Quote from spindr0:
I think the answer depends on how you define credit spreads, Black Swan and protection. The first one is easy. If you're writing bearish credit spreads, you're golden. The latter two aren't as easy.
If you deem a Black Swan as a one day even with no warning, say 9/11, then you must have your protection in place. No ifs ands and lots of puts. Same holds true for the crash of '87 if you view it as a one day event.
If you view the crash of '87 in terms of a two month down market and then a one day crash, there was plenty of warning and time to act prudently. The same holds true for last year's market debacle which started in the 4th quarter of '07 (even earlier in some sectors).
With warning, you have several choices. Day to day losses can be cut by closing positions. Add'l cheap protective OTM legs can be added. Profitable legs can be rolled in order to generate more premium on the other side.
Keep in mind that it's generally a losing battle to attempt to defend a position that's directionally wrong. You can mitigate a lot of the damage and soften the blow but it eventually takes a good rebound to get back to even if you haven't thrown in the towel... But at least a losing battle is a lot better than sitting there like a deer in the headlights allowing your a/c to lose a substantial amount. That's a big no no.