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Subject: Hashtable and stuffing the PV in it

Author: Kim Roper Jensen

Date: 05:25:32 06/17/03


Hi

After reading the posts regarding hashtables, where Robert Hyatt and others show
that the most significant improvements is in the 24M-96M area I was thinking
about the whole hashtable thingie...

Reading some papers(of course i forgot which, i will try to locate again) it
seems that stuffing more of the PV in the hashtable will improve the efficiency
another notch(article states 3% in middlegame and 12% in the endgame)

As i recall they stuffed 2.5 ply PV in the hashtable.

So what i am really asking is this :

1. Have anyone ever tried to put longer lines of PV in the hashtable ?

2. Could there also be a "better" number for how many ply's that should be
inserted ?

I was just thinking instead of using a big hashtable, maybe it would be better
making a bigger entry with PV in it instead. Mainly because the efficiency dont
really skyrocket when we get over the 24M-96M size.

Of course im on work doing some really boring administrative tasks, so i may
just be daydreaming.....

Any thoughts or comments ??

Regards
Kim



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