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Subject: Re: K+P ending in practical play

Author: Bruce Moreland

Date: 01:34:14 10/27/98

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On October 26, 1998 at 13:30:07, Ernst A. Heinz wrote:

>"DarkThought" with sophisticated Pawn-race scoring as mentioned above and
>running on a 600MHz Alpha-21164a fails low on 62. Qxd4 in iteration #11
>after roughly 2 sec. Thereafter, it wavers between 62. Qc2 and 62. Qf3+ which
>it both scores as slightly positive for White.

I want to confirm that square of the pawn does seem to fix this one.  I'll still
play Qxd4, but it's not +1 anymore.

>>8/6pp/4pk2/8/2PpP3/6P1/4KP2/8 w - - 0 63
>>
>>White to move.  Here is the positions with the queens off, if this helps >anyone.
>> I think white is lost already here.
>
>If your FEN is correct, "DarkThought" disagrees. It suggests to play 53. e5+
>and scores the position as roughly equal.
>
>PV = 63. e5+ Kxe5 64. Kd3 Kd6 65. Kxd4 e5+ 66. Ke4 Kc5 67. Kxe5 Kxc4 ...

Yes.

>>8/6p1/5k2/2P4p/3pPP2/8/4K3/8 w - - 0 66
>>
>>White to move is completely lost.  Mine figures this out after a while, but it
>>takes too long, in my opinion (over a minute on a P6/200 to really start to
>>crater).  I'd be interested in knowing if anyone knows they are dead quickly.
>
>Yes, now White is completely lost. "DarkThought" scores the position as -1.4
>after a couple of seconds and fails below -6 after half a minute.

Yes, I get a nice big drop real fast now too.

>Thanks for posting this interesting position.

Lots of them on the servers, please get your program playing there.

bruce



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