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Anatoly Karpov vs Alexander Ivanov
Moscow rapid (1992) (quick), Moscow RUS, rd 10, Aug-??
Queen's Indian Defense: Fianchetto. Check Variation Intermezzo Line (E15)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
Feb-22-07
Premium Chessgames Member
  kutztown46: 1 d4 Nf6 2 c4 e6 3 Nf3 b6 4 g3 Ba6 5 b3 Bb4+ 6 Bd2 Be7 7 Bg2 c6 8 Bc3 d5 9 Ne5 Nfd7 10 Nxd7 Nxd7 11 Nd2 O-O 12 O-O b5 13 Re1 bxc4

At 12-ply, Fritz 9 rates 13...bxc4 as (0.23). Rated higher are ...f5 (0.07), ...Rb8 (0.10), ...Qc7 (0.20) and ...Re8 (0.21). However, as we shall see, 13...bxc4 is not so bad.

14 bxc4 Nb6

14...Nb6 appears to not be the best choice. It leads to a slight white plus assuming correct play. An overnight (19-ply) Fritz 9 analysis rates ...Nb6 as (0.16). Best is ...Rb8 (0.00) followed by ...Qc7 (0.15). Following the ...Rb8 line, we have (all moves chosen by Fritz 9 at 10-ply or better) 15 Rb1 Rxb1 16 Qxb1 Qc7 17 Qc2 dxc4 18 Rb1 Rd8 19 Ba1 and now rated (-0.23) at 16-ply is 19...Nb6 20 Ne4 Nd5 21 Nc5 Bxc5 22 dxc5 Qa5 23 e4 Ne7. Black has no apparent worries in this line.

15 c5 Nc4 16 Nxc4. 16 e4 is better (0.21 at 12-ply).

16...Bxc4 17 Qa4 Qd7 18 e4 Bd3.

Fritz 9 prefers 18...f5 (-0.20 at 12-ply) and several other moves ahead of 18...Bd3.

19 e5 (-0.30 at 13-ply). Fritz 9 prefers exd5 (.00) or f3 (-0.02).

19...Rab8 20 Qd1 Bg6 21 Qd2 Rb7.

Fritz 9 prefers several moves to 21...Rb7. Top choice is 21...Bf5 (-0.25 at 13-ply).

22 Bf1 Rfb8

Fritz 9 prefers several moves to 22...Rfb8. Top choice is 22...Bf5 (-0.13 at 13-ply).

23 Bd3 Bd8 (23...Bxd3 is rated slightly better at 14 ply (-0.03)).

24 Kg2 (Fritz 9 prefers Bxg6 (0.05 at 13-ply)).

24...Bxd3 25 Qxd3 Rb5 26 h4 (Fritz 9 prefers Rab1 (0.01 at 12-ply)).

26...Ba5.

Fritz 9 prefers several moves to 26...Ba5. Top choice is 26...Qb7 (-0.15 at 13-ply). 26...Ba5 is likely the fatal error for black in this game.

27 Bxa5 Rxa5 28 a4 h5, and now black is in big trouble.

Summary: 12...b5 is definitely not refuted by this game. If black follows the 14...Rb8 line, a very slight advantage to black results.

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