Increases scientific return from Chandra by providing a public database of optical multicolor imaging well-matched in depth to selected Chandra X-ray fields. Uses only public archival Chandra data, or proprietary data offered by explicit consent of the GO/GTO . ... to GO/GTOs immediately after images of their fields are reduced, if our request for early access to X-ray data is granted 1 . ... that are not intended as serendipitous survey fields (e.g. Chandra deep survey fields) . ...