Author: Uri Blass
Date: 13:19:51 01/31/02
Go up one level in this thread
On January 31, 2002 at 14:36:04, Dann Corbit wrote: >On January 31, 2002 at 14:31:38, David Rasmussen wrote: > >>On January 31, 2002 at 13:13:57, Dann Corbit wrote: >> >>>On January 31, 2002 at 06:58:28, David Rasmussen wrote: >>>[snip] >>>>>Just like "ply" means 20 different things to 20 different programmers. Even >>>>>"nodes" does not always mean the same thing. >>>>> >>>> >>>>Agree with you on nodes, but ply? Ply is pretty well defined, I think. >>> >>>For sure it is not. In fact, even when we agree, we disagree. Every single >>>chess program will have a tree of a different shape. So even when we count >>>plies the same way, the actual search can be incredibly different (with the >>>number of nodes visited differing by several orders of magnitude). Compare, for >>>instance, Mchess with Goliath. >>> >>>Junior [for instance] does not count plies the same way as other programs. >>> >>>Ply is ill defined. In fact, I think it is actually impossible to define it >>>accuracy, except in the brute force sense. And absolutely nobody exhausts a ply >>>when doing chess games with an engine. >>>[snip] >> >>That is bull. A ply is a half move and that is that. What you are talking about >>is: what does it mean when we say a program searches 8 ply? Of course if that is >>the question, the answers are as many as there are programs. But in this thread >>we are talking about a full width alpha-beta tree (at least, since DB had >>singular extensions, which requires extra searches), of some fixed depth search >>in a given program (that is, move ordering and evaluation forms the tree). > >I suggest that you lookup with the CCC search engine the dozens of posts that >shot *ME* down when I tried to insist that a ply is a ply is a ply. > >The thorough and convincing arguements against it showed that I was clearly >wrong. > >As you are clearly, unmistakeably, and totally wrong right now. He is not wrong if we talk about full width alpha beta. Uri
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