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Subject: Re: Nice end-game problem; here is another phenomenon, who can explain?

Author: Jeremiah Penery

Date: 10:25:15 04/27/99

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On April 27, 1999 at 08:22:21, Harald Faber wrote:

>On April 27, 1999 at 08:00:18, Bernhard Bauer wrote:
>
>>>Again, now the correct position where Crafty and Fritz only see Be5 as best move
>>>while Be7 easily wins:
>>>
>>>qnb5/1p1k1K2/pPp2B2/P1p5/2P5/8/8/8 b - -
>>
>>May be I'm sitting on the wire. -:)
>>The above FEN position looks as follows:
>>
>>
>>       +---+---+---+---+---+---+---+---+
>>    8  | *Q| *N| *B|   |   |   |   |   |
>>       +---+---+---+---+---+---+---+---+
>>    7  |   | *P|   | *K| B | K |   |   |
>>       +---+---+---+---+---+---+---+---+
>>    6  | *P| P | *P|   |   |   |   |   |
>>       +---+---+---+---+---+---+---+---+
>>    5  | P |   | *P|   |   |   |   |   |
>>       +---+---+---+---+---+---+---+---+
>>    4  |   |   | P |   |   |   |   |   |
>>       +---+---+---+---+---+---+---+---+
>>    3  |   |   |   |   |   |   |   |   |
>>       +---+---+---+---+---+---+---+---+
>>    2  |   |   |   |   |   |   |   |   |
>>       +---+---+---+---+---+---+---+---+
>>    1  |   |   |   |   |   |   |   |   |
>>       +---+---+---+---+---+---+---+---+
>>         a   b   c   d   e   f   g   h
>>
>>How can a black bishop move to e5 or e7 in this position?
>>I see only one black bishob on c8. This bishop can not move anywhere.
>>Can you enlighten me please?
>>
>>Kind regards
>>Bernhard
>
>Argh! Amazing what can go wrong...put the WHITE BISHOP back to f6 and then WHITE
>TO MOVE. Now Be7 wins while Crafty and Fritz, well, you know what...

Here is my output (WITH nullmove - I have not changed anything about nullmove in
the code)
8->   0.17   7.14   1. Be7 Qa7 2. bxa7 Kc7 3. a8=Q Nd7
                    4. Kg7 Ne5
9     0.18     --   1. Be7
9     0.22     ++   1. Be7!!
9     0.57  Mat06   1. Be7 Qa7 2. bxa7 Kc7 3. Bd6+ Kxd6
                    4. axb8=Q+ Kd7 5. Qe5 b5 6. Qe7#
9->   0.58  Mat06   1. Be7 Qa7 2. bxa7 Kc7 3. Bd6+ Kxd6
                    4. axb8=Q+ Kd7 5. Qe5 b5 6. Qe7#

Jeremiah



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