Black has tremendous play for the exchange. ...d5 can neutralize the bishop on b3 for good.
A positional exchange sacrifice. White tries to bury the black light-squared bishop and activate the d3-bishop.
1.Rbb1? a very natural move and the one White played in the game but after 1...c5! Black opens the diagonal, and the bishop becomes a monster! Black consolidates the advantage and Salgado went on to win this game.
The knight finds a nice route via b3 and c5, putting a lot of pressure against e6, and with this along with the possibility of pushing the pawn to a5 to reinforce the b6-pawn, the exchange is more than compensated for!
Dual purpose. First of all, it attacks the rook with tempo; second, it blocks the diagonal for the queen, which is now very passive.
A very strong move, supporting the d6-square, where White plans to place a rook!
Capping the d-file and the e7-bishop. If Black captures the rook, White gets a protected passed pawn and a lethal bishop on the main diagonal!
23...Bxd6?! 24.Ng5! g6 25.exd6 with a decisive advantage! Look at that bishop on b2!