Author: Mike S.
Date: 17:24:54 01/15/00
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On January 15, 2000 at 17:53:40, Sanjiv Karnataki wrote: >I don't think the problem is with null moves. I think the problem is egtb. with >EGTB crafty after 2:00 minutes comes up with 1. c7 nc8 with adv. for white >. turn off egtb and it immediately comes up with 1. c7, kxc7 2.axb6 etc. >(...) I have tested Crafty 17.04 under ChessBase with 4 piece EGTB's, and it shows from the start on 1.c7 Nc8 (16.6 likes 1...Nd7 better). I didn't test without TB's. The forced mate in 18 is possible only *after* 1...Kxc7, which is therefore a mistake from black's view. So black plays different. Without the TB's, Crafty has not yet seen the mate, and obviously thinks that the knight moves are even worse than Kxc7 etc. The TB's provide an improvement here. Btw., I think there are situations where TB's might be problem because of the speed reduction, especially if the "solution" is a variation that runs along positions which are not in the database (i.e., because trading moves are wrong and the material is kept in the correct continuation). This problem does not occur it seems, when the TB data is held in memory in a compressed form. I've read Nimzo 7.32 has this, even resulting in a speed gain. I remember posting this in rgcc, but got no response. Maybe too sophisticated. I also don't have Nimzo 7.32 and again do not really know what I'm talking about... Regards, M.Scheidl
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