Annotated chess game

Black shouldn't have allowed this stunning front. True is that white opened the way for Ng4 - something that will play a role. So, maybe Nc3xe4 could have been played, with the idea of using f3 to retake ONLY is Nf6 has taken on d4. In the meanwhile, c5 would have been under white's control.

Black virtually sacrified a piece, unless he manages to make something of his lsb.

A nuisance, but no more...

...but with no harm at all.

After 14...Be3 15.Qg3 Bxc1 16.Raxc1 Ngf6 17,Rf5 White's game looks pretty good to me.

In general, black is trying to find a counterattack. It's not the time to exchange, but to try to make the most of his minor's combined force. Black wouldn't want to exchange his only active pieces!

It is hard for black to find a plan, as he just misses one piece. He tries to get it into the game. Very slow, as anything else, like h5-h4-h3. Nd-f6-Nh5 doesn't achieves much, but combined with Bc8 and f5 may be something. Everything is too slow for black. True that a5, ensuring dsb's position should have been considered.

I think I would have played Qg3 myself as the more immediately threatening.

Probably with the idea to force something on g3 after Bh4.

This kind of weakens your dark squares he is aiming for, but there is no danger, and by retreating this N will block black's pieces. Black is coming late for Bh4, g3.

Black has no space to manouver.

Enables Nf8-Ng6, but this is not much either!

It is not clear from the notes, and this is a personal view, but it seems to me White is playing this very opaquely - mesmeric gestures all across the board, leaving Black with no clear idea where the blow will fall. White seems simply to be advancing to fill the space vacated by Black. That ought to have been a warning sign right there.

... leaving White with a protected passed pawn in the centre. Not immediately useful, perhaps, but it is a long term asset, all the same.