The Chinese League Soccer (CSLL) Round 21 match analysis and prediction for Dalian faced with Beijing is as follows:

Firstly, we should mention that the two teams have been in good form this season. Dalian FC has won five out of seven matches, while Beijing Guoan has also been victorious in five of their six games so far. In terms of goals scored, both teams have been averaging over three goals per game.

In terms of tactics, Dalian FC has been playing a more attacking style of play, with their players being able to create chances on the break. Meanwhile, Beijing Guoan has been playing a defensive style of play, with their players being able to defend well but not conceding many goals.

On paper, Dalian FC's team selection looks strong, with players like Zhang Xuan, Liu Zheng, and Zhao Shuang all having impressive performances throughout the season. However, the key to success will be how they handle the pressure from the opposition. Dalian FC may face a tough challenge against Beijing Guoan's defensive strength, but they can still come out on top if they manage to exploit their strengths.

Overall, it seems that Dalian FC is a strong team, but they need to improve their performance on the field in order to secure a victory. On the other hand, Beijing Guoan has a formidable defense and a talented squad, which makes them a real threat to any opponent. Both teams will need to perform at their best in order to take down each other in the round.