It was a drama in many acts at The Oval for the fifth Test in 1968. Basil D’Oliveira changed the course of history by scoring 158 — his runs as much against Australia as against the forces of apartheid. And then on the final day Derek Underwood beat the rains and a stubborn Australian resistance to square the series. Arunabha Sengupta looks back at one of the most impactful Tests in history.