Author: Scott Gasch
Date: 12:09:24 02/12/01
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On February 12, 2001 at 14:52:43, Alex Patterson wrote: >sertman1(C) kibitzes: 19. Qxd5 Rb8 20. Nxb5 Nf6 21. Qc6 Qd7 22. Qxd7 Nxd7 23. c4 ><HT> > >That is my handle on ICC using crafty-18.1. What does <HT> mean? > Most chess programs keep a hash table (or transposition table) containing score information about positions already encountered in the search. Crafty, like most programs, stores upper bound, lower bound and exact scores in the hash. When searching, its possible that the program will find it has already considered the current position and has a score for it in the hash table. That is, the same position has come up in the past and been searched deeply enough so as to satisfy the remaining depth left to search when it comes up again. The <HT> at the end of crafty's PV probably means the exact score of the position at that point in the search was found in the hash table and used. Therefore the "rest" of the PV moves are not available. For instance if it was a 12 ply search and the PV printed only has 10 moves in it and ends in <HT> the final two (or move) moves were not displayed because they were not available. All that was available was the score of the position at the end of the displayed PV. My program does the same thing for <TT> hits as well as <DRAW>s, <EGTB>, <RECOGN>, and <MATE>. This is just to help me better understand what's going on when I see a PV.
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