Author: Robert Hyatt
Date: 13:06:56 08/27/99
Go up one level in this thread
On August 27, 1999 at 15:24:50, blass uri wrote: >On August 27, 1999 at 11:09:59, Robert Hyatt wrote: > >>On August 27, 1999 at 01:54:24, blass uri wrote: >> >>> >>>On August 27, 1999 at 00:06:25, Robert Hyatt wrote: >>> >>>>On August 26, 1999 at 20:21:04, Mark Rawlings wrote: >>>> >>>>>I _finally_ got all of the 5-piece tablebases to use with Crafty and Winboard! >>>>>These things are great for analyzing endgames. Still waiting for the 6-piece >>>>>files to be posted :) >>>>> >>>>>Anyway, what is a "successful" tablebase probe? I thought when you have the >>>>>whole set, all probes were successful? Thanks, >>>>> >>>>>Mark >>>> >>>> >>>>Note that you don't have the "whole set" because we didn't build the 4 vs 1 >>>>piece files. You can, but they take up a whole lot more space, and I don't >>>>think crafty needs those to win the positions.. :) >>> >>>There are some 3 vs 2 tablebases that crafty does not need to win the position. >>> >>>For example KQRvs KP,KQR vs KN >>> >>>Uri >> >> >>There are many that it doesn't need... (KQ vs KR is another) however without all >>of them, the search definitely gets confused. And it is much better to _know_ >>when you are exchanging into a won ending, rather than into an ending you think >>you can win but can't... >> >>We will have to do the 4 vs 1 files before we get to the 3 vs 3 files, which >>are not too far into the future now. So one day we will have all the 5's and >>a bunch of the 6's... > >I do not think that you will have to do all the 4 vs 1 files. >I think that using simple rules to decide if the position is drawn or not drawn >is faster than getting to tablebases in most of the cases. > >For example I think that KQRP vs K is always winning for the side with the >advantage if the position is not stalemate. > >KQRP vs K tablebases can help you to know the exact distance to mate but are not >important for other practical purposes. > >Uri Right.. but notice I was talking about _building_ the 6 piece files... and there we need _all_ 5 piece files to compute distance-to-mate properly...
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