Chance Bye, the fairytale filly of this year's autumn carnival, has suffered a setback in a jumpout at Kembla and trainer Michael Tubman is unsure when she will return to the races.The Silver Slipper winning-filly was being set for a return in the San Domenico Stakes (1000m) at Randwick on August 7 but on Wednesday sustained a deep cut to her hind leg on the coronet band.Tubman said the filly's immediate future was "up in the air" until he could solve the problem.It is something he said he has h

Chance Bye, the fairytale filly of this year's autumn carnival, has suffered a setback in a jumpout at Kembla and trainer Michael Tubman is unsure when she will return to the races.

The Silver Slipper winning-filly was being set for a return in the San Domenico Stakes (1000m) at Randwick on August 7 but on Wednesday sustained a deep cut to her hind leg on the coronet band.

Tubman said the filly's immediate future was "up in the air" until he could solve the problem.

It is something he said he has had to manage throughout Chance Bye's career.

"It's a problem I have had all the way through but I thought I had solved it," Tubman said.

"She whacks herself either when she comes out of the barrier or when she changes gears.

"It's just one hit but it's in the wrong spot. She did it in her first trial coming out of the barriers because she didn't know what she was doing. All she ever did was take the scab off since then - she did it again in the Golden Slipper."

Tubman had changed Chance Bye's shoes and hadn't had any further problems with the filly until she cut herself again on Wednesday.

"This morning I told (jockey) Kathy (O'Hara) I wanted her to have a real good hitout and she did it again," Tubman said.

"It's not a breakdown or anything but it's potentially a big problem that I've got to fix."

Chance Bye captured the imagination of Sydney racegoers earlier this year, winning her first three starts before lining up in the Golden Slipper in which she finished ninth.

The daughter of Snitzel won the Inglis Nursery (1000m) by 3-1/2 lengths on debut last December before stepping out at Rosehill on January 23 to win the Inglis Classic (1200m) by the same margin.

At her third start Chance Bye showed sustained speed again to win the Group Two Silver Slipper (1100m).

A $15,000 yearling purchase, Chance Bye has won $523,700 from her four starts.