LONDON :South Africa's pack turned on the power in the second half to beat Argentina 29-27 at Twickenham on Saturday and win the Rugby Championship for the sixth time, ahead of New Zealand on points difference. The All Blacks’ 28-14 bonus-point win over Australia in Perth earlier meant that South African needed a bonus-point victory to win the title with clear water, though their overwhelming points advantage meant that any win would be enough. After an error-strewn start, however, they trailed