R4 Siregar of Indonesia

3rd ASEAN Primary School Sport Olympiad
Jakarta, Indonesia
R4 Standard Event G/90
W: Ikhsan SIREGAR [INDONESIA]
B: Rhal SOL CRUZ, Jr. [PHILIPPINES]
Ruy Lopez

1 e4 e5 2 Nf3 Nc6 3 Bb5 a6 - Morphy Defense
Prior to this tournament, Rhal has encountered the Ruy only once and lost: Andador vs Sol Cruz (1-0) in Dizon Memorial Cup 2008. For this event, his first international stint, he studied the Marshall Gambit with NM Gatus. 

4 Ba4 Nf6 5 O-O
In R1, where team mates were paired, 5 Qe2 was played by Gio.

5... Be7 6 Re1 b5 7 Bb3 O-O 8 c3 d5 - Marshall Gambit

9 exd5 Nxd5 10 Nxe5 Nxe5 11 Rxe5 c6 12 d3 Bd6 13 Re1 Qh4 14 g3 Qh3 15 Re4

Anand vs Khalifman in World Championship 2000
http://www.chessgames.com/perl/chessgame?gid=1259327
Anand vs Adams, World Championship 1997
http://www.chessgames.com/perl/chessgame?gid=1014862
Ivanchuk vs Kamsky, Tilburg 1992  
http://www.chessgames.com/perl/chessgame?gid=1060341

15... Bd7
This was Kamsky's move. Khalifman played 15... Qf5 while Adams 15... Qd7.

16 Qe2 Rae8
In the middlegame, seize the open files and command them with your Rs. Logical Chess

17 Nd2

17... Rxe4?
Trading pieces lessens an attack and helps the defense. Elements of Positional Evaluation

If both sides occupy the same open file, then neither should exchange R's but should leave the exchange to the opponent so that the recapturing R or Q commands the open file. The Game of Chess
[17... Nf6 18 Rxe8 Rxe8 19 Ne4 Ng4 20 f3 Rxe4 21 fxe4 Bxg3]
If the opponent is tied up, but your immdiate threats aren't sufficient to win, bring another piece or pawn into the attack, or improve your position in other ways; then exchange into a favorable endgame. Better Chess for Average Players

18 Nxe4 Re8 19 Be3

19... Bg4?? 20 f3 +-

Result: 1-0