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Subject: Re: In Reference to: A Problem With Tablebases

Author: blass uri

Date: 08:35:23 04/04/00

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On April 04, 2000 at 11:10:34, KarinsDad wrote:

>On April 04, 2000 at 10:10:51, William H Rogers wrote:
>
>>On April 04, 2000 at 00:00:41, KarinsDad wrote:
>>
>>>It occurs to me that the example that Jeremiah gave us in that thread could
>>>still result in a loss for the KNP side of KNNPKNP. For example (and I did not
>>>check this with tablebases, I am making an illustration here and hopefully, I
>>>set it up correctly):
>>>
>>>[D]8/n1PK3p/k6N/8/6N1/8/8/8 w - -
>>>
>>>Now, even though this may result in a mate for white after c8(Q)+, it may take
>>>more than 50 moves to do it. However, the idea is that the knight at h6 could
>>>blockade the pawn until about move 40 or so, then it could come attack the king,
>>>then when the pawn is pushed, it could go back and blockade again for a moment.
>>>The 50 move counter would be reset since the pawn was pushed and then the knight
>>>could come back to attack the king again.
>>>
>>>Now, this probably does not work for this particular example. I just put it here
>>
>>I am not that strong of a chess player, but I think I would move Nf6 then on the
>>next turn capture his pawn.
>>Bill
>>
>
>Nf6 followed by Nxh7 is a poor combination. It forces a draw when white may have
>a win by blockading the pawn instead. KNNK is a draw. KNNKP may be a win for the
>two knight side (and in this position, it probably is IF the 50 move rule can be
>avoided). Yes, I realize that this may not make sense on the surface (I was
>mistaken about it as well in an earlier thread yesterday), but check yesterday's
>thread titled "A problem with tablebases" for an explanation.
>
>KarinsDad :)

I think that Nf6 and Nxh7 does not lead to KNN vs K so it may be a win for
white.

I think I would play Nf6 and Nxh7 and after it not promote the pawn but try to
trade knights.

I did not look at the position more than a few seconds and maybe I missed
something but I do not see how black can trade the knight for the pawn and get
KNN vs K.

Uri



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