Practicing this piece while having a cold, runny nose so that it did not dilivery enough oxygen to the brain. Therefore, it was not functioning properly. Tons of mistakes were made during the rehearsal.
Playing this piece in a bad, really bad, mood. Just wanted to concentrate on something, but I realised that I could played it decently three times in a row with my mind full of concern. Sometimes, the good thing comes out of the moment you don’t expect, and vice versa.