Katalyst is finally set to make her debut under rules on Thursday, after going through some extra training at home before passing her recent stalls test with flying colours. 

Since passing the test, she's been working at home with some older horses, to prepare her better for when she heads out onto the racecourse proper. In his latest update, Chris Grassick earmarked this race at Chepstow as the one he wanted to target for Katalyst's debut, as she'll be up against other fillies at a course where she can learn a bit more about running at undulating tracks as opposed to a flatter track like Newbury, where she was initially meant to make her debut.

Check out the video from David Stevens to find out more.