[elindauer]

Essentially every decision in this hand should be answered with a probability triple, which is why you are going to get all kinds of random answers to this thread, none of them convincing. Just call preflop, fold the flop, raise the flop, blah blah blah.

You're heads up against an unknown opponent. Always doing any of these is bad. The answer has to be a mixed strategy.

Unfortunately, I don't know what the mixed strategy is for each of these decisions, but perhaps I can start you on the path to finding it. Here's a guess at how I'd play it:

preflop facing a raise {0, 50, 50}

flop after having raised and being donkbet by this unknown {33, 33, 33}

See my post in the midhigh forum for more details.

good luck.
eric