Author: martin fierz
Date: 07:52:19 10/16/03
Go up one level in this thread
On October 16, 2003 at 10:27:41, José Carlos wrote: >On October 16, 2003 at 10:05:23, Uri Blass wrote: > >>On October 16, 2003 at 09:56:59, Tord Romstad wrote: >> >>>On October 16, 2003 at 08:35:54, Uri Blass wrote: >>> >>>>Nalimov tablebases are not very important for endgames and they are not going to >>>>change results in most of the endgames. >>> >>>This depends to a great extent on the engine, I think. The experiments I have >>>seen which conclude that tablebases have no measurable effect on playing >>>strength >>>have always been conducted with strong engines like Yace and Crafty, which >>>probably play excellent endgames even without tablebases. I expect that a >>>program >>>with little or badly tuned endgame knowledge will profit much more from >>>tablebases. >>> >>>Tord >> >>Most of the mistakes in endgames are in positions when tablebaes cannot help. >> >>Maybe they can help if the program does not know to win KQ vs K but better >>evaluation can solve this problem and more problems so I do not think that >>tablebases is the right thing to add. >> >>Uri >> >>Uri > > KRPKR is hard without tablebases, same for KQKR, KBBK, KBBKN, KRKN and some >others. The importance of tablebases is not only to play those endgames >perfectly, but to choose the correct variation many moves before when you see >those positions in the search and your eval is not enough. > On the other hand, in Anubis I have chosen not to implement tablebases but >good eval. IMO, a good eval is better because it's more general so you can >evaluate endgames with many pawns, it's faster and you don't depend upon >external files (this is important when you release your engine as freeware and >other people don't have tablebases). > Averno plays endgames badly without tablebases, probably worth 50 ELO or more >(haven't checked it). > > José C. in my last 50 tournament games i didn't have a single one of these endgames you mention. i can't imgaine that tablebases make a 50 elo difference. KBBK is practically trivial, even without tablebases! cheers martin
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