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Carl Jaenisch vs Alexander Petrov
Unknown (1852)
King's Gambit: Accepted. Bishop's Gambit Lopez Variation (C33)  ·  1/2-1/2



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Kibitzer's Corner
Premium Chessgames Member
  Honza Cervenka: Are the final position and result correct? 67.Kc6 a6 68.Kb6 Kd7 69.Kb7 etc. is easy to find even for a beginner not mention Jaenisch who was very strong player.
Sep-17-02  pawntificator: You mean black didn't resign?
Premium Chessgames Member
  Honza Cervenka: I don't know. Maybe black tried to play on stalemate (67.a6??).
Premium Chessgames Member
  Sneaky: If Black had played 64...Kd8 I think the game would be a draw.

E.g. 65. Kd6 Kc8 66. c7 a6 =
or 65. Kd6 Kc8 66. a6 Kd8 67. Kd5 Kc8 =

Premium Chessgames Member
  Honza Cervenka: You are right, Sneaky. White did not play the ending well. Why did he move with his a-pawn? If black a-pawn stays then only c-pawn has to go ahead, for example 51.c4 Kd7 52.c5 Kc7 53.c6 a5 54.a4 Kc8 55.Kc5 Kc7 56.Kb5 etc. or 53...a6 55.Kc5 a5 56.a4 etc.
Nov-09-04  who: perhaps time was an issue?
Nov-09-04  Swindler: I dunno, but I don't think they used clocks in those days.
Aug-27-18  DVRazor: Back then players knew little of endgame theory.
Premium Chessgames Member
  Plaskett: 53 a4?? threw away the win.
To win such an ending, as Dvoretsky taught, the superior side´s Rook´s Pawn must remain unmoved. If unmoved then zugzwang´s easily result when the Bishop´s Pawn reaches the seventh.
Premium Chessgames Member
  perfidious: Dang, how did Jaenisch even reach that won ending? His position was putrid after twenty moves.
Premium Chessgames Member
  whiteshark: The Pawn endgame should be lost right from the beginning:

click for larger view

White to move

1) +132.6 (31 ply) <39.h5> Kg7 40.Kf5 Kh6 41.Ke5 Kg5 42.Kxd5 Kh6 43.Kc6 Kg7 44.h6+ Kh7 45.Kd5 Kg8 46.h7+ Kh8 47.Kc6 c4 48.Kd5 a5 49.Kxc4 a4 50.Kb5 Kg7 51.Kxb6 Kf6 52.Kc5 Kg5 53.h8=Q Kg4 54.Qg7+ Kf5 55.Qf6+ Kg4

2) +65.09 (30 ply) 39.Kf4 b5 40.h5 b4 41.cxb4 c4 42.b5 d4 43.Ke4 d3 44.cxd3 c3 45.Ke3 Kg5 46.d4 Kf5 47.Kd3 Kf4 48.Kxc3 Kf3 49.h6 Ke2 50.Kc2 Ke1 51.h7 Kf1 52.Kd2 a5 53.bxa6 Kg2 54.Kc2 Kh2 55.h8=Q+ Kg2

3) +3.91 (30 ply) 39.a4 Kg6 40.h5+ Kf6 41.Kf4 a5 42.Kg4 b5 43.axb5 a4 44.b6 a3 45.b7 a2 46.b8=Q a1=Q 47.Qd6+ Kg7 48.Qe5+ Kh7 49.Qxd5 Kh6 50.Qg5+ Kh7 51.Qe7+ Kh8 52.Qe5+ Kh7 53.Qe4+ Kh8 54.Kf5 Qf1+ 55.Qf4 Qd1 56.Qe5+ Kh7 57.Qe7+ Kh6 58.Qg5+ Kh7 59.Qg6+ Kh8 60.Ke6 Qa1 61.Qh6+ Kg8

6.0 minute analysis by Stockfish 9 v010218

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