Author: José Carlos
Date: 05:43:39 11/12/01
Go up one level in this thread
On November 12, 2001 at 08:14:32, Gian-Carlo Pascutto wrote: >On November 12, 2001 at 06:59:51, Bas Hamstra wrote: > >>On November 12, 2001 at 04:46:19, Gian-Carlo Pascutto wrote: >> >>>On November 11, 2001 at 19:42:29, Bas Hamstra wrote: >>> >>>>Is there any documentation about linking Nalimov? >>> >>>probe.txt, which comes with the generator >>> >>>>I am not sure what score a probe() should return. I set up a FINE that is a mate >>>>in 23 (verified on nalimov's online TB site). However, when my probing function >>>>returns 32756. Some debugging in TBIndex.cpp learns that initially it found 113 >>>>that is then converted to 32756 by macro S_to_L. Doesn't seem right. Shouldn't >>>>it just return the number of moves to mate eventually? Peeking in Crafty seems >>>>to indicate so. >>> >>>I figured out the conversion formula by setting up some positions >>>and looking at the values I got back until I figured it out. >>> >>>In Sjeng, it looks like this: >>> >>>if (tbScore == bev_broken) return KINGCAP; >>> >>> EGTBHits++; >>> >>> if (tbScore > 0) >>> { >>> return ((tbScore-bev_mi1)*2+INF-ply-1); >>> } >>> else if (tbScore < 0) >>> { >>> return ((tbScore+bev_mi1)*2-INF+ply); >>> } >>> return 0; >> >>Hi GianCarlo, >> >>I saw this in Crafty too. But that doesn't give me a realistic value at all. >>However if I use L_bev_mi1 (like in ExChess) in stead it comes more in the right >>direction. But that gives me a M13 in stead of the M23. >> >>(I checked in TBIndex.cpp the right squares are found) >> > >M23 = ((M13-1)*2)-1 > >If you compare this to the formula above you will see it is similar. > >I'm sorry I cannot be of more help, but I think the best thing >to do is not to try to figure out how other formulas work (depends >too much on how you represent mate scores in your program), but >to set up a few positions where you know what the score should be, >and look at what the probing function gives you back. > >By comparing the two, it should not be hard to arrive at the correct >formula for your program. At least, thats how I did it :) > >-- >GCP You can find the conversion values in probe.txt, in Hyatt's site. I don't have it here (I'm at work), but I can post it later at night, if you wish. José C.
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