Approximately four minutes of quick-fire specialist and general knowledge questioning confronts four doughty contenders for this year's Mastermind title. Memory, clarity, concentration, tactics, and nerve are all required in this formidable challenge to the intellect. Tonight's contenders are: DENNIS BIRD, Civil Servant JACQUELINE PEARSON , postgraduate student MICHAEL MUNN , lorry driver MARTIN CABOURN SMITH , Chartered Accountant