With her right foreleg bandage coming loose and flapping, Hayden Tinsley managed to squeeze that little extra out of Fastneck Rock filly Planet Rock and she got home by half a head from the game Abeautifulred.
Capital Diamond battled on for third two lengths away.
Planet Rock became the first Riccarton-trained winner of the NZ 1000 Guineas since the aptly named Canterbury Belle in 1984.
And now the Williams head north to the Karaka complex, close to Ellerslie where they have had their biggest successes with a 1988 Auckland Cup with Sea Swift and the 1996 Railway Handicap with Loader.
The race was robbed of some of its interest when Don Sellwood's widely fancied Anabandana was scratched because of the heavy going.
Favourite Blood Brotha outstayed another wet tracker Jungle Boy to win the Group 3 Christchurch Casino New Zealand Cup in the other feature race at Riccarton yesterday.
James McDonald had Ray Connors' Wanganui-trained 6YO gelding settling midfield for most of the journey among a group of favoured runners, including fellow northern raiders Showcause, Fast Love and Titch.
Southerner Hand of Fate tookover from early leader Seaflyte with a 1000m to go and as the field spread out around the bend he was joined by Jungle Boy, Blood Brotha and Yours, who sorted themselves down the straight.
In the end Blood Brotha justified his favouritism, by outlasting Jungle Boy and a game Hand of Fate.