The upside of this exchange for White is that Black is left with a scattered pawn formation on the K-side. However, White's own formation wants time to consolidate. She is right I think at this point to refrain from 21.Rxe6.

Threatening 23.g5.

This bishop's redeployment has been on the cards for quite some time - the moment it moved to c3, withal. Threatens Rc3, but also expresses an interest in an attack by 26.gxh6 gxh6 27.Rxe6!? Bxe6 28.Rxe6 Rxf3 29.Rxg6ch Kf7 30.Rxc6 ... or something similar.

Unfortunately, the otherwise desirable 27.Ne5 is not quite playable on account of leaving the f2-pawn insufficiently attended.

Possibly 29...Bf4 at once was an improvement?

The alternative line was 31...Bxd2 32.Nxd2 Bxg2 33.Kxg2 Rxg5ch 34.Rg3, with perhaps a slight edge for White.

I am really enjoying the translation into English; most entertaining. What nataliajessica was saying is this: 'I have a knight against bishop (I think this should read 'bishop against knight'), and the better pawn structure. The position is simple ... occupy the e-file with the rook, bring the King to the Queen's side, and force the Knight into defending the pawns on their white squares!' I'm not quite sure why Black should suppose White has an engine assisting her, as the plan is obvious and straightforward enough.

When questioned about using an engine I think the game is human vs human. A unjustified question to ask, as it is not allowed, and the person would be acusing the other player to be a cheater.