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Subject: Re: u2600 Position of the Week

Author: Will Singleton

Date: 12:46:14 03/01/99

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On March 01, 1999 at 12:28:07, Bruce Moreland wrote:

>
>On March 01, 1999 at 05:50:44, Peter McKenzie wrote:
>
>>On March 01, 1999 at 04:48:28, Will Singleton wrote:
>>
>>>u2600 Position of the Week
>>>--------------------------
>>>
>>>5R2/8/8/4rp2/3r4/5k2/2B1p2P/2K1R3 w - -
>>>ArasanX Amateur, 0-1, 1999.02.27, fics
>>>
>>>In this position, White played 78. Rg8 and lost.  Could your
>>>program avoid that move within 10 seconds or so?  The game might be
>>>lost in any event (not sure); there is still some play left.
>>
>>Rxf5 Rxf5 Bxf5 Kf2 Rxe2 is a dead draw (even without the pawn on h2) - the white
>>king is in the correct corner to easily draw this ending.  Just play the king to
>>a1, and oscillate the bishop between b1 and a2 :-)
>>
>>It takes LambChop 28sec to lock onto Rxf5 (at depth 8) using a P133 searching
>>about 20K nps.
>>
>>Peter
>
>Yes, R vs B knowledge helps with this.  1. Rxf5 is a draw.
>
>bruce


Well, that's an unexpected result.  I ran this on Hiarcs, and after the
continuation (as above), it still has white down well over a pawn.

So that begs the question, does Lambchop or Ferret actually see that the
position is drawn?  Can a tablebase tell you that?

Will



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