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Alexander McDonnell vs Louis Charles Mahe De La Bourdonnais
London m4 ;HCL 18 1834  ·  Sicilian Defense: Old Sicilian. Open (B32)  ·  1/2-1/2
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Kibitzer's Corner
Sep-30-04  Knight13: Why can't white Queen by taking 57. fxe5 ? Or is it draw by mistake?
Oct-01-04  PizzatheHut: <Knight13> If 57. fxe5, then 57...Kxe5 58. Kg4 Kf6 and because of the opposite colored bishops, White will never be able to break Black's blockade on the dark squares, so therefore it is a draw.
Dec-07-07
Premium Chessgames Member
  nimh: Rybka 2.4 mp, AMD X2 2.01GHz, 10 min per move, threshold 0.33.

McDonnell 6 mistakes:
12.Qd2 -0.48 (12.Na4 -0.14)
16.Qb3 -0.27 (16.c3 0.31)
30.Nxf7 1.73 (30.Nc4 3.21)
34.Qxd6+ 0.95 (34.Qe1 1.49)
52.Kg4 0.00 (52.Ba4 0.91)
54.Kg4 0.00 (54.g4 0.83)

De La Bourdonnais 5 mistakes:
12...g5 0.22 (12...a4 -0.48)
23...Rg7 0.42 (23...Ra8 -0.10)
24...Qg6 0.97 (24...Bb6 0.39)
25...Bc5 2.03 (25...Bb8 0.90)
39...Rb2 0.93 (39...Kc7 0.43)

Dec-07-07  beatgiant: <nimh>
<54.Kg4 0.00 (54.g4 0.83)> Very interesting.

Does Rybka really see any winning chances for White here after 54. g4? Still looks close to a dead draw to me. Can you post a few moves of it's winning try so I can learn what I'm missing?

Also, if its eval is 0.00 after White's 52nd move but rises to 0.83 on 54. g4, it means Rybka thinks Black has dropped 0.83 worth of eval between those moves. What did Rybka recommend for Black's 52nd and 53rd moves?

Dec-07-07
Premium Chessgames Member
  nimh: You're right, the position after 54.g4 is a draw.

<What did Rybka recommend for Black's 52nd and 53rd moves?>

52...Bd4 (eval rises quickly after this black move)
53...Bf2

Feb-24-08  wolfmaster: 5.Nxc6 is a small error because it strenfthens Black's center. But people playing 174 years ago did not know that!
Dec-27-10  Llawdogg: Wow! One of the earliest bishops of opposite colors end games. La Bourdonnais looked very comfortable pulling out the draw while down two pawns. He was better in the openings and better in the end games. All of McDonnell's chances were in the middle game tactics.

I also read that McDonnell was very nervous and totally stressed out all the time. He died young one year after this match. The match took a lot out of both of them.

Feb-04-12  Knight13: 32...Bxc4!! is the best move. La Bourdonnais understood the drawish nature of the Bishops of Opposite Color endgames even in 1834 and went for it (and finally hits the nail on the head on move 39)! 30. c4 was the right time to play it; Black would be positionally lost then.
Feb-04-12  Knight13: Correction: Black would be *completely* positionally lost then.
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