  The Ontology Alignment Evaluation Initiative (OAEI) is an annual evaluation
of ontology matching tools. In 2018, we have started the Knowledge Graph track,
whose goal is to evaluate the simultaneous matching of entities and schemas of
large-scale knowledge graphs. In this paper, we discuss the design of the track
and two different strategies of gold standard creation. We analyze results and
experiences obtained in first editions of the track, and, by revealing a hidden
task, we show that all tools submitted to the track (and probably also to other
tracks) suffer from a bias which we name the golden hammer bias.
