HONG KONG'S visually impaired bowler Carlos Antunes criticised a change in the Commonwealth Games rules which he said denied him a gold medal in Victoria. Antunes, 54, who won a singles bronze medal, said the rule change nullified all his training over the past six months. Scotsman Robert Brand took the gold medal over Australia's John Hubbard. He said he has been training with a white nylon line stretched lengthways across the middle of the green, which gives him an idea of how he stands in relation to the symmetry of the rink. But upon his arrival in Victoria, he discovered that organisers changed the rules allowing for only a green line to be placed on the playing surface. ''I'm not happy with a bronze, I came here for the gold,'' said Antunes, who can only see a few yards and is directed in matches by his wife Alice. ''I can't see the green line because it is the same colour as the rink. I have to reach down and touch the green to feel for the line. ''I've been training all these months with a white line.'' Antunes felt he would not have lost to Hubbard in his final preliminary match had they played with a white line. He also criticised the rule which prevents the visually impaired bowlers from walking up to the head to examine the wood positions. He believes it was a significant disadvantage to him as he said that Hubbard was able to see as far as the jack. Antunes was a silver medallist at the 1989 World Championships and a gold medallist at the 1990 Pacific Games in Japan. For Sunny Tang, who also won a bronze in the women's visually impaired singles competition, it was a remarkable achievement. Her marker, Patricia Mak, said the 41-year-old Tang took up the game only two years ago. Mak said: ''She has played many of the bowlers who are competing in Victoria before. She used to lose to them but is now better than them.'' The women's singles was won by New Zealander Catherine Portas, who beat Gloria Hopkins, of Wales, in the final.