2013 Pan American Intercollegiate Chess Championships

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(1) Boros,Denes - Yotov,Valentin [B22]
Pan American InterCollegiate, 28.12.2013

1.e4 c5 2.Nf3 e6 3.c3 d5 [3...Nf6 4.e5 Nd5 5.d4 cxd4 6.cxd4 d6 7.Bc4 Nc6 8.0-0 Be7 9.Qe2 0-0 10.Nc3 Nxc3 11.bxc3 dxe5 12.dxe5+/= With dangerous attack for white.] 4.exd5 [4.e5 d4?! (4...Nc6 5.d4 Bd7 ...translates into French Defense.) 5.Bd3 Bd7 6.Qe2 Bc6 7.Be4 Bxe4 8.Qxe4 Nc6 9.0-0 Nge7 10.c4 h6 11.d3+/- 1-0 Kamsky,G (2729)-Svidler,P (2727)/Dresden GER 2008] 4...exd5 5.d4 Nf6 6.Bb5+ Bd7 7.Bxd7+ [7.Qe2+ Be7 8.dxc5 0-0 9.b4 Re8 10.Bxd7 Nbxd7 11.Be3 a5 12.0-0 Ng4 black has more than enough compensation for the pawn. 13.Rd1 Bf6 14.Rxd5 Nxe3 15.fxe3 axb4 16.Qd3 Re7 17.Nbd2 bxc3 18.Ne4 Qc7 19.Nd4 Rxe4 20.Qxe4 Nxc5 21.Qc2 Ne6=/+ ] 7...Nbxd7 8.0-0 Be7 9.dxc5 [9.Qb3!? b6 (9...Rb8 10.Bf4 c4 11.Qa4 Ra8 12.Re1 0-0 13.Nbd2@ ) 10.Re1 0-0 11.Bf4 Re8 12.Nbd2 Nh5 (12...Nf8 13.Be5 Ne6 14.Nf1+/= ) 13.Bg3 Nxg3 14.hxg3 Nf6= ] 9...Nxc5 10.Be3 [10.Nd4 0-0 (10...Qd7 11.Qf3 Nfe4 12.Nf5 Bf6 13.Nd2 0-0 14.Nxe4 dxe4 15.Qg4 Rfd8 16.Be3+/= ) 11.Nf5 Re8 12.Nxe7+ Qxe7 13.Be3 b5 14.Nd2 b4 15.cxb4 Ne6 16.Nb3 Qxb4= ] 10...0-0 11.Nbd2 Re8= 12.h3 Qc7 This is one of the more critical positions so far. Black must take control of the center while exchanging the least amount of pieces. 13.Nd4 a6 14.Rb1? It is a complete waste of time. The pawn on "b2" remains unthreatened. [14.Nf5 Bf8 15.Bd4 Nfe4 16.Re1 g6 17.Ne3 Rad8 18.b4 Nxd2 19.Qxd2 Ne4 20.Qc2 Qc6@ ; 14.Qc2 Bd6 15.Nf5 Bh2+ 16.Kh1 Bf4 17.Rad1 g6 18.Bxf4 Qxf4 19.Ne3 Rad8 20.Kg1 d4 21.cxd4 Ne6 22.Nf3 Nxd4 23.Nxd4 Rxd4 24.Rxd4 Qxd4= ] 14...Nce4?! Slightly premature. [14...Rad8 15.Nf5 Bf8 16.Bd4 Nfe4 17.Nxe4 dxe4 18.Nh6+ Kh8 19.Qh5 Rd7 20.Rfd1 Nd3=/+ ] 15.N2b3?! Without any control over the important squares in the center, it will be very difficult for white to create any reasonable threats. [15.Nxe4 dxe4 16.Qb3 Bc5 17.Rbd1 Rad8 18.Bg5 Qe5 19.Bxf6 Qxf6 20.Qxb7 Bxd4 21.cxd4 Rxd4 22.Rxd4 Qxd4= ] 15...Rad8 16.Nf5 Bf8 17.Qf3?! [17.Re1 Nd7! 18.Qc2 Qe5 19.Nfd4 Bd6 20.Nf3 Qh5 21.Rbd1 Ne5 22.Nbd2 Bc7 23.Nxe5 Qxe5 24.Nf3 Qe6= ] 17...Nd7 18.Bd4 Nb6 [18...Ne5?! 19.Qf4 Bd6 20.Nxd6 Qxd6 21.Bxe5 Rxe5 22.Nd4= ] 19.Qg4 [19.Nd2! Re6 (19...Nxd2? 20.Nh6+ Kh8 21.Qxf7 Qxf7 22.Nxf7+ Kg8 23.Nxd8 Nxf1 24.Rxf1 Nd7 25.Nxb7 Rb8 26.Na5 Rxb2 27.Ra1 Bc5 28.Nc6+/= ; 19...g6 20.Qe3 Nc5 21.Nh6+ Bxh6 22.Qxh6 Ne6 23.Nf3 Nxd4 24.cxd4+/= ) 20.Rbd1 Nc4 21.Nxe4 dxe4 22.Qe2 Rd5 23.Ne3 Nxe3 24.Bxe3 Qd7 25.Bd4 g6=/+ ] 19...Re6 20.Rfe1 [20.Rbe1 ] 20...Rg6 21.Qf3 Nc4 22.Nh4 [22.Re2 Ng5 23.Qh5 Ne6 24.Be3 Nxe3 25.fxe3 Rf6 26.Nfd4 g6 27.Qh4 Be7 28.Qe1 Ng5-/+ ] 22...Re6 complete center domination. 23.Qd1 [23.Qd3 ] 23...Rde8 24.Qh5 [24.Nf5 Qd7 25.Ne3 Rg6 26.Qh5 Rg5 27.Qh4 Be7 28.Qf4 Bd6 29.Qh4 Qe7 30.Ng4 f6!-+ ] 24...Qd8 [24...Qd7 ] 25.Nf3 g6 26.Qg4 [26.Qh4 Qd6 ...h5 is next, and the white queen's days are over.] 26...Bd6?!(+) It can be a difficult task to avoid mistakes when in time trouble. [26...Qc7! ] 27.Qh4 Qxh4 [27...Qc7 28.Qh6 f6-/+ ] 28.Nxh4 a5 29.a4 Rb8? [I was thinking to play this move during the game. However, I did not have the time to calculate it properly and reach a satisfying conclusion. 29...b5! 30.axb5 a4 31.Na1 Ned2 32.Rxe6 fxe6 33.Rd1 Rb8 34.Be3 Ne4 35.b3 axb3 36.Nxb3 Nxc3 37.Ra1 Rxb5-+ ] 30.Be3 [30.Ba7 Rbe8 31.Nd4 R6e7 32.Nb5 Ned2 33.Rxe7 Rxe7 34.Ra1 Be5-/+ ] 30...Nxe3 31.Rxe3 Nc5? [31...Bf4 32.Ree1 Rb6 33.Nxa5 Nd2 34.Rbd1 Rxb2 35.Nf3 Nxf3+ 36.gxf3 Rc8-/+ ] 32.Nxc5 Bxc5 33.Rxe6 fxe6 34.Re1 [34.Ra1! b5 35.axb5 Rxb5 36.Ra2 e5 37.Nf3 e4 38.Ne5 a4 39.Kf1 Kg7 40.c4 dxc4 41.Nxc4 Rb4 42.Ne3 Bxe3 43.fxe3 Kf6=/+ ; 34.b4 axb4 35.cxb4 Bd6 36.Nf3 Ra8 37.a5 h6=/+ ] 34...b5 35.axb5 Rxb5 36.Re2 d4! by opening the center, the bishop automaticly dominates the knigh on "h4". However, black's main resource to win is the pawn on "a5". 37.Rxe6?? [37.cxd4 Bxd4 38.Nf3 Bxb2 39.Rxe6 a4 40.Ra6 a3-/+ ] 37...d3!-+ 38.Nf3 [38.b4 axb4 39.cxb4 d2 40.Re8+ Kf7 41.Rd8 Rxb4 42.Rxd2 Rxh4-+ ] 38...Rxb2 39.Re8+ Kg7 40.Rd8 a4 41.Ng5 Bxf2+ 42.Kh2 a3 43.Rxd3 a2 44.Rd7+ Kf6 45.Ne4+ Ke6 46.Rd1 Rb1 47.Rd6+ Ke5 48.Ra6 a1Q 49.Rxa1 Bg1+ 0-1

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