Author: Stephen Ham
Date: 08:14:50 02/27/03
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On February 27, 2003 at 00:38:31, K. Burcham wrote: > > >"I also found that its ability to evaluate positions was not equally good. In >fact, I think Fritz 6a and Fritz 7 have more accurate evaluation functions". > >Hello Stephen, > could you post some examples where you think Shredder has eval not as >accurate as Fritz. > >best to you, >kburcham Hi K! Actually, I did exactly that in my review. There I sited several examples. http://www.chesscafe.com/REVIEWS/books.HTM In fact, I ran many more tests, using my own Coorespondence Chess games as test subjects, so that I could be reasonably certain that I understood what the "real" evaluation was. But, since my review ran quite long anyway (some thought the final draft was already too long), I only sited some examples and then summarized that my other tests confirmed the conclusions from these examples. I think Robin Smith illustrated the situation clearly (thanks Robin!) when he wrote that Shredder 7's evaluation was too "optimistic." If an advantage exists, Shredder 7 often magnifies that advantage out of proportion to reality. Also, to some degree, Shredder 7 changes its assessment with each iteration and move more than Fritz 7, which I used for a comparison benchmark. For many people who merely want the engine to find strong moves, then Shredder 7 is an excellent choice in open positions. However, I was disappointed in it's play in closed positions with locked pawn chains (see my review). But I use a chess engine merely to test my own opening novelties. Often I think I've found "improvements" and so want a strong and objective partner to confirm/reject my ideas. And if my position is indeed better, how much better is it? Do I have an edge or a clear advantage? That's why I'd like my partner to have a trustworthy evaluation function to compare to my own assessments. Hopefully I've clarified this better for you, K. Thanks for your interest. All the very best, Stephen
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