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Alberic O'Kelly de Galway vs Jan Hein Donner
Amsterdam (1950), Amsterdam NED, rd 8, Nov-21
Horwitz Defense: General (A40)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Apr-19-10  notyetagm: http://www.chesscafe.com/motifs/mot...
Apr-19-10  notyetagm: http://www.chesscafe.com/motifs/mot...

27.f4?

Missing an immediate win of a piece via 27.b5! cxb5 28.c6.

Apr-19-10  notyetagm: O'Kelly vs J H Donner, 1950

http://www.chesscafe.com/motifs/mot...

27.f4?

Missing an immediate win of a piece via 27.b5! cxb5 28.c6.

Apr-19-10  notyetagm:

Game Collection: Blockaders do not defend squares

Game Collection: ACTS: Alignments Create Threatened Squares

May-29-10  notyetagm: <PAWN FORKS>, <RELOADERS>, <ALIGNMENTS>, <BLOCKADERS>, <ACTS>: You do *not* want your pieces to be anywhere near your opponent's pawns.

b6-♖ + d6-♘
34 ♖c2-c5! Shulman vs Kamsky US Championship 2010

b7-♖ + d7-♘
27 b4-b5! O'Kelly vs Donner Amsterdam 1950

Oct-22-11  notyetagm: Game Collection: ACTS: ALIGNMENTS CREATE THREATENED SQUARES!
Feb-27-15  notyetagm: O'Kelly vs J H Donner, 1950

27 ... ♘f6-d7?


click for larger view

Here White played 27 f3-f4?, missing an instant win with

(VARIATION)
28 b4-b5! <overloaded: blockading c6 & protecting b5>


click for larger view

28 ... c6xb5 29 c5-c6 <pawn fork>


click for larger view

27 ... ♘f6-d7? is a blunder because it created a <PAWN FORK ALIGNMENT> in front of the advanced White c5-pawn, <OVERLOADING> the <BLOCKADING> Black c6-pawn.

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