Contenders from Glasgow, Edinburgh and Aberdeen strive for a place in the Mastermind semi-finals.To succeed they require the knowledge of the specialist, a wide range of general knowledge and the ability to think and act quickly under the pressure of time.Edinburgh University again provides the venue for tonight's contest.Contenders:ROBIN WALDEN, export manager Life and works of MichelangeloGAY SINCLAIR-GIEBEN, schoolmistress Scottish Wars of Independence 1306-1320ALAN BRUFORD, archivist The Hebrides to 1914MARTIN NICHOLS, retired neurosurgeon,Naval history 1793-1815