Author: Pallav Nawani
Date: 04:36:22 02/23/05
Go up one level in this thread
On February 23, 2005 at 04:45:32, Uri Blass wrote: >On February 23, 2005 at 04:18:03, Dann Corbit wrote: > >>On February 23, 2005 at 03:07:35, Uri Blass wrote: >> >>>On February 23, 2005 at 00:51:25, Matthew Hull wrote: >>> >>>>I've noticed that GNUChess ponders from the very first move of the game, even >>>>though it is still in book. Is this a usual practice? >>>> >>>>Does this give some advantage to the search when the game drops out of book, >>>>since the hash table may have some relevant entries? >>> >>>I do not do it in Movei. >>> >>>Movei is too weak to even consider to implement such stuff that maybe gives 1 >>>rating point. >>> >>>I think that it is significant work to check for no bugs in such code and in the >>>same time of working on the code I can get more rating points from implementing >>>different stuff. >> >>The point of first exit from the book is very important. Many programs give a >>double time increment on book exit. This is a very clever strategy by GnuChess >>and I think it may be more valuable than you imagine. >> >>Of course, you can only do it in ponder mode. > >I do not think that the first move out of book is more important to use >time in it than other moves(I see no logical reason to use in move 11 twice the >time that you use in move 12 and not using in move 12 twice the time that you >use in move 13 and the fact that the program is out of book first in move 11 and >not in move 12 may be dependent in the choice of the book). > >In part of the cases the program does not predict correctly the opponent move >when it is out of book so my estimate is that it is not going to give you more >than 1 elo. > >Uri It can be useful if your engine comes out of a book in a position it does not understand. When Natwarlal comes out of book showing a negative score, it uses upto 3 times of the normal time allocation to try to find a better move. This can sometimes save games. Pallav
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