first move

  
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Last problem posted :


Svante Carl von Erichsen    (2008-07-11 15:26:09)
first move

I think that the first move has to be 1.Qaxf7 or 1.Qfxf7.
Reason: In order to complete the task in 4 moves, we have to keep the king in check, otherwise Black can stall with checks of his own; so, one of the Queens d7, e7, or f7 has to be captured. Capturing e7 results in immediate counter-check, and capturing d7 has no continuation. Also, f7 is the only candidate under double threat.
However, I find no forcing continuation afterwards when the black King just moves to d8.




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