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Subject: Re: another anti-computer endgame position

Author: Vasik Rajlich

Date: 08:13:49 08/29/04

Go up one level in this thread


On August 29, 2004 at 09:52:25, Uri Blass wrote:

>On August 29, 2004 at 09:37:13, Uri Blass wrote:
>
>>On August 29, 2004 at 08:58:46, Vasik Rajlich wrote:
>>
>>>White to play and avoid Rg5. According to my calculations, you'd need a 120-ply
>>>search to understand that Rg5 draws.
>>>
>>>Vas
>>>
>>>[D] 8/6k1/4p1r1/4Pp1R/5P2/5K2/7P/8 w - - 0 1
>>
>>You do not need to see that Rg5 draws in order to avoid Rg5
>>It is enough to find a move that is evaluated as better.
>>
>>
>>Stupid Movei does not know much about endgame and does not use hash for pruning
>>but it avoid Rg5 from the first second.
>>
>>I guess that after I add some knowledge it may have a problem to avoid Rg5
>>
>>depth=18 +1.75 h2h4 g7f7 h5g5 g6h6 h4h5 h6h8 f3g3 h8h6 g3h4 h6h8 g5g2 h8h7 g2g3
>>f7e7 g3g6 e7d7 h4g5
>>Nodes: 286711354 NPS: 769922
>>Time: 00:06:12.39
>>depth=18 +1.75 h2h4 g7f7 h5g5 g6h6 h4h5 h6h8 f3g3 h8h6 g3h4 h6h8 g5g2 h8h7 g2g3
>>f7e7 g3g6 e7d7 h4g5
>>Nodes: 315137376 NPS: 780448
>>Time: 00:06:43.79
>>depth=19 +1.77 h2h4 g6h6 h5g5 g7f7 h4h5 h6h8 f3g3 h8d8 h5h6 d8h8 g5g7 f7f8 g7g6
>>f8f7 g6f6 f7e7 g3f2 h8h7 f2e3 e7d7 f6g6 d7e7
>>Nodes: 393358321 NPS: 781884
>>Time: 00:08:23.09
>>
>>Uri
>
>There was a reduction at depth 20 so I was interested to see if movei may find
>Rg5 but it was only a temporary reduction
>
>depth=21 +1.93 h2h4 g6h6 h5g5 g7f7 h4h5 h6h8 f3g3 h8d8 h5h6 d8h8 g5g7 f7f8 g7g6
>f8f7 g6f6 f7e7 g3f3 h8g8 h6h7 g8a8 f6h6 a8h8 h6h2 e7f7
>Nodes: 1287416720 NPS: 795708
>Time: 00:26:57.95
>
>Uri

True - really the problem should be for the position after Rg5:

Black to play and report a drawing score.

Vas

[D] 8/6k1/4p1r1/4PpR1/5P2/5K2/7P/8 b - - 0 1



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