This paper presents the Sixth Recognizing Textual Entailment (RTE-6) challenge. This year a major innovation was introduced, as the traditional Main Task was replaced by a new task, similar to the RTE-5 Search Pilot, in which Textual Entailment is performed on a real cor-pus in the Update Summarization scenario. A subtask was also proposed, aimed at detecting novel information. To continue the effort of testing RTE in NLP applications, a KBP Validation Pilot Task was set up, in which RTE systems had to validate the output of systems participating in the KBP Slot Filling Task. Eighteen teams participated in the Main Task (48 submitted runs) and 9 in the Novelty Detection Subtask (22 submitted runs). As for the Pilot, 10 runs were submitted by 3 participants. Finally, the exploratory effort started in RTE-5 to perform resource evaluation through ablation tests was not only reiterated in RTE-6, but also extended to tools.
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