Author: Mark Rawlings
Date: 09:34:55 01/29/06
Go up one level in this thread
On January 29, 2006 at 10:45:28, Robert Hyatt wrote: >On January 29, 2006 at 09:52:57, Kurt Utzinger wrote: > >>On January 29, 2006 at 09:38:56, Majd Al-Ansari wrote: >> >>>I have a completely different result. I see quite a big difference and many >>>"won" games are now won instead of drawn. >> >> Please be good enough to present those results >> here. This would be of great interest. >> Kurt >> >>I have checked out quite a few games >>>and I will say that EGTB's greately improve endgame play for Rybka, and plug a >>>lot of holes. >> >> This is contrary to long experience with other engines >> where you can almost see no difference regarding overall >> score after playing some hundred games. >> Kurt >> >> EGTB are especially important if the other side has them. Not >>>having them will leak a lot of points. Still there is quite a ways to go for >>>Rybka when endgames are concerned. It still plays some endings horribly. But >>>the gaps are getting smaller and smaller and I am very interested to see how >>>Rybka will be with beta 14 (EG knowledge added). > > >One note: > >Playing EGTB vs NoEGTB to see if EGTB helps is probably the wrong way to measure >the experiment. It is more useful to take a known good program _with_ EGTBs, >and play your favorite engine against it, with your engine not using 'em, then >playing again with 'em. If the opponent doesn't have 'em, then your not having >them might not expose the problem as well as making sure your opponent can >always win those tricky cases and you now have to rely only on your eval to hang >on... One thing that makes a comparison difficult when you play a program with and without tablebases is that there's probably a lot of basic endgame knowledge that is not programmed into the engine because the author knew he was going to use tablebases. For example, a program may not have the knowledge to win kbn vs k without tablebases, but the author could have added the extra code if he wanted to. I assume that some endgame knowledge was removed from crafty years ago when tablebases became common. Tablebases vs no tablebases would be a good thesis topic for someone! Mark
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.