What if the anchor gets stuck under a rock?

Motor forward retrieving rode until your bow is above the anchor.  Typically a straight vertical pull will break the anchor loose.  In the event that the anchor is difficult to break loose, either due to severe weather or a hard clay bottom, don’t bog down the windlass (or strain your back).  Typically there will be some swell in the anchorage - every time the bow dips with the swell, take in a few inches of rode.  After several cycles, the buoyancy of the boat will have worked the anchor loose and you can easily retrieve.  In the event there is no swell, you can cleat off the rode and drive over the anchor with your motor to break it loose.  This will be the exception, however – most of the time a straight vertical pull will do the trick.