**A SUNDAY TIMES BESTSELLER** 'He had the dream again last night... He taps the gloves of his unbeaten Polish opponent. There are rumours that the loser will be sent to the gas chamber.' In 1943, the Dutch champion boxer, Leen Sanders, was sent to Auschwitz. His wife and children were put to death while he was sent 'to the left' with the others who were fit enough for labour. Recognised by an SS officer, he was earmarked for a 'privileged' post in the kitchens in exchange for weekly boxing matches for the entertainment of the Nazi guards. From there, he enacted his resistance to their...