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Subject: Re: what are the most important Six man tablebases?

Author: Tony Werten

Date: 14:17:55 09/06/02

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On September 06, 2002 at 16:58:50, Dieter Buerssner wrote:

>On September 06, 2002 at 16:32:25, Tony Werten wrote:
>
>>On September 06, 2002 at 16:27:22, Dieter Buerssner wrote:
>>
>>>On September 06, 2002 at 16:14:19, Robert Hyatt wrote:
>>>
>>>>>What is the estimated size [of kppkpp]?
>>>
>>>>at least 1000 gigabytes (a terabyte)
>>>
>>>How do you estimate this?
>>>
>>>My simple estimation (ignoring the ep problem, but it should not make a bigger
>>>factor) would be:
>>>
>>>3612 * 48 *47 / 2 * 46 * 45 / 2
>>>
>>>which would make 4 Gb positions, compressed obviously less. Even 64^6 (taking no
>>>symmetry into account) is "only" 64 gigabytes.
>>
>>Bob gave an estimate of all the files (ie conversions) wich I wanted to know.
>>You changed my question.
>
>Sorry then. I really misunderstood your question. To my excuse, I want to say,
>if I relook at the context, it could be easily understood as a question of the
>size of kppkpp only:

No problem. Point is that kppkpp itself will not help you so much. It might say
you are winning, but chances are very small you'll checkmate with the 2 pawns so
you need the conversions as well.

>
>>>>>And which ones is a must have?
>>>>KPPkpp :) but that will take some more time.
>>>And one hell of a lot of disk space.
>>What is the estimated size ?
>
>You and Bob meant the estimated size of kppkpp and all conversions. I obviously
>understood it (influenced by your first answer, that is shown as >>>) as the
>size of the most useful 6-men TB.

Yes, I see what you mean. Bob knows I'm able to calculate the size of 1 table,
but not every reader knows I can.

BTW with these 6 man tables you probably need a 16 bit counter for distance to
mate, making them twice as big. (You could do with less extra bits but that
would kill your compression I think)

Tony

>
>Regards,
>Dieter



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