Computer Chess Club Archives




Subject: search extension

Author: Inmann Werner

Date: 03:20:18 07/08/98

To make ma program faster I included Null-Move and a cutoff one ply
before the horizon, if the position is "good".
On the other hand, simple mates go beyond the horizon (also because of
small quiet search).

My idea:

If I do a Null-Move it Cuts if greater Beta. OK
if it is much lower than alpha I extend the search, because it could get
to some interesting mate.

The idea behind: In Null move the other side can do 2 moves in row. If this
gets to a very high score (mate) it is interesting enough to extend.
I made some tests, and the program really found the mates 1 to 2 plys faster.
Also, the program does not get much slower.

Is this a "good idea". Why not use Null-Move the other way round?



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