Author: Shep
Date: 00:54:52 07/19/99
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On July 17, 1999 at 16:10:49, Frank Müller wrote: >On German commercial Shredder site >http://www.computerchess.de/shredder/news.html you will find the following >position: >5n2/B3K3/2p2Np1/4k3/7P/3bN1P1/2Prn1P1/1q6 w - - >If you set Shredder's selectivity tab on maximum value, Shredder will indicate >mate in 30 within few seconds. My Hiarcs 7.32 and Fritz 5.32 programs, however, >are not able to find this solution. Does Shredder have an advantage over Hiarcs >or Fritz in this kind of positions? Well, I know that this kind of examples are >not the only criterion to evaluate common strength of a chess program, but >nevertheless, it is quite interesting. Who can help me with some own experiences >with regard to selectivity settings in ChessBase programs? Thank you very much >for your help. Hiarcs will probably never find this solution. The reason is that its maximum search depth seems to be 30 (or 31) ply. I don't remember Fritz' max depth, but I think it was somewhere between 45 and 55 ply. (Position 1 from the Albillo test suite is a good measure as most programs search it to their maximum depth within a few seconds to one minute.) So any program with a maximum search depth <60 ply will not find the mate, obviously. Rebel is one of the few commercials with such a high search depth (Shredder can bet set to 99 ply). --- Shep
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