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Universität Siegen

Lehrstuhl für Betriebswirtschaftslehre insb. Technologiemanagement

Prof. Dr. Ulf Lorenz

Unteres Schloß 3
Universität Siegen
57072 Siegen

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The chess program P.ConNerS

 

July 16th 2000: Chess program P.ConNerS won the 10th Grandmaster Tournament in Lippstadt (Germany)

On July 16th in 2000, it was the first time that a chess program could win an official FISE Grandmaster tournament. A draw against GM Philip Schlosser sufficed, such that the chess program P.ConNerS won the 10th Grandmaster Tournament in Lippstadt. In a field of 11 human players (2522 ELO on the average) and 1 computer, P.ConNerS was only beaten by the former Junior World-champion Roman Slobodjan and the experienced English Grandmaster Jonathan Speelman. After all, the program won the tournament with 6 wins, 3 draws and 2 losses. GM Hracek and GM Tschiburdanidse followed nearby [heise]. Even out of bad positions the program found ways of defense and shocked its opponents with sensational winning combinations.


Some data about P.ConNerS

  • Program author: Ulf Lorenz, at that time member of the research group of Prof. Dr. B. Monien at the University of Paderborn.
  • P.ConNerS was a pure test vehicle for experiments in the fields of selective game tree search and parallel computing. There was no commercial interests.
  • P.ConNerS stands for 'Parallel Controlled Conspiracy Number Search'. Thus, the tournament victory was highly interesting from a research perspective, as well: P.ConNerS used a non-conventional, non-alphabeta search algorithm. The search algorithm tries not only to maximize the search depth, but also tries to guarantee that even when one leaf-value changes, the result stays the same. A conspiracy 2 search may be interpreted as a special, global arrangement of a lot of so called singular extensions. As a result, it domain-independently searches highly selective and irregular game trees. The program is written in C.
  • P.ConNerS ran in parallel and got its playing strength out of a workstation cluster, which consisted of 160 Pentium II, 450 Mhz processors. Those were connected with a new European interconnection network, the so called SCI network. On that machine P.ConNerS examined between 3.5 and 5.0 Mnds/sec. On the 160 processors it achieved a speedup of about 50.

 

 

 
 
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Universität Siegen

Lehrstuhl für Betriebswirtschaftslehre insb. Technologiemanagement

Prof. Dr. Ulf Lorenz

Unteres Schloß 3
Universität Siegen
57072 Siegen

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© Universitätsbibliothek Siegen
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