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Subject: Re: "Percentage of fail-highs" question

Author: Gian-Carlo Pascutto

Date: 17:31:19 01/04/00

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On January 04, 2000 at 15:53:29, Daniel Clausen wrote:

>I can't test against other engines, since the Crafty version I use doesn't show
>the
>number of q-nodes and Hiarcs also doesn't. :(

I believe Der Bringer does, and i'll test the position with that one
someday.

>Note that the numbers above were for the initial position though. And my
>q-search only includes captures. (no checks, or other extensions in qsearch)

After 1. h3 I get over 46%. And I don't do check extensions nor anything
else either. Hmmm...

>For the position (7 plies)
> 2rr2k1/1b3ppp/pb2p3/1p2P3/1P2BPnq/P1N3P1/1B2Q2P/R4R1K/ b - -

This is from LCTII, right ?

>I get:
>#nodes=2'809'852
>#q=545'239 [19%]

I get 48.60%.

>(Of course without finding the winning move Rxc3)
>Hm.. it's more likely that I count q-nodes also different than other people
>though. :))

\begin{proud_mode}

MINE DOES ! AND CRAFTY DOESNT ON THE SAME SYSTEM !

\end{proud_mode}

Whew...that felt good ;)

>int search(int ply, int maxPly, ...)
[...]

Looks ok to me...

[...]
>but I'd rather fail-high after the 5th than not at all.

You are right. I forgot about the fact that whether your current node
fails high is dependent on the move ordering of the nodes higher up in
the tree...oops.

--
GCP



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