Introduction: The Chinese soccer club Shanghai Shenhua has introduced a new set of rules for its U23 players, which have been met with mixed reactions by fans and the media.

The new rule allows players to wear black or white jerseys, instead of their usual orange jersey, during training sessions and matches. This move is seen as a positive step towards improving the team's performance on the field, but some fans and critics argue that it may limit the team's ability to play in certain conditions.

One supporter of the new rule argues that it will allow the team to focus more on defense and less on offense, while others believe that it will hinder the team's chances of winning games.

On the other hand, supporters of the old rule argue that it will make it easier for players to get into the match, and that it will give them more time to rest and recover from injuries.

Despite these differences, many fans and analysts agree that the new rule is necessary to improve the team's overall performance. It will help the team to adapt to different playing styles and conditions, and it will also give players more opportunities to work together and support each other.

In conclusion, the new U23 player appearance rules have been met with mixed reactions among fans and the media. While some fans and critics argue that they will help improve the team's performance on the field, others argue that they may limit the team's ability to play in certain conditions. Ultimately, it remains to be seen whether the new rule will be implemented successfully and whether it will lead to any significant changes in the team's performance.