Author: Pavel Blokhine
Date: 00:06:21 05/29/03
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On May 29, 2003 at 02:55:04, Rupesh wrote: >Shredder 7.04 shows a curious behaviour. While playing on playchess, i have >observed that shredder's eval has a tendencey to change signs dramatically ( >like -2.4 from +1.3, many examples like this abound). While it is true that the >program does not show this kind of behaviour if the same position recurs again >and it does try a different move (perhaps using its learn file). > >So the program plays really badly initially and becomes better gradually after >playing a reasonably large number of games. I have a plr ( the learn file of >shredder 7.04) of 4.9 MB which is considered to be very big. Still shredder has >not stopped the habit of changine the sign of its eval. > >What i really suspect is that shredder's evaluation function is not robust and >often misses completely to evaluate a chess position at crucial time.I bneleive >this happens with shredder significantly more often than other programs. But >over repeated games against a fixed number of opponents ( it learns to expect >the kind of positions that might arise and becomes better)..but if it faces a >new opponent ( may be the same program on a different hardware and setting), it >again has to learn before it starts beating the opponent program.) > >It has been a curious fact that shredder starts doing well after playing many >games against a fixed opponent. I t almost always loses initial games against >any program ( mean inng any good program like f8, df7). > >To my mind, it shows that shredder depends on learn file heavily. Which is >something which dissappoints me as i look for a program which has a good >evaluation function rather than learn function. > >Any remarks will be very muchg appreciated. > >Amitesh Hi Amitesh! You probably know me as Magneto, Machiavellian or Yakovenko in the playchess server. It's true that Shredder behaves rather eratically and that's why i've stopped using it in favor of Deep Fritz 7. And Shredder often seems to be overconfident at times, if such a term could be used.
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