His best performance in the debut season came at the 2006 Grand Prix in October in Aberdeen. During that tournament he impressed, winning 4 of his five matches during the group stages. His only loss came against John Higgins. However he failed to make the top two as both Higgins and Alan McManus, who Kachaiwong had beaten, had better frame differences. He was the only player who won four times in the group stages who did not make it through to the knockout stages. The rest of Kachaiwong's results was not good enough to keep him on tour, but he was handed a wild card for another season. Despite a last 64 run at the season-ending World Championship, he was again relegated.