Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: The notorious underarm delivery that created one of the most controversial moments in world cricket history is still hard to revisit after more than three decades. But as Australia and New Zealand go head-to-head in the World Cup final at the Melbourne Cricket Ground on Sunday, the underarm bowling incident from 1981 will inevitably come back to haunt. The controversial bowl triggered a cold war between the two nations after the infamous day on February 1 when New Zealand needed six runs with one ball remaining to draw the match. But Aussie skipper Greg Chappell instructed the bowler, who was his younger brother Trevor, to deliver the ball underarm in a bid to prevent batsman Brian McKechnie any chance of hitting a six.The notorious underarm incident triggered a massive uproar in 1981New Zealand was six runs with one ball remaining to draw the matchBut Aussie skipper Greg Chappell ordered the bowler, who is his brother Trevor, to deliver the ball underarmThe underarm bowling was not ruled as illegal at the timeAustralia and New Zealand go head-to-head in the World Cup final at the Melbourne Cricket Ground on Sunday 
 Question:Australia went on to win the match but the hell that followed left the _ brothers struggling to cope under the pressure from the backlash.

Greg Chappell