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Sarah N Longson vs Ana Paula De Oliveira
Khanty-Mansiysk Olympiad (Women) (2010), Khanty-Mansiysk RUS, rd 8, Sep-29
Sicilian Defense: Dragon Variation. Yugoslav Attack Early deviations (B75)  ·  1/2-1/2

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Jan-28-12
Premium Chessgames Member
  profK: A wild game ! Opening is worth a memory.
Mar-05-14
Premium Chessgames Member
  FSR: In the below position, de Oliveira's 54...Kxb4?? was a blunder, throwing away the win.


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In such positions, the player with the bishop and wrong-colored rook pawn must leave <both> of the opponent's pawns on the board, stalemate the opponent (except for one pawn move), compelling the opponent to advance his/her knight pawn, allowing the rook pawn to capture it, thereby transmuting itself into a knight pawn and winning. It is essential to leave <both> of the inferior side's pawns on the board so that once the side with the bishop plays RPxNP the inferior side still can advance the other pawn, so there is no stalemate. Black could have won with 54...Kc2! 55.Ka2 Kc1 56.Ka1 (56.Ka3 Kb1 57.Ka4 Bd3 58.Ka3 (58.Ka5 Bb5 59.Kb6 Kb2 60.Kc5 Kxb3) 58...Ka1 59.Ka4 Kb2 60. Ka5 Kxb3) 56...Bb1! 57.b5 axb5 58. b4 Be4.

Euwe vs J Baay, 1921 was similar except that the inferior side had an a and b pawn rather than two b pawns:


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Black resigned in light of 64...Ka6 65.Bb6! b4 66.axb4 a3 67.b5# or 64...Kb8 65.Kb6 b4 66.axb4.

Mar-05-14
Premium Chessgames Member
  FSR: Friday or Saturday puzzle after 54.Ka1. See my prior comment - White was unable to solve this one.

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