(4) Zimmerman,I - Matz [D35]
Berkeley Chess Club Berkeley, CA (3), 19.03.2004

1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.cxd5 exd5 5.Bg5 Be7 6.e3 Nbd7 7.Bd3 Diagram

7...b6
[ 7...c6 8.Qc2 Nh5 9.Bxe7 Qxe7 10.Nge2 g6 11.h3 Ng7 12.Nf4 Nf6 13.g4 g5 14.Ng2 h5 15.0-0-0 Be6 16.Qa4 a6 17.Qa5 Qd8 18.Qb4 Qc7 19.Na4 a5 20.Qc3 hxg4 21.hxg4 0-0-0 22.f3 Kb8 23.Nc5 Bc8 24.Bc2 Ne6 25.Nd3 Qg3 26.Rxh8 Rxh8 27.Nge1 Qc7 28.b4 axb4 29.Nxb4 Ne8 30.Qb2 Qb6 31.Ned3 Nd6 32.Ne5 Kc7 33.Qc3 Kd8 34.e4 Nf4 35.Qc5 Kc7 36.Nxd5+ Nxd5 37.exd5 f6 38.Qxd6+ 1-0 Timman,J-Lobron,E/Sarajevo 1984/[(SB/194-21) Timman]

(38); 7...Nf8 8.f4 c6 9.f5 Ne4 10.Bxe7 Qxe7 11.Qf3 Qb4 12.Bxe4 Qxb2 13.Nge2 Qxa1+ 14.Bb1 Nd7 15.0-0 Qb2 16.Qg3 Qa3 17.e4 dxe4 18.f6 g6 19.Qf4 Nb6 20.Bxe4 Be6 21.Rf3 Rd8 22.Qc7 Qd6 23.Qxb7 0-0 24.Qxc6 Bc4 25.Qc5 Rfe8 26.Rf4 Qxc5 27.dxc5 Nd7 28.c6 Nc5 29.Bf3 Bxe2 30.Nxe2 Rd1+ 31.Kf2 Nd3+ 32.Kg3 Nxf4 33.Nxf4 Rd6 34.c7 Rc8 35.Nd5 Rxd5 36.Bxd5 Rxc7 37.Kf4 Rc2 38.a4 Rc5 39.Ke5 Ra5 40.Kd6 Kf8 41.Bc6 Rf5 42.Kc7 Rxf6 43.a5 0-1 Beliavsky,A-Ljubojevic,L/Linares 1989/[NiC YB\13-88 (Beliavsky)] (43)]

8.Nge2 Bb7 Diagram

9.0-0

 [ 9.Qc2 Rc8 10.0-0 c5 11.Bxf6 Nxf6 12.Bf5 Rc6 13.e4 dxe4 14.Rad1 0-0 15.dxc5 Qa8 16.cxb6 Rxb6 17.Ng3 Ba6 18.Rfe1 Bd3 19.Qc1 Bb4 20.Qg5 Re8 21.Qh4 Bxc3 22.bxc3 g6 23.Qh6 Qc6 24.Re3 Rb2 25.h3 Qa4 26.Rc1 Qxa2 27.Bxg6 Rxf2 28.Bxh7+ Nxh7 29.Ne2 Rxg2+ 30.Kxg2 Re6 31.Rg3+ Rg6 32.Rxg6+ fxg6 33.Qxg6+ Kh8 34.Qe8+ Kg7 35.Kh1 Bxe2 36.Rg1+ Kf6 37.Qh8+ Kf5 38.Qxh7+ Kf4 39.Qh4+ Ke3 40.Qg5+ Kd3 41.Kh2 Bf3+ 42.Kg3 Qf7 43.Qb5+ Kd2 44.Qe5 Ke2 45.Qb5+ Kd2 46.Qc5 Qg6+ 47.Kf2 Qb6 48.Qxb6 axb6 49.Rb1 Bd1 50.Rxd1+ Kxd1 51.Ke3 Kc2 52.h4 b5 53.h5 Kxc3 54.h6 1-0 Gual Pascual,A-Rosich Valles,A/Barbera 1999/EXT 2001 (54)]

9...0-0 10.Rc1 [ 10.Qd2 Re8 11.f3 h6 12.Bh4 c5 13.Rae1 a6 14.Bf2 c4 15.Bb1 b5 16.Ng3 b4 17.Nce2 a5 18.e4 dxe4 19.fxe4 Bf8 20.e5 Nxe5 21.Rd1 Neg4 0-1 Kawenski,L-Stefanik,M/Krynica 2001/EXT 2003 (21)] 10...Re8 11.a3 c5 12.Bb1 Rc8 13.dxc5 Nxc5 14.Nf4 Nce4 15.Bxf6 Nxf6 16.Ba2 Qd7 17.Nfxd5 Qf5 18.e4 Diagram

18...Qg6 [ 18...Nxe4 19.Nxe4 Qxe4 20.Rxc8 Rxc8 21.Re1 Bxd5 22.Rxe4 Bxe4] 19.Nxe7+ Rxe7 20.f3 Ree8 21.Qe2 Rcd8 22.Rcd1 Nh5 23.Qe3 [ 23.Rxd8 Rxd8 24.f4 Re8 25.e5] 23...Qf6 24.g3 Qe7 25.Rxd8 Rxd8 26.Rd1 Diagram

26...Nf6

[ 26...Rxd1+ 27.Nxd1 Qd6 28.Nf2
  ( 28.Qb3 Nxg3 29.hxg3 Qxg3+ 30.Kh1 ( 30.Kf1? Ba6+) 30...Qh3+ 31.Kg1 Qg3+ 32.Kh1=)
     28...Nxg3 29.hxg3 Qxg3+ 30.Kh1 h5 31.Bc4 h4 32.b4 h3 33.Bf1 h2 34.Nh3 Bc8 35.Nf4]

27.Rxd8+ Qxd8 28.e5 Ne8 29.e6 fxe6?
  [ 29...Kf8 30.exf7 Nd6; 29...Nd6 30.exf7+ Kf8 31.Qf4 g5]
30.Qxe6+ black resigned in view of 30...Kh8 31.Qg8# 1-0