In the world of football, there is no denying that Girona has always been known for its tactical flexibility and ability to adapt to different opponents' tactics. The team's 5-Defender formation has proven to be particularly effective against strong teams, as evidenced by their recent success in the Champions League.

The formation was developed by coach Vicente Guerra and has since become one of the most popular tactical formations used by Girona. It consists of a 4-2-3-1 formation with a central defender at the back, two wingbacks on either side of the front line, and a left-back or right-back in the middle.

One of the key strengths of the 5-Defender formation is its ability to disrupt opposition defenses and create space for attacking players. By allowing the center of the field to have more freedom of movement, it can open up spaces for players to attack and score goals.

However, the effectiveness of this formation also comes with its own set of challenges. One of the biggest problems is the lack of depth in the center of midfield. Without enough players to cover the full width of the pitch, Girona's chances of winning games can be limited.

Another challenge is the need to balance the strength of the defense with the speed and agility of the attacking play. This requires the goalkeeper to be able to react quickly to changing situations and make quick decisions when needed.

Despite these challenges, the 5-Defender formation remains one of the most popular tactical formations used by Girona. Its versatility and adaptability have allowed the team to compete at the highest levels of European football, and its ability to create space for attacking players has helped them to reach new heights. As the season continues, it will be interesting to see how the team continues to develop and refine its 5-Defender formation.