white takes back gxh4.
So I guess black should prepare to sacrifice right away: ...Ne7, ...Ng6, ...Be7, ...Nd7.

Yes, my idea Nc1, Ra2, Ba1 wont work against that setup. But i still dont believe black can win that, the position is too closed. So i found a better setup: Nd2,Qf2,Kg2,Rg1, Kf1-e1. The g3 idea (on gxh4) is then at best a draw for black. And if he plays Nd7-f8-g6xh4, white also seems to defend:



I dont see how to continue here with black. Fish wants to play pawn to h3 and then exchanges his last N and black squared bishop against blockeurs on g3/h2, which is a well known type of fortress which computers dont understand.

But the alternatives, N to f3 or pawn to g3 also wont win, white sacrifices back the piece on f3 or g3 and successfully defends.

I still do not know. In the above line instead of 26...Nxh4 it might be better 26...Bxh4.
Black does not have to sacrifice 23...Nxh4 right away : he can make the preparatory 23...Ndf8 and maybe also 24...Ra7 or 24...Kd7 first. Black does not always have to sacrifice ...Nxh4: the possibility ...Bxh4 is open as well.
The sacrificed material does not matter that much: white plays like 2 bishops down anyway, hence opening the position and using the pawns seems like the only way to win.

@impruuve I was thinking of a similar line to what you made here. However I don't think you need to rush it like that. I'd have taken time to move both rooks over so everything is in play.