Semi-log enrichment curves evaluating the ability of flexible (solid dark) and rigid (dashed light) docking screens to highly rank annotated ligands against ten target structures. The performance of random selection is shown in as a solid gray line. The structures screened were A. Holo DHFR, B. Apo DHFR, C. Neutral endopeptdidase, D. Holo thrombin, E. Holo TS, F. Apo Phospholipase C, G. Holo Adenosine Kinase, H. Apo Adenosine Kinase, I. Holo acetylcholinesterase, J. Apo acetylcholinesterase.