Australia need to overcome the deficit before they can start to accelerate the run-rate, preferably before half-way through the final session. They can't afford to lose another wicket before getting to 189.
Need to get to at least 300 to put pressure on India, 350 would be more ideal. Don't want to be chasing too much on the final innings on this pitch, especially as it starts to deteriorate.
There is no way MMarsh makes it to tea. He has over 3 mins to make a mistake.