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Anatoly Karpov vs Ulf Andersson
Match (active) (1995), Enkoping SWE, rd 1
Bogo-Indian Defense: Exchange Variation (E11)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Dec-14-04  Everett: Sweet little combo starting with 17.Nd5!

Whitehat points out on a different game between these two that Ulf Andersson, who played the Bogo-Indian 102 times in the data base, is 0-8-2 against Karpov. Eight losses in an opening this drawmaster uses more than anything else...

Mar-02-05  Rama: The position after 16. ... Nc6 would make a good daily puzzle, "White to move and win."
Mar-19-05
Premium Chessgames Member
  Gypsy: Sweet. Quite a sibling to Ulf Andersson vs Karpov, 1995 of yesterday.
Mar-19-05  minimaxing: I thought 17... Nxd5 18. Nxc6 Bxc6 19. exd5 Bb7 20. d6 Qd7 was a better defense for black.
Mar-19-05  sourcerer: so it has finally come to pass RAMA correctly guessed that this game would one day be white to play and win material
Mar-19-05  midknightblue: NAiled it! all 22 moves! ;) Well I saw the first one or two anyway :)
Mar-19-05  charms: very easy for a weekend puzzle
Mar-19-05
Premium Chessgames Member
  kevin86: The tactic here is not decisive,but with a player like Karpov,just about any advantage is decisive!
Mar-19-05  milanez: i thought it would be 17. e5 since that wins a piece as well
Mar-19-05
Premium Chessgames Member
  Swapmeet: 17. e5 can be answered by 17. ... Nxd4. I thought the answer was Nxc6 followed by 18. e5, but then black has 18. ... Qc5+
Mar-19-05
Premium Chessgames Member
  Gypsy: < minimaxing: I thought 17... Nxd5 18. Nxc6 Bxc6 19. exd5 Bb7 20. d6 Qd7 was a better defense for black.> Unfortunately, 20.dxe6 fxe6 (20...Bxg2 21.Rd7) 21.Bxb7 Qxb7 22.Rxe6 ... still leaves White a pawn up with an attack.
Mar-19-05
Premium Chessgames Member
  patzer2: Karpov Anatoly (RUS) - Andersson Ulf (SWE) [E11]
Match (active), Enkoping (Sweden) Match (active), Enkoping (Swed (1), 1995 <1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+ 4.Bd2 Bxd2+ 5.Qxd2 00 6.g3 d5 7.Bg2 Nbd7 8.Qc2 b6 9.cxd5 Nxd5 10.00 Bb7 11.e4 N5f6 12.Nc3 c5 13.Rad1 cxd4 14.Nxd4 Qe7 15.Rfe1 Ne5 16.f4 Nc6 17.Nd5!!> [17.Nxc6!? Bxc6 18.e5 Qc5+! (18...Ng4 19.Bxc6 Qc5+ 20.Kg2 Qxc6+ 21.Qe4 Qe8 22.f5 exf5 23.Qxf5 Qc6+ 24.Ne4 Qc8 25.Nd6 Qxf5 26.Nxf5 ) 19.Qf2 Qxf2+ 20.Kxf2 Ng4+ 21.Kg1 Bxg2 22.Kxg2 Rad8 23.h3 Rxd1 24.Nxd1 Nh6 25.Nc3 Nf5 26.g4 Ne7 27.Rd1 ] <17...exd5> [17...Nxd5?! 18.Nxc6 Bxc6 19.exd5 Bb7 20.d6 Qd7 21.Qc7 Qxc7 22.dxc7 Bxg2 23.Kxg2 Rfe8 24.Rd7 Kf8 25.Red1 Rac8 26.Kf3 a5 27.a4 h5 28.h4 f6 29.Ke4 f5+ 30.Ke5 g6 31.Rh7 Kg8 32.Rdd7 Ra8 33.Rdg7+ Kf8 34.Kf6 Rac8 35.Rh8#; 17...Qd7!? 18.Nxc6 exd5 19.exd5 Rae8 20.Rxe8 Qxe8 21.Ne5 Qb5 22.Nc6 Re8 23.a4 Qe2 24.Qxe2 Rxe2 25.Bf3 Rc2 26.b4 ] <18.Nxc6 Bxc6 19.exd5 Qxe1+> [19...Ba4!? 20.Qxa4 Qc5+ 21.Qd4 Qd6 22.Qe5 Qd7 23.d6 Rae8 24.Qc3 Rxe1+ 25.Qxe1 Rd8 26.Qc3 h6 27.Bc6 Qe6 28.d7 Kf8 29.b3 Qe7 30.f5 a6 31.b4 h5 32.a4 Kg8 33.b5 axb5 34.axb5 Kh7 35.Qe1 Qa3 36.Qf2 Ng4 37.Qd4 Qa2 38.Qd2 Qa3 39.Re1 Qc5+ 40.Kg2 Nf6 41.Qe3 Qc2+ 42.Re2 Qc4 43.Rf2 Ng4 44.Qxb6 ] <20.Rxe1 Bxd5 21.Bxd5 Nxd5 22.Qa4 h6 23.h3 a5 24.Qb5 Rad8 25.Re5 Nb4 26.a3 Nd3 27.Re3 Nc5 28.Qxb6 Rd1+ 29.Kf2 Rc1 30.Qxa5 Rc8 31.Kf3 Ne6 32.Rc3 R8xc3+ 33.bxc3 g6 34.Qb4 Rf1+ 35.Ke2 Ra1 36.a4 Ra2+ 37.Kf3 Kg7 38.a5 10>
Mar-19-05  pdl521: The answer for black on 17.Nd5 is Nxd5. This will only create pawn advancing on d file but not a piece less. Black still has better chances this way.

17.Nd5 Nxd5 18.Nxc6 Bxc6 19.exd5 Bb7 20. d6 Qd7 21. Bxb7 Qxb7 22. Qc7 RB8

Mar-19-05  cjhasbrouck: I thought 17. e5 as well.
Mar-19-05
Premium Chessgames Member
  patzer2: Today's puzzle solution 17. Nd5!! is a deflection, which also utilizes the pin and the discovered attack tactics to secure a decisive material advantage (wins at least a decisive passed pawn).

The tempting alternative 17. Nxc6!? is not bad, but quickly fizzles out to a drawish middle game because of a double attack by the Black Queen (e.g. 17.Nxc6!? Bxc6 18.e5 Qc5+! ).

Black, could have put up more resistance (at least against a patzer like me) with 17...Qd7!? or 19...Ba4!?, but against an endgame virtuoso like Karpov these attempts would probably have been futile.

Mar-19-05
Premium Chessgames Member
  patzer2: <pdl521:...17.Nd5!? Nxd5 18.Nxc6 Bxc6 19.exd5 Bb7 20. d6 Qd7.> Now instead of <21. Bxb7!?,> White is winning with 21. Qc7! (Fritz 8 gives it +1.53 @ 15 depth). Detailed analysis is in my first post.
Mar-19-05
Premium Chessgames Member
  Gypsy: <patzer2 ... White is winning with 21. Qc7! (Fritz 8 gives it +1.53 @ 15 depth). Detailed analysis is in my first post. > Pleased to see that Fritz prefers Qc7 to Bxb7 -- Qc7 here is the continuation I'd pick on intuitive basis.

The 17... Nxd5 18.Nxc6 Bxc6 19.exd5 Bb7 20.dxe6 Bxg2 alternative contains a sting I underestimated earlier, namely that 21.Rd7? fails to 21...Qb4! (I considered only 21...Qc5+.) Black is still in dire straights after either 21.Qxg2 fxe6 22.Qh3 or 21.exf7+ Qxf7 22.Qxg2 Qxa2 23.Rd7, but perhaps can still swindle a draw somehow.

Mar-19-05  Eric Xanthus: Yeah I was pretty happy finding that line to the "drawish middlegame" (17.Nxc6 Bxc6 18.e5 Qc5+). Couldn't spot 17.Nd5, though. Quite attractive.
Mar-19-05  csmath: Ulf Andersson was Leko before Leko but against Karpov and Kasparov he was quite toothless.
Mar-19-05  maxundmoritz: What are White's choices and chances after 17.Nd5 exd5 18.Nxc6 Qd6?
Mar-20-05
Premium Chessgames Member
  Gypsy: < maxundmoritz: What are White's choices and chances after 17.Nd5 exd5 18.Nxc6 Qd6?> White clearly has two choices: (i) 19.exd5 Rfe8 20.Rxe8+ Rxe8 21.a3 ... with a passed, advanced central pawn and a bind in the center and on the Q-side; and (ii) 19.e5 Qxc6 20.Qxc6 Bxc6 21.exf6 gxf6 22.Bxd5 Bxd5 23.Rxd5 Rfe8 (23...Rad8 24.Red1) 24.Rxe8 Rxe8 25.Kf2 Rc8 26.Rd2 ... with a vastly superior endgame.

I think a White win in (i) is all but guarateed. White advantage in (ii) may or may not be enough for a win. There probably is some endgame 'theory' for these pawn structures, but I do not know it. It would not surprise me either way me -- if it was a theoretical draw or theoretical win.

Mar-22-05  maxundmoritz: <Gypsy> Thank you for the analysis.
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