World Cup live: Australia v South Africa

Changing pitches has not been good to my systems! 17-0 to Australia. 25 minutes gone.

Australia dominating the attack - and over for a fourth try - bonus point. Debby Hodgkinson. 22-0. Australia need to win by around 56 points to qualify head of Canada... as long as Ireland don't get more against Kazakhstan. Try converted by Nicole Beck.

Good restart by South Africa - great break by Phumeza Gadu, but once attack breaks down no-one back for the Australian kick. Poor positioning.... and from the lineout a fifth Australian try. 31-0 as the try is converted.

Inexperience is telling against the South Africans. When they have ball in hand they can be fast and exciting, but once it breaks down they have problems. A major problem seems to be that they play essentially the same game as Australia, but are not as good at it. A much better few minutes for the Africans, but now back in their own half with little to show from it. Even so, Australia's weakness in forwards still evident - if only South Africa could use it. Once it gets into Australian hands, however, South Africa are in trouble.

Australia in trouble with referee again near end of first half. Warning for dangerous play - but no cards, and its  31-0 at the beark.

The second half continues - but South Africa are tiring. Tries from Hargreaves, Williams and Morgan in the first 15 minutes takes the score to 50-0. Canada's semi-final position is now under real threat. To their credit, the SouthvAfricans are not giving up, but their style of play is ideal for the Wallaroos. Another try, and with about 15 minutes left Australia are on the verge of overtaking Canada.

Gadu - another great run down the touchline, only a last minute tap saving Australia. Then, with the clock on 40minutes, Kanuk for Australia was away and clear... and dropped the ball over the line. Then, from the final play of the game, Sharni Williams has gone over. Australia are in the semi-finals, Canada are out