Sunderland is one of the most successful teams in English football, having won four Premier League titles and seven FA Cups in their history. Their tactical approach to defense has been described as "the best in the league" by many, with the team playing defensively well against any opposition. However, they have also been known for their ability to counter-attack, which has helped them achieve success on the pitch.

One of the key strengths of Sunderland's defensive system is their ability to play two central defenders behind their full-backs. This allows them to create space between the opposition and their own defence, while also allowing them to control the ball at both ends of the field. They are known for their quick passing and precise movements, which allow them to make accurate crosses and shots from distance.

In terms of their counter-attack opportunities, Sunderland is particularly good at creating space in the box. They are known for their ability to move players out of position and create opportunities through the air. For example, they have been successful in creating space in front of goal when they were playing without a goalkeeper, or in creating space inside the penalty area when they were using their back four.

However, there are some potential weaknesses to Sunderland's defensive strategy. One of the biggest challenges is their inability to deal with strong opponents. They are often beaten off the front line by teams that can score quickly, such as Manchester United or Liverpool. Additionally, their midfield players may struggle to keep up with the pace of the opposition, making it difficult for them to break down the opposition.

Despite these challenges, Sunderland remains one of the best teams in English football, and their tactical approach to defense is likely to continue to be effective in the future. With the right training and tactics, they could potentially become even more successful than ever before.