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Features

July 18, 2013

Eureka! A line of attack is discovered

— Archimedes, the great Greek scientist, was stepping into a bath when he suddenly realized, as the water rose, that the volume of water displaced must be equal to the volume of the part of his body he submerged. He was so excited by this discovery that he ran outside naked, shouting “Eureka!”  

This week’s position also has a Eureka moment, or, as it is called in chess, a “discovered attack.” With this hint in mind, please try to find black’s winning move.

White’s queen is unguarded, as she sits along the same rank as black’s queen. Between the two queens is black’s dark-squared bishop. White’s king rests on h2, a dark square. This is all black needs to give white a bath.

Black shouts “Eureka!” as black’s dark-squared bishop on d2 checks white from f4.  Regardless of how white responds, black’s queen soon snatches white’s exposed queen. For example, if white blocks the bishop check with its knight on h1, which ostensibly protects the queen, the bishop pins the knight and white’s queen is lost.  

You don’t have to be naked to find a discovered attack. But your opponent will feel as if he is.

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