Author: Bruce Moreland
Date: 19:31:51 10/29/98
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On October 29, 1998 at 19:28:46, Helge Gabert wrote: >I upgraded to Rebel10 (at the higher price, by the way --- nobody has contacted >me and offered me a refund) and I'm a little dissapointed with the playing >strength. It seems like Rebel10 is s-l-o-w, and the anti-GM default option is >the likely culprit. An example: BT2630, #27. Where Rebel9 finds the move >e5-e6! after 0:53 on my P90, Rebel10 with anti-GM set to "smart" finds this move >after 5:00, and with anti-GM set to "off" still needs more than 2:00 to find the >winning move. This is just one example, of course, but there seems to be a >trend . . . I'm testing more positions. However, I do like the improved >database functions (the search mask in particular). So, I guess, I can always >use the Rebel9 engine within Rebel10. There are some products where new versions are demonstrably better than old ones, or at least no worse, in every respect. A chess program is not an example of such a product. Chess programs are like cats, they are not particularly predictable, and they odds that they will react like you want them to are by no means high. You can make a very minor change to a chess program and suddenly something that worked well no longer works as well. Of course, if you want to say that the change was good, you have to be able to find something that the new version does better. A different version of a chess program, especially a very different version, will find some shots faster than the old one, and some slower. bruce
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