Computer Chess Club Archives




Subject: Re: right now, at this very moment wac 141?

Author: Uri Blass

Date: 15:34:40 09/29/04

Go up one level in this thread

On September 29, 2004 at 18:20:45, martin fierz wrote:

>On September 29, 2004 at 16:21:43, Uri Blass wrote:
>>I think that it is clear that extending every nate threat by a full ply will
>>blow your search.
>>If you do not use partial extensions then I suggest that you do not extend mate
>>threats unless  you have some conditions to extend them only near the root and
>>not every where.
>i extend mate threat by a full ply always. and my search isn't blowing up, at
>least not that i notice. then again, WAC 141 shows some strange behavior with my
>latest version:
>MUSE 0.89.10 UCI 30 MB:
> 1   00:00 -1.65   Kg2g1
> 2+  00:00 -2.36   Kg2f1
> 2   00:00 -2.36   Kg2f1 Nf4d3
> 3   00:00 -1.22   Kg2f1 Re8b8 Kf1e1
> 4   00:00 -2.13   Kg2f1 Kg8h7 Bb3d1 Nf4d3
> 5   00:00 -2.16   Kg2f1 Re8e2 Kf1g1 Nf4d5 Kg1f1
> 6+  00:00 -1.66   Qc1xf4
> 6   01:24  M6  Qc1xf4 Bd6xf4 Rh4xh5 g6xh5 Rh1xh5 Bf4h6 Rh5xh6
>it sees Qxf4 after 0 seconds (this is on a slowly 1.4GHz P4), but needs a very
>long time to resolve it. but at least it sees Qxf4 in 0 seconds :-)
>  martin

If you extend also checks by  a full ply then there are cases when there is a
long sequence
check ,escape threat mate,check,escape threat mate and it means that you may
have big problems to search deep in position when one side threats mate but the
opponenthas a lot of checks because he tries to do perpetual checks.

You can easily search some lines to more than 100 plies at small depth and  I do
not believe that it is a good idea.



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