This Semi-final is devoted to the four best runners-up from the initial 12 heats, and it is the last chance for a woman to make it to the Final. But there are three of them lined up against a lone male. So the odds should be in their favour. The contestants and their special subjects are:MARGARET ASKEW , journalist. The Life and Career of Stonewall JacksonJACQUELINE PEARSON. university lecturer. The Life and Works of Christopher MarloweGENA DAVIES, unemployed, Gemology ALAN BLACKBURN, law student, History of Northern Ireland from 1921