The victory was so emphatic Bosson got to enjoy the adoration showered upon his mare.
He declared her the best horse he has ridden, while trainer Mark Walker suggested Imperatriz is keeping Bosson riding after years of weight battles.
The Manikato win goes a long way to financially justifying the decision of Walker and Te Akau boss David Ellis to skip the A$20m Everest in Sydney two weeks ago with Imperatriz. In this form, she may have even won that mega money slot race, but if she wins the A$3m Champions Sprint at Flemington on November 11, the financials will be more or less the same.
But with three Group 1 victories and without the risk of travel and upsetting Imperatriz, who clearly loves The Valley and Victoria, the right decision was made.
Imperatriz must now at least be in the conversation about New Zealand’s best 1000-1200m sprinters.
For years, that conversation has often brought up the name Mr Tiz, while greats such as Sunline (who won the Manikato in 2000) and Our Maizcay won major 1200m races but rarely raced at the true sprint distances as older horses.
More recently, Roch ‘N’ Horse, when trained in Australia, and Levante have done freakish things sprinting here and in Australia but Imperatriz has turned into a machine with much more to come.
While Prowess’ win wasn’t at the highest level, she undoubtedly is top class, as she overcame a interrupted spring campaign to win the Group 2 Crystal Mile while still on the up.
She was aided by a perfect Mark Zahra ride to trail and push out without losing momentum but also by her huge stride and plenty of heart and like Imperatriz, Prowess may still have her best raceday performances ahead of her.
●The New Zealand domination of The Valley was completed when ex-pat jockey James McDonald won the A$5m Cox Plate on Romantic Warrior.
McDonald produced the perfect ride to get the nose of the Hong Kong-trained galloper down on the line to deny former NZ horse Mr Brightside, who looked the winner with 50m to run.
Romantic Warrior gave McDonald back-to-back Cox Plates after he rode Anamoe to win the great weight-for-age race last year.