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Second part of the analysis that the international master Ramón Huerta soris, technical director Edarays makes about starting with black beats Grandmaster Manuel Leon Hoyos Yucatan Swedish GM Emanuel Berg: 

15.e4 

Always order more elastic. Both plays e4 and f4 are associated with a decision White: throw and attack majorities, but still always have to deal with the elasticity, which is a guiding principle in the strategic and tactical use of time with masterly precision. 

Now Black must also make decisions about whether to continue with the approach to counter the attack of the white majority, by the time gain by sacrificing material. In this case it is up making the right play to continue with the idea. 

15 ... d7! 

This is the exact move for the foregoing purposes. The alternative was 15 ... c4, but the text is much better. 

16.f4? 

The white evaluated poorly counter the black and allow. The right thing would have been to play 16.g4. Then the game could have continued: 11 ... b5! (11 ... Nf6? 12.g5 Ch5 and then another with white 13.f4 strategy would be successful) 12.ab ab 13.Cab5 14.Cb5 Rb5 15.gh Bb5 16.Qe2 Nc4 and position is extremely uncertain, but the possibilities are equivalent. 

16 ... Ng3 17.fe 

Probably if 17.Tf2, had been continued: 17 ... Cc6! 17.DC Ac6 18.e5 of 19.Dd8 Rad8 20.Rg2 Cf5, with a slight advantage of black. Regarding 17.Te1, black would have been clear advantage after 17 ... b5 18.ab ab 19.Cc2 Qh4. 

17 ... Ae5! 

In chess, sometimes deciding between two alternatives fails to complete a matter of logic and accuracy being necessary to the final finish by our excitement outside in a bit incomplete reason. Reasons is difficult to say whether or not this move is better than the alternative 1 ... Cf1, but eventually the text asks the excitement and yes you're right, it is the best move. 

18.Tf3? 

Again the uncertainty, always so beautiful and educational. You have to decide between 18.Tf2 and 18.Tf3 and here we do not advise, from the point of view of the defense side, guided by emotions as much as the previous black decision. Let's see: In defensive positions, while lower, defensive resources must be coordinated based on the following rule: 

"We must choose routes defensive generating greater technical difficulties and his human time for the top side." 

In the position Black has a strong trio of pieces (two bishops and a horse) that is his great offensive force: 

"The quality of a strong trio of minor pieces has two basic stamps given in the respective activities of different horse and bishop." 

The hardest choice for Black would have been decided differently surrender his bishop after 18.Tf2! (help here theoretical calculation rule, like any good rule: 18 ... Ne4 Ac3 -necesaria- 19.bc 20.Ae4 Re4 21.Df3 22.Af4 Df6 f5 and black advantage is minimal or perhaps zero). 

18 ... b5 19-ab ab 

The advantage of black is already clear. 

20.Ae3? 

It is very difficult to defend in chess, but it was worth trying to complicate although it may, as in this case, accelerate the deterioration of the defensive position on an exact match of the attacker as happens here. 

20 ... f5! 21-Rg3 

(The black is already decisive advantage and alternative 21.ef not change that assessment, after 21 ... Cf5 22.Af2 Ch4). 

21 ... g3 22.Df3 Qh4 

(More accurate was 22 ... h4 idea 23.Cb1 !; with 24 ... b4 Te4- +). 

23.ef b4 Rf8 24.fg 25.gh Kh8 26.De4 27.Dh4 bc cb ba = D 28.Dg3 29.Rh2 Dc3 30.Cc4 Dc4 31.Dd6 Tbe8 32.Ah6 Rf7 33.Dg6 Tef8 34.Dd6 Rfe8 35.Dg6 Qh4 36.Ad2 Tg7 37.Ac3 (0-1). 

A beautiful game of Yucatan Gran Maestro.