As a footnote to Drowning By Numbers (the film), and with his customary intelligence, humour and causticity, Peter Greenaway has undertaken to comment in 100 chapters on the story, the sub-plots, the creation and the possible continuations of his film. Drowning by Numbers is the story of three women who drown their husbands - one in a bath, one in the sea and one in a swimming pool. It is an affectionate, ironic tale of male impotency in the face of female solidarity. What is the male defence. to play games? For them, any event is a good excuse for a game. Even - and especially - death.