Just finished cleaning the bike. It took 2 washes to get the mud off from this weekend's race (which smelled just like cow dung). Also, I solved the case of the chain/spokes love making. On one of the running sections I must have banged the rear derailuer and bent the hanger on a tree or rock. That explains the chain into the spokes and the bad shifting afterwards. To summarize, it was not my mechanical ineptitude, it was my bike pushing incompetence.
This is the second case I solved this week. First one was the case of the missing beets.