Master trainer Bart Cummings unveiled a potential topliner when two-year-old So You Think scored comfortably on debut at Rosehill on Wednesday.The sun was shining when So You Think won on a dead track but by the time they ran the last race, won by the Wanda Ings-trained Halfametreshort, the sky had turned black and the surface was downgraded to heavy after a downpour which lasted more than half an hour.So You Think is by English Derby winner High Chaparral and had little trouble with his opposit

Master trainer Bart Cummings unveiled a potential topliner when two-year-old So You Think scored comfortably on debut at Rosehill on Wednesday.

The sun was shining when So You Think won on a dead track but by the time they ran the last race, won by the Wanda Ings-trained Halfametreshort, the sky had turned black and the surface was downgraded to heavy after a downpour which lasted more than half an hour.

So You Think is by English Derby winner High Chaparral and had little trouble with his opposition which included stablemate Shamash who ran 1-1/4 lengths second in the Freeway Hotel Artarmon Handicap (1400m).

Stable foreman John Thompson said both horses were nominated for the Group One TJ Smith at Eagle Farm on June 6.

"I'm not sure if they are going that way, it's up to the boss," Thompson said.

"He's (So You Think) an exciting prospect and we're looking at him as a Derby horse later on.

"Shamash was a little bit disappointing."

Thompson was surprised to see So You Think racing midfield from his wide barrier, 10, and admitted that he was concerned after the horse was posted wide throughout the race.

"I thought you slaughtered him but he still won," Thompson said in jest to jockey Hugh Bowman in the winners' enclosure.

"His gate speed was a shock, we thought he'd be further back."

So You Think began so well that Bowman said he had no choice but to keep pressing forward even if it meant being caught wide.

"If I went back I would have to have taken him back five lengths but he was nice and relaxed where he was so I stayed there," Bowman said.

"He's a bit raw but he's certainly a horse with a bright future."

Meanwhile, Viscount three-year-old Altier gave trainer Greg Hickman something to cheer about when he stormed home first-up to win the Grey Gums Hotel Penrith Handicap (1100m) in the last bound with apprentice Tommy Berry aboard.

Altier is a half-brother to the former Hickman-trained He's Canny who lost his battle with laminitis nearly six months ago.

Two races later Berry's twin brother Nathan booted Dothis Dothat home in the Freeway's Friday Lunch Show Welter (1300m).

It was the first time the pair, who recently turned 18, have ridden winners on the same day at a metropolitan meeting.

"I haven't been riding in the city as much as Nathan but it's great that both of us had success today," Tommy Berry said.