Sydney's champion trainer Chris Waller will gang tackle rival Peter Snowden's lone starter Scarf in Saturday's $100,000 Winter Challenge at Rosehill with a team of five horses.

The Australian Turf Club will officially honour Chris Waller's feat of joining an exclusive list of trainers to prepare 100 Sydney winners in a season with a presentation after Race 2 tomorrow (Saturday) at Rosehill Gardens.

Testarhythm, unbeaten in two starts since resuming, will race against his own age at Rosehill in preference to a black type start in the Winter Stakes.

Rain Affair comes back after a good trial