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Subject: Re: takes shredder5 51 seconds to find mate in one

Author: Rory Nolan

Date: 23:49:28 09/27/01

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On September 27, 2001 at 18:13:57, Roy Eassa wrote:

>On September 27, 2001 at 18:03:43, Uri Blass wrote:
>
>>On September 27, 2001 at 17:45:03, Roy Eassa wrote:
>>
>>>I thought all programs searched everthing one ply first, then two ply, then
>>>three, etc.  If there's a MATE at one ply, then it would find it in a tiny
>>>fraction of a second, no matter which order it chose to look at the moves, no?
>>>Or is it doing extensions on other moves, even at ply 1?
>>
>>yes
>>it does a lot of extensions in this kind of positions.
>>it extend all the logical captures.
>>usually the number of captures is not big so it can finish the job very fast but
>>it is not the case in the relevant position.
>>
>
>Would it be reasonable, then, for modern programs to avoid doing extensions on
>the first several ply?  Or for the first 1% of the allotted time?  Or something
>like this?

Junior 7 results
Junior 7 - Nolan,R
8/8/pppppppK/NBBR1NRp/nbbrqnrP/PPPPPPPk/8/Q7 w - - 0 1

Analysis by Junior 7:

1.axb4 Qxf3 2.Rxg4 Rxd5 3.gxf4
  +-  (4.27)   Depth: 3   00:00:00  3kN
1.Qh1#
  +-  (#1)   Depth: 3   00:00:00  16kN
  +-  (#1)   Depth: 3   00:00:00  16kN

( 28.09.2001)

take care
Rory





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