He switched to extreme wet tires when everyone else was on older wet tires.
By taking a different racing line when planning his overtaking, he gained visibility and maybe even better grip.
Very skillful and fun to watch. When Massa crashed, he blocked the pit lane, otherwise Max would have come in earlier to change from intermediates and finished even higher.
This race and the last one I think Rosberg has had a bit of luck to get 2nd and not 3rd. I highly doubt he'll slip to 4th in Abu Dhabi.