Author: Jeremiah Penery
Date: 06:53:51 10/15/99
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On October 15, 1999 at 03:44:30, Ed Schröder wrote: >>Posted by Marcus Kaestner on October 14, 1999 at 04:01:40: >> >>in chessbits 3 i´ve made a test with the nunn-endgames (10 endgame-positions >>played with both sides). every program one time with, one time without tb´s >> >>after abaout 140 games >>h7.32 earned +5 elo for the tb-version >>n7.32 earned +12 elo >> >>far the best was crafty 16.13 with +65 elo, topping even the score of hiarcs >>7.32tb >> >>marcus > >Take this into account: Some programs may have so much chess knowledge in their >programs that (the current) TB's have zero effect in the end. This will change >as soon as the 6-man TB's (and up) will come, no doubt.. Definitely. >Other programs are developed to 100% rely on TB's and therefore have very few >(or nothing) chess knowledge inside because there is no need for that. I don't >know in to what extend this is true for Crafty but I am confident Bob will >tell you. I don't think there are any programs developed to "100% rely on TB's" so that they wouldn't have any knowledge about the endgame. Whatever search/eval they have will still be quite good (At least in endings where TBs would affect things - 5 piece or less), it's just that the TBs provide 100% accuracy. >As a result you can not compare the value (elo gain) of TB's in this way as >it will depend of what is already inside a program (or not). > >Rebel knows the most important ones such as (by head): > >- KRK Yes, this one is easy. >- KNNK Of course, this is always a draw. >- KBNK This one's interesting, but not really that difficult. >- KPK This is pretty easy, too. >- KRPKR >- KNPKN >- KBPKB >- KQPKQ <lumping these last 4 together> I'm a bit skeptical about some of these. I'm sure it may play even 90% accurately in these endings, but I'd be willing to bet it couldn't win 100% of winnable positions from these endings (especially KRPKR and KQPKQ) against an opponent with the TBs. >I am sure this list is not complete. Of course the bad-bishop situation is >covered too. Some others are not covered such as KQKR (Hi Jim!) for which >Rebel will rely on TB's in the future. I'm sure Rebel could easily win KQKR without TBs, even against an opponent with them. It's an easy ending for computers. Jeremiah
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