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Subject: Re: Why is this type of endgame position still so difficult??

Author: Robert Hyatt

Date: 05:56:56 06/12/01

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On June 12, 2001 at 01:19:08, Jouni Uski wrote:

>On June 11, 2001 at 10:56:57, Robert Hyatt wrote:
>
>>On June 11, 2001 at 01:31:14, Jouni Uski wrote:
>>
>>>[D]8/4k3/2K5/6p1/6B1/7P/8/8 w - -
>>>
>>>I tested this simple draw position with 3 engines:
>>>Fritz5      +4,53 no TBs
>>>Goliath     +3,39 no TBs
>>>Crafty18.7  +5,01 with 4 piece TBs
>>>
>>>Hmm. Should this already be solved poblem?
>>>
>>>Jouni
>>
>>
>>It _is_ a solved problem. I don't know where that 5.01 is coming
>>from.  Here is output from crafty:
>>
>>                3     0.02   0.00   1. Kd5 Kf6 2. Bc8
>>                3->   0.02   0.00   1. Kd5 Kf6 2. Bc8
>>                4     0.03   0.00   1. Kd5 Kf6 2. Bc8 Kg6
>>                4->   0.04   0.00   1. Kd5 Kf6 2. Bc8 Kg6
>>                5     0.04   0.00   1. Kd5 Kf6 2. Bc8 Kg7 3. Bd7
>>                5->   0.05   0.00   1. Kd5 Kf6 2. Bc8 Kg7 3. Bd7
>>                6     0.06   0.00   1. Kd5 Kf6 2. Bc8 Kg7 3. Bd7 Kf6
>>                6->   0.09   0.00   1. Kd5 Kf6 2. Bc8 Kg7 3. Bd7 Kf6
>>                7     0.10   0.00   1. Kd5 Kf6 2. Bc8 Kg7 3. Bd7 Kf6 4.
>>                                    Be8
>>                7->   0.20   0.00   1. Kd5 Kf6 2. Bc8 Kg7 3. Bd7 Kf6 4.
>>                                    Be8
>>                8     0.22   0.00   1. Kd5 Kf6 2. Bc8 Kg7 3. Bd7 Kh7 4.
>>                                    Be8 Kh6
>>                8->   0.34   0.00   1. Kd5 Kf6 2. Bc8 Kg7 3. Bd7 Kh7 4.
>>                                    Be8 Kh6
>>                9     0.44   0.00   1. Kd5 Kf6 2. Bc8 Kg7 3. Bd7 Kf6 4.
>>                                    Be8 Kg7 5. Ke5
>>                9->   1.02   0.00   1. Kd5 Kf6 2. Bc8 Kg7 3. Bd7 Kf6 4.
>>                                    Be8 Kg7 5. Ke5
>>               10     1.17   0.00   1. Kd5 Kf6 2. Bc8 Kg7 3. Bd7 Kf6 4.
>>                                    Be8 Kg7 5. Ke5 Kh7
>>               10->   1.64   0.00   1. Kd5 Kf6 2. Bc8 Kg7 3. Bd7 Kf6 4.
>>                                    Be8 Kg7 5. Ke5 Kh7
>>               11     2.46   0.00   1. Kd5 Kf6 2. Bc8 Kg7 3. Bd7 Kf6 4.
>>                                    Be8 Kg7 5. Ke5 Kh8 6. Kf5
>>
>>
>>Don't know what that score is coming from...  Perhaps the version
>>you have has a bug of some sort.  18.10 at least doesn't have this problem,
>>and I haven't changed anything recently in this area that I know of...
>
>Have You tested WITHOUT 5 piece Nalimov? I want to solve this without 10GB
>tablebases...
>
>Jouni
>
>Jouni


Did you notice that the above does not end with <EGTB>?  I didn't use them.
(BTW, they are about 7.5 gigs, not 10gigs.  :)  )




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