With Today's closest fight by eng in the series so far, India won the match by 16 runs under Duckworth/Lewis method to take a 3-0 lead in the seven-match series and Dhoni said the home team was always ahead even under the D/L method.
"So we were prepared, I had a chit of D/L calculations. Once we knew D/L method would be applied we decided to preserve wickets as we knew we were ahead and runs could be scored from the power play (to be taken by batting side)," he said after the match.

Dhoni said the pitch was a difficult one to bat on but his batsmen were up to the task by taking ones and twos and ensured that no wickets were lost once the D/L method came into picture.
Reports PTI
What is d/l Duckworth Lewis Method In Cricket ?
In the sport of cricket, the Duckworth-Lewis method (D/L method) is a mathematical way to calculate the target score for the team batting second in a one-day cricket or Twenty-20 cricket match interrupted by weather or other circumstance.
A simple example of the D/L method being applied was the first One Day International (ODI) between India and Pakistan in their 2006 ODI series. India batted first, and were all out in the 49th over for 328. Pakistan, batting second, were 7 wickets down for 311 when bad light stopped play after the 47th over.
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In this example, Pakistan's target had the match continued was 18 runs in as many balls, with three wickets in hand. Considering the overall scoring rate throughout the match, this is a target most teams would be favored to achieve. And indeed, application of the D/L method resulted in a target score of 304 at the end of the 47th over, with the officially listed result as "Pakistan won by 7 runs (D/L Method)".