the thing about a black swan is that, by definition, it is not predictable. in some sense it may also not be defensible either. e.g., a fast spreading disease that wipes out 50% of the populationor more, a hollywood-like ecological/geophysical disaster that makes the planet uninhabitable, and so on. who cares about puts at that point?
that aside, when it comes to financial black swans they can also occur to the upside and so buying puts doesn't necessarily cover all the outs. to me the best approach is as vikas suggests - minimize your maximum risk/position size to a level that allows you to trade snother day. you can use a kelly criterion or modified kelly or simply just discipline yourself to stay under 2% or so of trading capital at riskat any given time. outside gamma (cheaply aquired)is also very desirable.
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