Natural Language Processing With Prolog in the IBM Watson System – Association for Logic ProgrammingAbstract On February 14-16, 2011, the IBM Watson question answering system won the JeopardyMan vs. Machine Challenge by defeating two former grand champions, Ken Jennings and Brad Rutter. To compete successfully at Jeopardy!, Watson had to answer complex natural language questions over an extremely broad domain of knowledge. Moreover, it had to compute an accurate confidence in its answers and to
