According to the inquired information, official website shows that "one gold and one billiards" means that the ball 1 and the ball 9 are on the table at the same time, and the player clears the table with one stroke, which is a billiards technique.
"One gold" means winning the championship, and "one billiards" means that the team or individual performs well in the game and has excellent skills. Here, "billiards" is popular in highly competitive sports because it requires superb technology and agile response.