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Subject: Re: Qsearch survey

Author: Dann Corbit

Date: 16:02:51 12/31/01

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On December 30, 2001 at 10:57:30, Severi Salminen wrote:

>I just would like to see how other engines do in similar position. So, feed the
>position (1.e4 e5 2.d4 d5) to your engine, perform a 10 ply search and report
>the number of nodes and qnodes. To make sure we count nodes identically, this is
>what I do: I increase nodes if I don't call qsearch() from search() and I
>increase qnodes in the beginning of qsearch(). Like this:
>
>search()
>{
> if(depth<=0)
>   qsearch()
> nodes++;
>.
>.
>}
>
>qsearch()
>{
> qnodes++;
>.
>.
>}
>
>Try to get similar counting scheme so figures are comparable. Here is the
>position:
>[d] rnbqkbnr/ppp2ppp/8/3pp3/3PP3/8/PPP2PPP/RNBQKBNR w KQkq - 0 1
>
>And please tell if you use SEE or not. I'll post my results soon also.

Beowulf:

[1]W >
Current Position = 0.00
Number of Possible Moves = 38

  6     82      54      49373   d4e5 d5e4 d1d8 e8d8 b1c3 f8b4 c1d2 b4c3 d2c3
  7     81     118     110039   d4e5 d5e4 d1d8 e8d8 b1c3 b8c6 c1g5 f8e7 O-O-O c8
d7 c3e4 e7g5 e4g5 c6e5
  8     82     307     330523   d4e5 d5e4 d1d8 e8d8 b1c3 f8b4 c1d2 b4c3 d2c3
  9     98     879    1022553   d4e5 d5e4 d1d8 e8d8 b1c3 c8f5 c1e3 f7f6 e5e6 f5e
6 c3e4
 10     92    2100    2731528   d4e5 d5e4 d1d8 e8d8 b1c3 b8d7 c3e4 d7e5 c1g5 f8e
7 O-O-O c8d7 g5e3

Search Time : 32.09 Seconds
Total Nodes Searched   : 4545978  (81.3% Qui)
Total Nodes Evaluated  : 3696803
Cuts       : Delta   431054  : SEE      192114  : Mate          0
           : Razor   328658  : Eval    2392193
Extensions : Check   137160  : OneRep     1121  : CMThreat    716
           : Pawn      2272  : Recap     22151  : RevCheck   1743
Hash Stores (Size) : 891007  (2796181)
Hash Probes (Hits) : 3027461  (871862)
EGTB Probes (Hits) : 0  (0)
Move Ordering      : 92.5%
Best Move = d4e5



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