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Subject: Re: perft records

Author: Reinhard Scharnagl

Date: 09:17:48 09/06/04

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On September 06, 2004 at 12:03:44, Uri Blass wrote:

>On September 06, 2004 at 11:45:29, Reinhard Scharnagl wrote:
>
>>Uri,
>>
>>I have made a little additional test (without mate detecting):
>>
>>FEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
>>
>>  +-*--b--c--d--*--f--g--*-+ MS Visual Studio C++ Version 13.10
>>8 |[r][n][b][q][k][b][n][r]|
>>7 |[p][p][p][p][p][p][p][p]| Perft Testseries
>>6 |   :::   :::   :::   :::|
>>5 |:::   :::   :::   :::   | (without caching)
>>4 |   :::   :::   :::   :::|
>>3 |:::   :::   :::   :::   | Test #:      00
>>2 |<P><P><P><P><P><P><P><P>|
>>1 |<R><N><B><Q><K><B><N><R>| Break Time 75.0 Sec.
>>=>+-*--b--c--d--*--f--g--*-+
>>
>>Ply     Nodes    all (x)   (e.p.)    all (+)      (#)    Promot.    Castl. Sec.
>>-------------------------------------------------------------------------------
>>1          20          0        0          0        0          0         0    0
>>2         400          0        0          0        0          0         0    0
>>3        8902         34        0         12        0          0         0    0
>>4      197281       1576        0        469        0          0         0    0
>>5     4865609      82719      258      27351        0          0         0    0
>>6   119060324    2812008     5248     809099        0          0         0    6
>>7  3195901860  108329926   319617   33103848        0          0    883453  150
>>-------------------------------------------------------------------------------
>>
>>It seems to be about 10% faster without checking for mates.
>>
>>Those 10% seem to be the prize if one wants to have also that information.
>>
>>Regards, Reinhard.

>Thanks for this information
>What is the prize for detecting checks?
>
>I have a legal move generator but I detect checks today only during make move
>and not during move generation.
>
>Uri

Hi Uri,

The detecting of checks is so essentially integrated within my move generation,
that it hardly could be switched off without rewriting the whole approach. Thus
I cannot provide you with that requested value, sorry.

But have a look at following statistics in calculating secure fields the king
would be able to move on: [http://www.chessbox.de/Down/CRC_Test_01.txt]

Reinhard.



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