Author: Michael Henderson
Date: 17:21:57 09/19/04
Go up one level in this thread
On September 19, 2004 at 19:26:25, Stuart Cracraft wrote: >On September 19, 2004 at 19:11:51, Michael Henderson wrote: > >>On September 19, 2004 at 18:55:25, Stuart Cracraft wrote: >> >>>On September 19, 2004 at 17:51:05, Michael Henderson wrote: >>> >>>>On September 19, 2004 at 17:04:14, Stuart Cracraft wrote: >> >>>>> 2) is the above normal that walking the hash gives sometimes >>>>> a longer pv? >>>> >>>>perfectly normal since many people use hash to "extend" their PV's >>>> >>> >>>Not sure I understand. >> >>The length of the PV using hash tables is variable because you don't know the >>length of the PV...you just keep probing the hash until you can't get anything >>useful out of it. >> >>for example: >>triangular array PV: A B C D E >>walking the hash PV: A B C D E F G >> >>you got move F because you probed position E and found a good move to print. >>Move G from probing position F. Triangular array PV has a definite depth--search >>depth limited. >> >> >>> >>>> >>>>> >>>>> 3) I update my triangular array in the main search and the >>>>> quiescence search. reasonable? >>>> >>>>yes. The problem with qsearch is that it's just "cleanup"--considers only >>>>certain types of moves. So qsearch section of the PV might contain some stupid >>>>moves you might not want to display. There's nothing wrong with knowing what >>>>your qsearch is doing, though... >>> >>>More information is never less, to be sure. >>> >>>> >>>>> >>>>> 4) Anything else you can think of. Ok these are some random but relevant questions: 1. When you make a two-square pawn move, and the opponent cannot make an ep capture, do you hash-xor the "target" ep square in the hash table? 2. When you get a null move cutoff at a node and store in the hash table, do you store NULLMOVE as the move in the hash table, or do you store the move from the hash probe at this node?
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