There is one certainty at the end of the fourth day in Mohali: there will be a winner. It left the Test finely balanced; India required 161 runs with Sachin Tendulkar at the crease on 10 and the night-watchman Zaheer Khan on 5. Australia needed six wickets, but they also knew that VVS Laxman, who batted at No. 10 in the first innings, would again be hampered by his bad back when he eventually came to the crease. Much will depend on Tendulkar and MS Dhoni.The target seemed small enough, but if the hosts triumph it will be the fourth-highest successful chase in Tests in India. The loss of Gautam Gambhir to a dodgy lbw decision – Billy Bowden failed to spot an inside edge – in the first over from Hilfenhaus gave the Australians a spark.Doug Bollinger helped out with the wicket of Rahul Dravid, who edged behind for 13, before Hilfenhaus bounced out Virender Sehwag (17) and Suresh Raina for a duck, both men caught in the cordon fending away chest-high deliveries. The extra bounce was a pleasing sign for Australia's fast men, after there was little assistance for the bowlers on the first three days.Earlier, the Australians began the fourth day in a positive mindset, carrying their 23-run first-innings advantage. A brisk half-century from Shane Watson rapidly took the lead into triple figures, before Ishant provided the first turning point of the day with three wickets in two overs just before lunch.In truth, Ishant's first wicket was more luck than outstanding bowling, as the aggressive Watson bottom-edged his attempted pull into the stumps and departed for 56. It was just the boost that Ishant required after a first-innings hampered by injury and inconsistency, when he took 0 for 71 from 11.4 overs.Harbhajan got his man when North was caught at silly point for 10, his sixth failure in his past three Tests. In Harbhajan's previous over he had removed the obstacle of Hussey, who was leg before for 28, although he was unlucky as the fullish ball had pitched well outside the leg stump.Harbhajan and Ojha had strangled Australia's runs, and they were starting to kill off the batsmen as well. Tim Paine was caught in close off Ojha straight after tea, before Zaheer produced a fine display of old-ball swing by rattling through Australia's last three wickets to dismiss the visitors for 192.It looked like a professional enough job to hand victory to India, until Hilfenhaus proved he could match the effort. By the close of play, any punters expecting rain could find odds of 101-1 for a draw. It would be a very unwise gamble.