Author: Dann Corbit
Date: 10:53:34 08/22/03
Go up one level in this thread
On August 22, 2003 at 12:52:23, Tord Romstad wrote: >On August 22, 2003 at 12:12:42, Uri Blass wrote: > >>On August 22, 2003 at 11:56:42, Tord Romstad wrote: >> >>>50 million nodes is a lot. I think most modern programs (even weak ones) >>>should solve this a lot faster, and I'm sure Spector would too if you >>>had continued developing it. >> >>I think that you overestimate other programs. >>I believe that a lot of programs need more than 50M nodes > >Perhaps. But so far, Shredder is the only example we have seen. > >I still think the majority of modern programs should find this in >5M nodes or less, but I could be wrong. My own program is not very >good at finding mates (nor any other type of tactics), and I would >expect most other programs to be faster. Shredder pretty much beats the snot out of everybody. Maybe 50 million nodes is the best way to go. >>Maybe you do not use enough pruning so you can solve it fast. > >I never prune checks; this seems too dangerous. > >Perhaps Shredder is using an asymmetric search, and prunes some checking >moves at even plies when it considers itself to have a winning advantage? >What happens if you make the move Qh5+ and let Shredder analyse the >position? I don't have Shredder, but my guess is that it will find >the mate very quickly if you first execute the right first move. > >>I believe that solving it too fast is a mistake because it means that in a lot >>of cases you extend bad lines. >> >>The fact that a program can solve it is not enough and we need other positions >>to know if it is better in tactics. > >Of course. > >>It is easy to be able to solve some positions that you planned to solve but >>to fail in positions that you did not plan to solve them. > >Absolutely. Tuning the program to perform well in some finite set of >tactical test positions is definitely not a good idea. > >Tord
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