  This paper introduces the approaches we have used to participate in the WSDM
Cup 2023 Task 1: Unbiased Learning to Rank. In brief, we have attempted a
combination of both traditional IR models and transformer-based cross-encoder
architectures. To further enhance the ranking performance, we also considered a
series of features for learning to rank. As a result, we won 2nd place on the
final leaderboard.
