Pattaya - One-hundred-and-thirty-one Optimist dinghies competed at the 2018 Top of the Gulf Regatta in Pattaya, all vying for top honours in the Thailand Optimist National Championships, and the three-day competition was fierce, with reigning champion Panwa Boonak (THA) looking to hold off strong challenges from fellow Thai juniors and many of the best young sailors from around Asia.