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

Author: Jouni Uski

Date: 22:19:08 06/11/01

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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



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