ProbSy - A System for the Calculation of Probabilities in the Card Game Bridge

We present an application designated to the calculation of probabilities in the card game bridge. We describe in detail how a Bayesian network is dynamically generated depending on the case presented to the application. A communication language which simplifies the specification of certain kinds of evidence and the requests for probabilities of complex conditions is also presented. We explain how the probability of a strategy for declarer's play being successful is calculated by transforming the corresponding condition to disjunctive normal from. Finally, we give two examples which show how ProbSy can be used. 1 Introduction Bridge is a card game played by four players which are initially dealt 13 cards each. Each player is usually associated with one of the four directions of the world and they are organized in two pairs such that North and South are partners and similarly are East and West. The game consists of two phases, an auction and the play of the cards. During the auction ..