DE 5th Webserver Anniversary prel.

Baranowski,Tadeusz (2443) POL - Vecek,Marjan (2126) SLO
DE 5th Webserver Anniversary prel. 50, 05.04.2011

D94: Obrona Grünfelda: 4. Sf3 Gg7 5. e3
1.d4 d5 2.c4 c6 3.Sf3 Sf6 4.e3 g6 5.Sc3 Gg7 6.Gd3 0-0 7.0-0 Gg4 8.h3 Gxf3 9.Hxf3 e6 10.Wd1 Sbd7 11.b3 We8 12.Gb2 He7 13.Gf1 Wad8 DIAGRAM 1/2-1/2 Upton,IJ - Cooper,L ENGtt 2007

14.He2 [14.Wab1 a6 15.c5 e5 16.b4 exd4 17.exd4 Se4 18.a4 Gh6 19.Gc1 Gxc1 20.Wbxc1 Hg5 21.b5 axb5 22.axb5 Sdf6 23.Wa1 Wa8 Mchedlishvili,M - Kuporosov,V Moskva 1999;
  14.a4 Wc8 15.Ga3 Hd8 16.Wab1 a5 17.He2 Gf8 18.Hb2 Wa8 19.Gxf8 Wxf8 20.b4 1/2-1/2 Van Wely,L - Ivanchuk,V Wijk aan Zee 2003;
  14.Wac1 a6 (14...Sb6 15.Ga1 (15.He2 dxc4 (15...Sc8 16.He1 Sd6 17.Sa4 Sfe4 18.Ga3 Gh6 19.Sc5 Sxc5 20.Gxc5 Hd7 21.a4 a6 22.b4 Se4 23.Gb6 Wc8 Lelchuk,Z - Kuporosov,V Berlin 1995) 16.bxc4 e5 17.dxe5 Hxe5 18.c5 Sbd7 19.Sb5 Hb8 20.Sd6 We6 21.Hf3 Sxc5 22.Sxf7 Wxd1 23.Hxd1 Sce4 Sundararajan,K - Jirka,J Goa 2002) 15...e5 16.dxe5 Sfd7 17.cxd5 Sxe5 18.He2 cxd5 19.Sb5 a6 20.Sc7 Wf8 21.Gd4 Sa8 22.Sxa8 Wxa8 23.Hb2 f6 Baranov,E - Fomichenko,E Poltavskaya 2010) 15.g3 (15.Wc2 Hb4 16.He2 Ha5 17.He1 Hc7 18.Ge2 Hb8 19.Gf3 Wc8 20.Hd2 h5 21.e4 dxe4 22.Sxe4 Sxe4 23.Gxe4 Wcd8 Portisch,L - Bronstein,DI Zagreb 1965; 15.He2 Sb6 - 14 He2 a6 15 Wac1 Sb6 (15...h5 - 14 He2 a6 15 Wac1 h5) ) 15...h5 16.Gg2 Sb6 17.He2 Sh7 18.c5 Sd7 19.e4 dxe4 20.Sxe4 Sdf6 21.Sd6 Wf8 22.h4 Se8 23.Sc4 Shf6 Eljanov,P - Inarkiev,E Khanty Mansiysk 2009;
  14.Wd2 Sb6 (14...dxc4 15.bxc4 e5 16.Hd1 exd4 17.exd4 Se4 18.Sxe4 Hxe4 19.Ha4 Sc5 20.Hxa7 Se6 21.We2 Hf4 22.Wd1 c5 23.d5 Hc7 Danner,G - Volkmann,FK AUTtt 2007) 15.a4 Hc7 16.a5 Sbd7 17.cxd5 exd5 18.Wc2 Hb8 19.a6 b5 20.Sa2 Hb6 21.Sb4 We6 22.Hd1 Gf8 23.Gc3 Se4 Gerbich,VF - Chekmasov,SI ws 2009]

14...a6 [14...dxc4 15.Hxc4 Sb6 16.He2 Sfd5 17.Wac1 e5 18.dxe5 Gxe5 19.Sxd5 Sxd5 20.Gxe5 Hxe5 21.Hd2 Furman,SA - Bagirov,V Leningrad 1963]

15.Wac1 [15.a4 Sb6 16.Hc2 Sc8 17.Ga3 Sd6 18.Wab1 h5 19.Ge2 Hc7 1/2-1/2 Dzevlan,M - Engqvist,T Stockholm 1999]

15...Wc8 [15...h5 16.Sb1 (16.Hc2 Sh7 (16...Sb6 17.Gd3 Sc8 18.Sb1 Sh7 19.Ga3 Hc7 20.Sd2 Sb6 21.Sf3 Sd7 22.Gb4 Shf6 23.Gc3 Sh7 24.Ge1 Wc8 25.b4 Kortschnoj,V - Petrosian,TV Velden 1980) 17.e4 dxe4 18.Hxe4 Shf6 19.He3 e5 20.d5 cxd5 21.Sxd5 Sxd5 22.Wxd5 e4 23.Gxg7 Kxg7 24.c5 Sf6 25.Wxd8 Onischuk,A - Akobian,V Saint Louis 2010) 16...Sb6 17.Sd2 Hc7 18.Sf3 Sfd7 19.c5 Sc8 20.Gc3 Se7 21.Hd2 Hb8 22.Hb2 Sf5 23.Se5 Gxe5 24.dxe5 Hc7 25.b4 Zentko,L - Bosak,Z corr 1984;
  15...Sb6 16.Hc2 Sc8 (16...Hc7 17.Sb1 Wc8 18.Sd2 Sbd7 19.Sf3 Wed8 20.a4 Se4 21.b4 Hb8 22.Gd3 f5 23.He2 Hd6 24.b5 axb5 25.axb5 Gagarin,V - Engqvist,T Stockholm 2005) 17.Sa4 Se4 18.Sc5 Scd6 19.Sd3 Sf5 20.Se5 Hg5 21.Sf3 He7 22.Gd3 Sed6 23.Ga3 Hf6 24.He2 h5 25.g3 Fraczek,D - Orzech,D Chotowa 2007; 15...Sb6 16.Hf3+/= ]

16.a4 DIAGRAM [16.Wc2 Wc7= ] 16...Wed8 [16...a5 17.Wd3= ] 17.g3 [17.Hc2 a5= ] 17...Se4 [17...h5 18.Wd3= ] 18.Sxe4 [18.Gg2 Sdf6= ] 18...dxe4 19.He1 [19.Hc2 f5= ] 19...h5 [19...Gh8 20.Wc2= ] 20.Wb1 [20.Gg2 f5= ] 20...h4= 21.g4 [21.Gc1 Sf8= ] 21...Sf8 [21...Wa8 22.Kg2= ] 22.Gg2 [22.Gc3 Sh7= ] 22...f5 23.Kh1 [23.He2 We8= ] 23...Sh7 24.gxf5 [24.He2 Sg5= ] 24...exf5 25.Hg1 Sg5 26.Gf1 Wd7 [26...Gf6 27.Hh2= ]

27.Hg2 [27.Ga3 Hd8= ( ‹27...Hxa3 28.Hxg5 Kh7 29.Hxh4+ Gh6 30.c5+/- ) ] 27...Kh7 [27...c5 28.Gc1= ] 28.Ge2 [28.c5 Wf8= ] 28...Se6 [28...Gf6 29.a5= ] 29.Wg1 [29.Gc1 Hf6= ] 29...Hf7 [29...Sf8 30.Wgf1= ] 30.b4 [30.c5 Sc7+/= ] 30...Gh6 31.b5 [31.c5 Sg5= ] 31...axb5 32.axb5 cxb5 33.c5 Sc7 34.Gc3 [34.Wa1 Wg8= ] 34...Wa8= 35.Gxb5 Sxb5 36.Wxb5 Wa6 37.Wb4 [37.Wa5 Wxa5 38.Gxa5 He6= ]

37...Hd5 38.Wa4 Wc6 [38...Hc6 39.Wxa6 Hxa6 40.Kh2= ] 39.Wa8 [39.Wa7 Hc4 40.Gb2 Hd5+/= ] 39...Wf6 40.Ga5 g5 41.Hh2 Gg7 42.Gc7 Wg6 43.Wb8  1/2-1/2