Author: Robert Hyatt
Date: 21:50:04 08/08/02
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On August 08, 2002 at 14:43:32, Alvaro Jose Povoa Cardoso wrote: >If I wanted to play with EGTBs with only win/loss/draw information and no >DTM/DTC information where would I place the probe code in the search routine? >Taking crafty as an example it has the TB probe code placed next to the hash >table probe code and if the current position is in a TB file it returns >immediately because is has perfect/complete information. But with 2bit/entry >EGTBs it just doesn't seem right to place the code there. It seems logic to me >to place the TB probe code in the evaluation function and if a leaf node is in a >2bit/entry TB file give it a bonus. Another possibility would be to place the TB >probe code before calling the qsearch. >Could someone tell me if I'm thinking correctly? > No. You should probe _exactly_ where I do. The only difference will be the "score". You won't be able to return a mate in N, so you will have to doctor the score to some value that says "mate in N where N is large and unknown." If you probe in the eval, you will probe a million times too often. You should probe when you drop into a 5 piece (or smaller) ending, which only happens infrequently and immediately after a capture only... If you do it at endpoints, you will get killed tactically because your search depth will drop off _several_ plies... >Best regards, >Alvaro Cardoso
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