After being suspended for the previous two weeks, Bosson was overweight for his first two booked rides and was touch and go to even ride Melody Belle at her 57kg.
He dropped at least 2kg on the day to make weight, with Jonathan Parkes on standby to ride the mare.
Bosson could barely speak on weighing out, with the pre-race chat with Melody Belle's connections all but non-existent, and there was more drama when Sinarahma missed the start by 10 lengths.
With Rock On Wood's mid-race retirement and Sinarahma's setback, the race was Melody Belle's to lose but she needed all of her champion qualities to claw past Sinarahma after she staged a staggering comeback to catch the field and then hit the lead at the 200m after cutting corners.
It is easy to make the case she should have won but champions such as Melody Belle don't make mistakes and that was the difference.
Although equalling Sunline's record is special, Melody Belle will be a hot favourite to beat it in the $400,000 Herbie Dyke Stakes at Te Rapa on February 13.
Bosson will be able to ride her as he avoided suspension for missing his two overweight rides, being fined $2000 instead.
Although trainer Allan Sharrock was left lamenting his bad luck with Sinarahma, he snared the race he hoped he could win when Waisake captured the $250,000 Wellington Cup (3200m) an hour later.
The long-striding son of Zed surged late after a perfect Sam Collett ride to grab $126 outsider Bluey's Chance.
It was the culmination of an eight-month plan to get Waisake in to the race with a winnable weight, and although the 6-year-old has now come of age, Sharrock says he will likely bypass the Auckland Cup in early March.
"The Auckland Cup suits those speed stayers, so we will probably head to the Adelaide Cup instead."
