A witness in a horse race-rigging case changed his story when he appeared in court yesterday, prosecutors alleged. Businessman Sam Chan Hung-yip's evidence differed from statements he gave to the Independent Commission Against Corruption, the District Court heard. Mr Chan, 32, told the ICAC he had visited a house in Windsor Park, Sha Tin, three times with accused Ng Siu-chau and four apprentice jockeys to discuss throwing races, it was claimed. He was also alleged to have described to investigators how Ng produced $1 million cash and suggested placing $500,000 on bets and sharing the rest among the jockeys. Mr Chan, a securities investment businessman, denied the claims yesterday, insisting he had been to the house just once with Ng and apprentice jockeys Yim Hin-keung, Chung Chim-ki, Alex Yu Kin-shing and Vickie Choi Chun-wai in April or May 1996. He said that after looking around the house, he returned to the sitting room to see Ng holding a bundle of $1,000 notes. He said Choi began playing with the notes, at which point Ng reprimanded him and the jockey handed them back. Judge Peter Longley granted an application by Assistant Director of Public Prosecutions William Lam Kui-po to treat Mr Chan as a hostile witness. Former police inspector Ng, 33, has denied seven charges of offering advantages to four apprentice jockeys in May 1996. He has also denied failing to give the ICAC details of his bank account. The trial continues before Judge Longley.