 Complete the following phrase:  Cliff Thorburn made the first maximum break of the World Championship in 1983 during his second-round match against Terry Griffiths. The importance of this achievement at the time is demonstrated by the fact that play was stopped on the other table. This was the break that gave the World Championship one of its most iconic words of commentary, oh, good luck mate on the final black, courtesy of Jack Karnehm. Thorburn beat Griffiths in a final-frame decider, a match that finished at 03:51, the latest-ever finish for a match at the Crucible. Thorburn then also won his quarter-final and semi-final matches in the deciding frame; exhausted, and deflated by the news that his wife had suffered a miscarriage, he faced a one-sided final against Steve Davis who won 186. The 