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Application of abduction to computer bridge

This paper proposes a method using the hypothetical reasoning for locating missing high cards in the game of bridge. Beginner knowledge for bidding and leading cards is represented by constraint logic programming language CHIP. Observation as to whether one leads with the king of hearts is given as a part of query. Then hypothesizing as to the possession of the ace of hearts is generated by abduction and integrity constraints are checked by consistency techniques in CHIP. A system based on beginners' knowledge is as powerful as an expert system used for the same purpose.