Author: Sune Fischer
Date: 04:09:47 09/11/02
Go up one level in this thread
On September 11, 2002 at 06:26:01, Uri Blass wrote: >On September 11, 2002 at 04:46:56, Sune Fischer wrote: > >>On September 11, 2002 at 00:01:16, scott farrell wrote: >> >>>On September 10, 2002 at 02:56:01, Sune Fischer wrote: >>> >>>>On September 09, 2002 at 20:01:29, scott farrell wrote: >>>> >>>> >>>>>I have tried a variation on that, being : INFINITY+(100-ply) - so it stays over >>>>>infinity, so if it finds mate it returns nice a quickly. I guess your way >>>>>continues to look for a shorter mate. >>>>> >>>>>But I still get the same sympton, the first move in the mate sequence returns >>>>>INFINITY+99 (ie. INFINITY+100-1). >>>>> >>>>>I guess is something to do with wierd hashing, or my replacement scheme or >>>>>something. i hope its not another bug in the hashtable. >>>> >>>>You never ever want to go higher than INFINITY, the signs are important here. >>>> >>>>Use INFINITY-ply (why add 100?) >>>>So that INFINITY-1 is mate in 1 ply >>>>INFINITY-2 mate in 2 plies (1 move) and in general INFINITY-x mate in x plies. >>>> >>>>This works well for the a-b algorithm, your opponent will choose the move with >>>>the highest score as always, so he will pick the move INFINITY-4 rather than >>>>INFINITY-7, always the shortes way to the mate (you never mate if you take the >>>>longest (instability)). >>> >>>I dont see the big advantage of picking a shorter mate - mate is mate - I win - >>>thanks for coming - (or more often, oops I lose) - maybe I can loose slower >>>though. >> >>Well, programs are a little different in this respect. >>If you reverse the scores it will consistently pick the longest way to the mate. >>That way you are _sure_ never to checkmate. > >No > >You will finally have no choice because there is not going to be longer mate >because of the 50 move rule or repetition. > I know, but I decided not to bring it up as it would only confuse the issue and it most likely isn't related to his bug. -S.
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