Completeness of the MaxBCG, GMBCG and AMF galaxy cluster catalogs as a function of redshift and mean X-Ray surface brightness, I_X,500 On the right of each figure is the completeness scale. All traditional cluster detection algorithms applied to SDSS are less complete that redMaPPer and YOLO–CL (see text), except AMF, which has a performance similar to redMaPPer, and WHL12, which has a performance similar to YOLO–CL.