Originally Posted by northoceanbeach
.....I need a technique that can withstand anything. ......
There is really no such thing that can withstand anything. There are only techniques and anchors that are superior to others. You've already received good advice on scope, chain, anchor type, etc above. Ask, if any of it doesn't make perfect sense.
Then there is the inevitable standing watch. Someone just has to check at reasonable intervals. Technology has made this a science from an art. Website, like SailFlow
are pretty good a wind speed and direction for each hour overnight. Set your alarm and get up around to the time you will swing. There are also apps for iPhones, iPad, Droids, etc that will keep an eye on your gps location, while you sleep and alarm if you get outside the area you set as protected. Essentially, your smartphone stands watch for you. I don't know as I trust it 100%, but admit it makes sleeping much easier.
However, no one sleeps perfectly well on anchor on a windy night. If not for concern over dragging yourself, you worry that someone less diligent will drag into you.