Hi Theo,
There has been some proprietary solutions around it. Did you see the last QL meeting slides? There you can see some of the problems arising.
I have started to mess up on a section of the portfolio sub-problem. Only the joint default so far, though with random recoveries and arbitrary copulas. Everything else to be done; exposures, pricing engines, collateral, netting, ... (i.e. not much done)
Best
Pepe
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