Author: J. Wesley Cleveland
Date: 11:35:36 02/01/04
Go up one level in this thread
On February 01, 2004 at 12:41:53, Robert Hyatt wrote: >On February 01, 2004 at 07:20:20, Dieter Buerssner wrote: > >>On January 31, 2004 at 22:08:33, Robert Hyatt wrote: >> >>>On January 31, 2004 at 21:37:29, J. Wesley Cleveland wrote: >> >>>>>What do you do with KRPP vs KR positions deep in the tree where you need to >>>>>promote? >>>> >>>>I take the exact value from the KRPP vs KR table and prune. You only need >>>>the KR** vs KR tables if you promote with a capture. >>> >>>How can you do that? How do you know the promoted position is a win or a draw >>>(or even a loss) even though the previous un-promoted position was a win or >>>draw? >> >>You don't need to know it inside the search tree. As Wesley said, you have >>already cut the tree, before you are going to promote. >> >>Regards, >>Dieter > >I don't follow. I reach a krppkr position at the root, and I make the best >move, until there is no winning move except a promotion which I can't see. So >now I do a search, and I _still_ need the tables to make sure I don't promote >wrongly into a draw... > >If you have krpp vs kr, you still reach positions where you will have to search >or else shuffle and draw. And there you need the right tables or you can end up >with =Q and a draw where =N may win... *At the root*, you need all the tables, *but* speed is much less an issue since your "search" is only one ply. Below the root, the search cuts off whenever you have a tablebase hit, so you only need the promoted tables when capturing at or after promotion.
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