 Complete the following phrase:  In the 1985 final, also known as the black ball final, Dennis Taylor beat Steve Davis 1817 on the final ball of the final frame, in one of the most closely contested matches of all time. It finished at 00:19 and, with an audience of 18.5 million, it remains the most-watched programme in the history of BBC2, and holds the record for a post-midnight audience for any channel in the United Kingdom. Davis met sixteenth seed Joe Johnson in the 