Groseibl,Ron (1723) - Mendez,George (1710) [B31]
DCM Fall Quads, 11/1/2001
B31: Sicilian: 2...Nc6 3 Bb5 g6 Notes by [Fritz 5.32 (60s)] and Ron Groseibl
1.e4 c5 2.Nf3 Nc6 3.Bb5 g6 4.0-0 Bg7 5.Re1 e6 Although playable, this move weakens
the dark squares on the kingside. Black must now be careful to protect these squares.
Another option is 5...e5 6.Bxc6 dxc6 7.h3 Qe7 8.d3 Nf6 9.Be3 0-0 10.Nbd2 Nd7 11.a4
Rd8 12.Nb3 b6 13.a5 Ba6 14.Ra3 c4 15.axb6 axb6 16.Qa1 cxb3 17.Rxa6 Rxa6 18.Qxa6
bxc2 19.Rc1 c5 20.Rxc2 Markovic,M-Zontakh,A/Sabac 1998/CBM 65/[Rogozenko]/1-0
(43) 6.c3 Nge7 7.d4 Qb6N [7...cxd4 8.cxd4 Qb6 9.Bxc6 dxc6 10.b3²] 8.Bxc6 Nxc6
[8...dxc6 9.dxc5 Qxc5 10.Be3±] 9.dxc5 Qxc5 10.Be3 Qb5 [10...Qh5 11.Qd6²] 11.Qc2
[11.Na3 Qh5± (11...Qxb2? doesn't work 12.Nc4 Qxc3 13.Rc1+-) ] 11...0-0= 12.Na3 Qh5
13.Rad1 I wanted to discourage d5 with the idea of eventually playing Nc4, Nd6. b6
Covers c5 [13...f5 14.Bc5 fxe4 15.Bxf8 exf3 16.Bd6²] 14.Nc4 [14.Qa4 a6²] 14...Rd8
[14...d5!? 15.Ncd2 Bb7²] 15.Nd6± The occupation of the dark squares begins. My goal
now is to exchange off all of black pieces which could defend these squares.
15...Ba6 16.Qa4 White gets the initiative 16...Qa5 17.Qxa5 Nxa5 18.Bd4 Bf8 [¹18...f6!?²
is an interesting idea] 19.Bf6± Rdb8 [19...Bxd6 20.Rxd6 Nb7 21.Rd2±] 20.Ne5+- The
occupation is complete. Now black is forced to exchange his last defender - the dark
squared bishop.
20...Bxd6 21.Rxd6 Nc4 [21...Bb5 22.Nxd7 Nc4 23.Nxb8 Nxd6 24.Rd1+-] 22.Rxd7 Nxe5
23.Bxe5 Rc8 [23...Bb5 24.Rdd1 Rb7 25.Bf6+-] 24.Red1 Bb5 25.R7d6 Kf8 [25...f5
26.Rxe6 fxe4 27.Re7+-] 26.Bf6 Now white clamps down on the d8 square. Ke8 27.f3
Preparing for the centralization of the king before the breakthrough. I was not sure at this
point whether I would break on the kingside or queenside. I considered both possibilities
while I moved the king into position. Ba6 [27...Bc6 28.Kf2+-] 28.Kf2 h6 29.Bg7 [29.a4
Bc4+-] 29...h5 [29...Rd8+-] 30.Bf6 Bb5 Black really has no constructive moves to make
and awaits his fate. 31.Ke3 Bc4 32.b3 Bb5 33.c4 Bc6 34.h3 Rab8 [34...b5 35.g4+-]
35.g4 White breaks on the kingside. h4 [35...Kf8 does not help much 36.gxh5 Be8 37.hxg6
fxg6 38.Rxe6+-] 36.Bxh4 [36.e5 might be the shorter path 36...g5+-] 36...Kf8 37.Bf6 Kg8
[37...b5 doesn't improve anything 38.h4+-] 38.h4 [¹38.g5 and the rest is a matter of
technique 38...e5 39.Rg1 Re8 40.Rxc6 Rbc8+-] 38...Be8 39.Kf4 [39.h5!? and White can
already relax 39...b5 40.g5 bxc4 41.bxc4 Rb4+-] 39...b5 40.Rd8 [40.R1d4 makes it even
easier for White 40...bxc4 41.bxc4 Rc5+-] 40...bxc4 41.bxc4 Kf8 [41...Rxd8 42.Bxd8 f5
43.Bg5+-] 42.R1d7 [¹42.Rxc8!? might be the shorter path 42...Rxc8 43.h5 gxh5 44.gxh5
Kg8+-] 42...Rxd8 43.Rxd8 Do you see the mate threat? 43...Rb4??
the pressure is too much, Black crumbles [¹43...Rxd8 44.Bxd8 f5+-] 44.Rc8 [44.h5 seems
even better 44...gxh5 45.gxh5 Rb1+-] 44...Ra4 45.h5 gxh5 46.gxh5 Rxa2 47.Kg3
Preventing the rook from reaching the h file. Ra5 48.c5 Ra6 [48...Rb5 cannot undo what
has already been done 49.e5 a5 50.c6+-] 49.h6 Kg8 50.Rxe8+ Kh7 51.Bg7 [51.Rc8
keeps an even firmer grip 51...Kxh6 52.c6 Kg6+-] 51...f6 [51...Rc6+- the only chance to
get some counter play] 52.Rc8 Ra2 53.c6 Rc2 54.c7 Kg6 55.Bxf6! Clearance to allow c8-g8[55.Bxf6 Kxh6 56.Be5+-] 1-0