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Subject: Re: Test position (perpetual check)

Author: John Merlino

Date: 13:42:56 06/30/05

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On June 30, 2005 at 15:57:25, Zappa wrote:

>On June 30, 2005 at 15:21:48, Dennis Breuker wrote:
>
>>This is a nice test position (analysis from one of my own games).
>>
>>[D] 1k1r4/5p1p/BpQ1np2/3pp3/1P1q4/P7/3K4/R7 w - -
>>
>>White is threatening mate in one.
>>Black can't do anything about it.
>>
>>What do your programs do?
>>Do they play the losing Kc2, letting Black exchange Queens?
>>
>>Or do they play the drawing move Ke1!, sacrificing the rook with check.
>>After Ke1, the resulting position is a draw, since Black has to give
>>a perpetual check (otherwise White mates).
>>
>>Dennis
>
>How does white draw after 1. Ke1 Qxa1+ 2. Kd2 Qd4+ 3. Ke1 Qe4+ 4. Kd1 Rd7 5.
>Qxd7 d4 ?
>
>anthony

Exactly. If Black can make check on the a8-h1 diagonal, then play d4 -- problem
solved.

jm



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