Victoria Coren Mitchell asks the questions as the Whodunnits take on the Corkscrews in the first of the quarter-final matches, with a place in the semi-finals at stake. They must use patience, lateral thinking and sheer inspiration to make connections between groups of four things that may appear at first not to be linked, with one set of clues consisting of Roland-Garros, Chicago O'Hare, Lindy Hop, and Orville the Duck.