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Subject: Re: Hashtable size: diminishing returns?

Author: Tom Kerrigan

Date: 09:17:14 03/28/00

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On March 28, 2000 at 11:08:59, Bas Hamstra wrote:

>Question is: is move ordering very important near the root and less important
>near the leafs? Bob Hyatt says so. One mistake near the root costs millions of
>nodes. On the other hand almost all nodes are leafnodes, so bad ordering near
>the leafs costs millions of nodes too.

I think so. At least in my program, hash table size does not matter much. (See
previous posts in this thread.)

>Has anyone measured if you search somewhat deeper if you do extensive ordering
>near the root and cheap (just MVV/LVA) ordering near the leafs and in the
>qsearch?

Because SEE only improves things by ~%10 over MVV/LVA, I don't think doing SEE
at the root and MVV/LVA otherwise would make much sense. You can do searches to
improve move ordering, which is the idea behind internal interative deepening.
So yes, people are doing this, and I believe it works, although I haven't tried
it myself.

-Tom



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