Author: Andrew Williams
Date: 03:14:22 03/23/00
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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
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