This is usually White's plan. The queen is transferred to f3 to support a knight jump to f5. The bishop on c1 is also dangerous targeting h6.

Gaining more space. The bishop on c2 will remain passive for a long time. The pawn on d3 is now backward and the c2-bishop has to guard it. A possible plan is to take on c3 followed by ...b4 to gain full control over the d4-square.

Now there are several ways to play with the black pieces, but I really love the way Kollars plays in this game. It is a fantastic positional idea that is employed to kick the dangerous f5-knight. We want to play ...g6, but of course, h6 would be hanging. Therefore the idea is to overprotect h6 by playing ...Kh7 followed by ...Ng8! and then ...g6.

There we go!

And remember! ...dxc3 followed by ...b4 is strong in these positions to secure the d4-square!

Black intends to play ...b5 or ...Na4. How to proceed?
14.Rb1!

Threatening b4.

Finishing development.

16...Qd8 17.Qd2 Nxc3 18.Nxc3 a6 19.g4 +/-

Vallejo keeps winning space and choking his opponent's pieces. Next, White will connect the rooks and then double them on the c-file with O-O, Rfc1, Rc2, and Rbc1.

This is the key! Using the fact that Black did not complete development, Black cannot protect the pawn and is forced to push it. Therefore White manages to create a weak square on c4 which is extremely tasty for a knight. Note that this works because taking on e4 will favor White thanks to tactics.