Author: Andrew Williams
Date: 05:24:39 03/23/00
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On March 23, 2000 at 07:49:50, Jason Williamson wrote: >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. >> >>Some figures: I've got a log files from the last few days' play on ICC. >>PostModernist pondered 4515 times in these games and its pondering move >>was right 52% of the time. Obviously this doesn't say anything about the >>quality of the moves it was pondering when it was wrong, but in watching it >>I have only very rarely noticed my program pondering a move that is obviously >>not going to occur. >> >>Is there any way, Jason, to say how often AnMon's pondering move is correct? >>Even an approximation would be interesting. >> >> >>Andrew > > >Lets say 1 in 10 would be generous. Compared to other engines, Anmon was >pondering quite bizzare. I mean, with PM, how often will PM ponder a move that >puts a piece enprise? OK. That is odd. What size hash table has it got? Does it ever fail to produce a move at the root? As for PM, I think this happens *very* rarely. I've seen that maybe four or five times since PM has been online, but of course I don't watch every game, nor do I inspect every log file it generates. Andrew
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