Ivanchuk, Vassily - Ni, Hua
Moscow Aeroflot op-A
[2005.02.21]
[B33l]

1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Ndb5 d6 7.Bg5 a6 8.Na3 b5 9.Nd5 Qa5+ 10.Bd2 Qd8 11.Bd3

[ 11.Nxf6+ ]
[ 11.c4 ]
11. ... Nxd5 12.exd5 Ne7 13.c4 g6
[ 13. ... bxc4? 14.Nxc4+/- ]
14.cxb5 Bg7 15.O-O A better pawn structure and open files for his pieces provide Black with sufficient compensation for the pawn.
[ 15.bxa6 O-O 16.Nb5 Bxa6
[ 16. ... Nxd5 17.O-O
[ 17.Be4 Bxa6! 18.Bxd5 Bxb5 19.a4 Ba6 20.Bxa8 Qxa8=/& ]
17. ... Bxa6 18.Qb3 Nf4 19.Bxf4 exf4 20.Rfd1 Rb8 21.a4 Be5~
[ 21. ... f3 22.g3 ]
[ 21. ... Qf6 22.Rab1 h5 23.Qa3 Bb7 24.Nxd6 Ba8+/- 1-0 Lanka,Z-Huschenbeth,N/Hamburg 2005 (33) ]
]
17.a4 Rc8 18.O-O Nxd5 19.Qb3 Nf4 20.Rfd1 Nxd3 21.Qxd3 Qh4 22.Qxd6 Bb7 23.Qb6 Ba8 24.h3 Rc2 25.Qe3 Rxb2 26.Nc7 Bb7 27.a5 f5 28.a6 f4 29.Qc5 Bxg2 30.Kxg2 f3+ 31.Kh2 Rc2 32.Qb6 e4 33.Be3 Rxf2+!
[ 33. ... Be5+? 34.Kg1 Bxc7? 35.Qe6+ Rf7 36.Rd7+- 1-0 Polgar,J-San Segundo Carrillo,P/Madrid 1994 (38) ]
34.Bxf2 Be5+ 35.Kg1 Qg5+ 36.Kf1 Qg2+ 37.Ke1 Bc3+ 38.Rd2 Qh1+ 39.Bg1 f2+ 40.Qxf2 Rxf2-+ ]
15. ... O-O 16.Bb4N Ivanchuk correctly wants to organize pressure on d6. White must not let Black to develop freely his initiative.
[ 16.Bc4?! f5
[ 16. ... e4!? ]
17.Qe2
[ 17.Bg5 h6 ]
17. ... f4 18.f3 Nf5 19.Nc2? Ng3! 20.hxg3 fxg3-+ Korneev-Sriram/Ubeda 2001 ]
16. ... a5
[ 16. ... f5? 17.Nc4 Nxd5 18.Nxd6!
[ 18.Bxd6 Re8~ ]
18. ... Be6
[ 18. ... Nxb4? 19.Bc4++- ]
19.Bc4 Nf4 20.Bxe6+ Nxe6 21.Qd5+/- ]
[ Serious attention deserved 16. ... Nxd5 17.Be4 Nxb4 18.Bxa8 d5=/& [%csl Ra8][%cal Gc8e6] ]
17.Bc3 Nxd5
[ According to M.Notkin correct was 17. ... f5 "though with the bishops on c3 and d3 White is much better equipped to meet the plan carried out by Sriram (see 16.Bc4 - DR) since f5-f4 gives the e4 square to the light-squared bishop while after e5-e4 the dark squares in the Black's camp would be weakened. Nevertheless Black has useful moves at his disposal (Bb7, Rf7, Rc8) and the central advance can wait until an opportune moment as White needs time to regroup for active operations" (M. Notkin) Everything is right, only that I believe that 17...Nxd5 also offers Black enough possibilities for counterplay. ]
18.Qf3
[ 18.Be4 Nxc3 19.bxc3 Rb8~ ]
18. ... Nb6? Black wants to advance the d-pawn, but unfortunately for him the concrete play favors White.
[ 18. ... Be6 19.Be4 Nxc3 20.Bxa8 Qxa8
[ 20. ... Nxa2!? 21.Bd5 Bxd5 22.Qxd5 Nb4=/& ]
21.Qxc3
[ 21.Qxa8?? Ne2+ ]
21. ... d5=/& ]
[ 18. ... Bb7!? 19.Be4 Nxc3 20.Bxb7 e4 21.Qe3
[ 21.Bxe4? Nxe4 22.Qxe4 Bxb2-+ ]
21. ... Rb8 22.bxc3 Rxb7 23.Qxe4
[ 23.Rad1 Re8!
[ Better than 23. ... d5 24.c4 Rd7 25.c5+/- (M.Notkin) ]
24.c4 Qc7~ [%csl Ra3] 25.Rd5 f5 26.Rfd1 Be5=/& ]
23. ... d5 24.Qf3 Qe7
[ 24. ... Qd6 25.Nc4! ]
[ 24. ... Rc7!? 25.Rac1 Qd6 26.Nb1 Rb8 27.a4 Rc4 28.Rfd1 Rd8?? ]
25.Qxd5
[ 25.Nc2 Rxb5 ]
25. ... Rfb8=/& [%cal Gg7f8] ]
19.Nc4!
[ 19.Be4? d5-/+ ]
19. ... Be6
[ 19. ... Nxc4 20.Qxa8+- ]
20.Bxa5!
[ 20.Nxb6? Qxb6-/+ ]
20. ... Bxc4
[ Probably Black should have tried his chances in the following variation: 20. ... Rxa5 21.Nxa5 d5 although after 22.Nc6 White has good pieces and Black's compensation is not sufficient. ]
[ 20. ... e4!? 21.Bxe4!
[ 21.Bxb6 exf3 22.Bxd8 Rfxd8 with some compensation ]
[ 21.Qxe4? Bxc4 22.Bxb6 Bxd3-+ ]
21. ... Bxc4 22.Bxb6
[ 22.Bxa8 Qxa8 23.Bxb6 Qxf3 24.gxf3 Bxf1 25.Rxf1 Rb8
[ 25. ... Bxb2 26.Bc7+- ]
26.Bc7 Rxb5 27.b3+/- ]
]
21.Bxb6 Qxb6 22.Bxc4 A pawn up and a better bishop secures White a huge advantage. Ivanchuk easily converts it into a full point. 22. ... Rac8 23.Qb3 e4 24.a4 Bd4
[ 24. ... Qa5 25.b6? ?
[ 25.Bd5! +- ]
25. ... Rc6! ]
25.a5 Qc5 26.Bd5+- Rce8 27.Qc4 Qxc4 28.Bxc4 Re5 29.b6 Rc5 30.Ra4 d5 31.Be2 Be5 32.a6 Rc2 33.a7
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