Both players believed that the capture...

was impossible. In the game, Black retreated with 22...Qb4, and after 23.Nd3 Qe7 24.Bc1!, White retained the advantage of the two bishops, which he confidently realised.
It seems that after...

the threat of Nc1-a2 is irresistible, but there is the unexpected...

The slumbering rook bursts into the game with great effect. Now, after any jump by the knight, Black wins with ...Ra6- b6. White has to play 25.d5, but Black has a clear advantage, as the exchange is the exchange.

Preparing the advance of the a-pawn is problematic, as the black queen stands in the way. Suddenly, Black instead activates his most passive piece, which seemed to have no particular prospects:

Shocked, White chooses the path of least resistance and loses quickly. It was essential to give the king some air with 24.Rcd1.
Incidentally, it is bad to play 24.Bxb5 axb5 25.Rcd1 Ra8 – Black’s attack develops of its own accord.

There is no defence to the rook’s transfer to the b-file. White resigned.

The black minor pieces are hanging, but White’s queen prevents him from taking them. At first glance, the queen has no good retreat squares. If it goes to g3, his own rook is pinned, whilst after 23.Qf2, Black has 23...Bh3!, and on 23.Qg2 Qe3+, there is the same idea of ...Bg4-h3.
It did not occur to the Chinese player to retreat the queen away from all attacks by means of 23.Qh1!!, which immediately wins a piece.
In the game, after...

White retained the advantage, although he eventually lost.

For the piece, White has three pawns and a serious initiative, so the advantage is on her side. But it is another matter how to develop this initiative. The black king is vulnerable, and her pieces are poorly placed, with the exception of the queen and the Nf5, which cover entry squares in her camp. The white Rh3 does not yet take part in the attack and her king on f1 is also badly placed, being better on a dark square nearer the corner. There is no forcing way to win. Thus, we use the method of exclusion, looking for a way to improve the worst placed piece. The most energetic, strong and tempo-gaining move is: