A STABLE supervisor with the Royal Hong Kong Jockey Club stands accused of accepting $300,000 from a riding boy in return for promoting his application for the position of assistant trainer. Wong Woon-kay, 40, has been charged by the Independent Commission Against Corruption with a count of accepting an advantage. He appeared in Sha Tin Court yesterday. Wong denies accepting the sum from Hung Wai-tak as an inducement to assist, or reward for assisting, Hung's application for the position of assistant trainer with the Jockey Club. The offence is alleged to have taken place on March 18, 1992. Magistrate David Duggan allowed Wong bail of $100,000 on his own recognisance and $50,000 in cash. Wong is to stand trial on October 24.