Author: Steffen Jakob
Date: 08:06:46 02/19/99
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Hi Werner! On February 19, 1999 at 10:41:28, Inmann Werner wrote: >On February 19, 1999 at 08:47:20, Steffen Jakob wrote: > >>Hi Werner! >> >>On February 18, 1999 at 18:01:43, Inmann Werner wrote: >> >>>Hello! >>> >>>After looking at the results of the other programs and mine, I got really >>>disturbed. After ply 8, my program calculated 2.454.000 positions, and the >>>others do around 700.000! >>>I checked my extensions and put out my check extension, and suddenly my program >>>only needed around 600.000 nodes. >>>I think, i do something very very wrong! >>>I extend on any check that comes when there is only 2 or less distance till >>>quiet search. This seems to blow up the tree extensively. I do this extension >>>up to 5 times within one search, so sometimes in a 8 ply search , I search to >>>ply 13. >>>So my question is. >>>When should I extend on check? >> >>You have to make sure that you don't use extensions which are > 1 ply. Otherwise >>your tree will explode. Another thing which is useful is to reduce the >>extensions when you are searching very deep (e.g. if(ply > 2*root_depth) >>extension >>= 1). >> >>Greetings, >>Steffen. > >Thanks Steffen! > >I again found some big bug. The bugs don´t end.... >I wanted to extend on beating sequences on the same field, which do not change >material too much, but as bug is, I extended on all beatings possible!!! >You can imagine the tree explode? >Sometimes I am confused, why Inmichess with all this bugs play chess, and not so And sometimes it even happens that your program plays worse when you remove the bug :-) >bad chess. In the last 2 weeks this is th 3rd big bug, I found. So i am looking >forward to test my new version! I hope Hossa will eat the bugs.. :-) Hossa's rating dropped to 2200 again but I don't know why. I didn't change much (almost the same version was able to win a 5 0 game against Bob's orginal Crafty some days ago) and won't have time to change much in the near future. I wish you good luck with Imnichess. Best wishes, Steffen
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