Author: Christophe Theron
Date: 17:04:48 02/06/04
Go up one level in this thread
On February 06, 2004 at 19:33:22, Bob Durrett wrote:
>On February 06, 2004 at 19:18:54, Christophe Theron wrote:
>
>>On February 06, 2004 at 13:48:48, Jaime Benito de Valle Ruiz wrote:
>>
>>>This endgame study can be game following the sequence
>>>
>>>1.Bd1 g1Q 2.Bxa4 Qc1 3.Bxd7 h5 4.Be8 h4 5.Ba4 Line
>>>
>>>[d] 8/3p4/p6p/k2N3B/p7/K6p/PP4pP/8 w - - 0 1
>>>
>>>Many engines (Fritz 8, Hiarcs 8, Ruffian 1.01) cannot win this endgame, probably
>>>due to the well known null-move problem for extreme and rare positions such as
>>>this.
>>>
>>>They just don't find 5. Ba4
>>>
>>>Try your engine after 4...,h4
>>>
>>>[d]8/3p4/p6p/k2N3B/p7/K6p/PP4pP/8 w - - 0 1
>>>
>>>All the above mentioned engines play 5.Bd7 and get a draw instead of winning.
>>>
>>>Regards,
>>>
>>> Jaime
>>
>>
>>
>>Chess Tiger X: 1.15 second on PIII-M 933MHz (Dell X200), 6Mb HT:
>>
>>N14 0.33s Bd1 g1=Q Bxa4 Qc1 Bxd7 h5 Be8 h4 Bd7 Qxb2+ Kxb2 0.00
>>N15 0.66s Bd1 g1=Q Bxa4 Qc1 Bxd7 h5 Be8 h4 Bd7 Qxb2+ Kxb2 +0.90
>>N15 1.15s Bd1 g1=Q Bxa4 Qc1 Bxd7 h5 Be8 h4 Ba4 Qxb2+ Kxb2 Kxa4 Kc... +3.26
>>
>>
>>
>> Christophe
>
>The key question to be answered is:
>
>"What is there about Chess Tiger X that is different from the other engines
>mentioned which accounts for the fact that they could not find the move but
>TigerX could? Is the "null-move problem" not applicable to TigerX or is there
>some other reason?
>
>Bob D.
I have worked a lot on zugzwang detection in Tiger 15, and it has been improved
further in the new version (CT X). I think that's the answer. It's simply an
area I've been working on.
Christophe
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