Author: Ryan B.
Date: 01:06:14 02/07/06
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On February 07, 2006 at 03:21:09, Tord Romstad wrote: >On February 06, 2006 at 21:47:09, Ryan B. wrote: > >>Rather it is to hide extra hidden search or for marketing propaganda > >Marketing propaganda? What does the nodes/second ratio have to do >with marketing? > Many people seem to think that low nps means more chess knowledge in the eval. You and I may know this is not always the case but many non programmers that buy chess engines don't. Note that Vas once posted that he thinks Shredder manipulates its node count. >>I do not know but I do know Rybka manipulates its node count. > >"Manipulates" is a too negatively loaded word. It implies something >dishonest, when it is perfectly possible (and IMHO much more likely) >doesn't do quite the same kind of work at each node as most other >programs. > >The exact definition of a "node" differs between different programs, >and even if Rybka uses the most common definition (one node for >each call to search() or qsearch()) the behavior you observe (high >tactical strength compared to the N/s, very irregular N/s depending >on the position) isn't really that strange. It could be, for instance, >that Rybka is moving the pieces around a lot on the internal board at >each node in order to decide just how static the node is, and use this >to make search decisions. Such internal, "horizontal" searches at >each node could easily reduce the N/s count a lot, while preserving >tactical strength. It also makes a lot of sense that the N/s is much >lower in tactically messy positions. > >This is just one of many possible explanations, of course. In any >case, I think "manipulate" is an unfortunate word to use. > >Tord Sorry if the word "manipulates" sounded negative. I feel Vas does hide things in what Rybka does but I do not mean for it to sound negative, it is his right to do so. If you know of a similar word that does not imply anything negative please let me know and I will use the better word in the future. I don't wish to offend anyone with my posts. Ryan
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