Author: Thomas Mayer
Date: 19:28:15 12/07/05
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Hi, > The following is from the read me included with the engine : [..] > 3) Tablebase support (I should say that it is only my personal opinion that > tablebases are not a playing strength feature - others may disagree) > 4) Proper handling and reporting of mates > Question 1. Is, with the implementation of 3) and 4) will this fix the > endgame problems discussed here or will it require more work by Vasik and > therefore will not be fixed in the official release later this month. well 3) will fix some obvious problems like not being able to win KPK or KBNK and such trivial stuff. And it might prevent to get in a draw KPK endgame if a win is still possible. As several experiments did show the influence of TBs on the overall strength of an engine is very limited and maybe less then 10 Elo. (And I mean +10 Elo, but also -10 Elo ! Both is thinkable no experiment was large enough to give us a secure value about this) In the special case with Rybka I definitely think that it will be on the + side because it seems that it does not know much about trivial endgames and therefor will profit from them. 4) will solve severall other mating problems where Rybka reports always +320.00 for mates. See: when all moves lead to a mate, but some in x moves and some in x+y moves and they are ALL evaluated with the same value, the engine chooses the move randomly. And when it stumbles then finally in a mate it was more or less by accident or it does not find any other mate with another move > Question 2. Once the endgame problems are fixed, will this improve the > strength of the engine. It will improve the results for sure. We have seen in this forum several draws of Rybka which should have been won. I am sure that with 3) and 4) Rybka will win most of those presented games. I don't know how many % they represent in total, but it is sure that you will see some rating increasement and no lower rating in ratinglists. By how much ? Well, it depends on the percentage of games where the current problems are seen. Most play with automatic resign or adjudication by the GUI -> So Rybka's mating problem isn't seen THAT often. If they would all play until mate maybe the percentage of this missed wins would be higher, no idea... > Perhaps we will know more nearer time of release. That's for sure... :) At least 3 days after that... Greets, Thomas
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