Author: Andrew Williams
Date: 03:21:51 03/24/00
Go up one level in this thread
On March 23, 2000 at 14:26:06, Jason Williamson wrote: >On March 23, 2000 at 08:24:39, Andrew Williams wrote: > >>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 > > >Im a little unclear as to what you mean "fail to produce a move a root". If >mean failing to generate a line to ponder, no I never noticed that. As to the >hash I was using 32M. > >Jason Sorry, I miswrote. You interpreted it correctly, however. Thanks. Andrew
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