sentences:  Duff's profession as a teacher at Malvern College (where he was cricket master) prevented his playing more often; he was also the co-author, with George Chesterton, of a coaching book for young cricketers, "Your Book of Cricket".Born in Dunsley, Kinver, Staffordshire, Duff made his first-class debut in June 1959 for Oxford University against Essex, and had a decent game in a heavy defeat, scoring 53 and 4 with the bat and taking three wickets (the first of these being that of Gordon Barker).A few days later he made 40 against Free Foresters, then later that same month hit 55 not out against Warwickshire.