Author: Francis Monkman
Date: 03:48:46 03/23/00
Go up one level in this thread
On March 23, 2000 at 06:14:22, Andrew Williams wrote: >On March 23, 2000 at 05:16:56, Francis Monkman wrote: > >>On March 23, 2000 at 03:09:33, Jason Williamson wrote: >> >>>I have been running Amnon 5.06 under Fritz and have noticed really WEIRD >>>pondering by Amnon. It almost seems that it was just randomly looking at a move >>>and analysing it, even if said move just dropped a queen in one move, or a piece >>>or what ever. Mind you, it plays ok on its own time, and still maintains a >>>position of one of the top 5 or 6 amatuer chess engines I have. >>> >>>Jason >> >>If I'm not mistaken, this problem is related to the difficulty of extracting a >>pv line from an MTD(f) search. >> >>Francis > >This is interesting (to me anyway). My program uses mtd(f) and it extracts >its PV from the hash table. I found that if the hash table is of a reasonable >size, the PV for the first several plies is usually OK. > It was just the other day (after some experiments with MTD(f), storing pv in hash table etc) that I noticed that AnMon's pv line in Winboard was clearly printing garbage. I note your use of the words 'reasonable' and 'usually' with interest! BTW on this topic, I wrote to Prof Hyatt recently pointing out that I'd found identicalities in the 17 lsbs (all I'm using for hash address-generation in a Chess variant, Shatra) of the piece hashkeys' random numbers output by the 'Knuth' algorithm he implements in Crafty. Also that Knuth now (1990s revision) proposes a fix for said algorithm.
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.