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Firstly, let's talk about the Chinese FA Cup. The Chinese FA Cup is one of the most prestigious football competitions in China, which is known as the "Premier League" of China. It is organized by the Chinese Football Association (CFA) and is played every two years, starting from the 2019-20 season.

The Chinese FA Cup has four rounds: the group stage, the round of 16, the round of 8, and the final. In each round, teams play against each other in three-legged matches, with the winner advancing to the final.

In the first leg, both teams play in their own home stadium. The game ends after a period of 90 minutes if neither team scores. If either team scores, the match continues until one side wins 3-0 or loses 2-1. The next day, the teams play again at their respective stadiums, and so on, until one team is eliminated and the other team advances to the final.

As for the second leg, both teams play at their respective stadiums. The game ends after a period of 90 minutes if neither team scores. If either team scores, the match continues until one side wins 3-0 or loses 2-1. The next day, the teams play again at their respective stadiums, and so on, until one team is eliminated and the other team advances to the final.

In summary, the Chinese FA Cup semifinals feature four rounds of competitive football, with each team playing against each other in three-legged matches. The first leg usually features a draw, while the second leg involves elimination. The final round typically consists of two legs of the same type, with the winner advancing to the final. Overall, the Chinese FA Cup semifinals are a highly competitive and exciting event that showcases the best talent in China's top leagues.