Why Hai Phong FC failed to maintain their defensive line against CAHN?

On the night of November 15, 2026, Lach Tray Stadium was strangely quiet. Only 8,000 spectators, less than half capacity, and I sat in section B, noting every movement. In the 68th minute, CAHN launched a quick counter-attack: Van Thanh received the ball in midfield, no one closed him down within 15 meters. He passed to Geovane, who had moved into the space between Hai Phong's center-back and left-back – a gap 12 meters wide, as if they had deliberately opened it. The third goal came from that, and I noted: "This is not an individual error, this is a systemic error." I have followed Hai Phong FC since 2026, from the night I stayed up watching France 4-3 Argentina, when I realized football is about space and decisions. In the 2026-2026 season, my hometown team was second from bottom in V.League with 7 losses in 8 away matches. But the loss to CAHN was not due to bad luck or individual mistakes – it was the result of a flawed tactical design from the start. This article will dissect why Hai Phong FC's defensive line became a fatal point, and what needs to change before it's too late. Season context: Head coach Chu Dinh Nghiem, who won V.League 2026 with Hanoi FC, brought a philosophy of ball possession and high pressing. But when applied to Hai Phong, a team with a low budget and thin squad, that philosophy became a burden. Data from VangBong.vn shows Hai Phong averaged 54% possession – third highest in the league – but conceded the most goals: 21 in 12 rounds. This paradox is not accidental. My analytical framework, built in 2026 when the Bundesliga returned with empty stadiums, shows that a high-pressing team needs three elements: fitness, coordination, and tactical reading. Hai Phong lacks all three. Their defensive line averaged 45 meters high, but their central midfielders – Trieu Viet Hung and Luong Xuan Truong – lacked covering ability. When opponents bypassed the first pressing line, they faced the center-backs directly with no shield. Result: 11 times opponents exploited the space behind the defense in just the CAHN match. Look at the 4-1-4-1 formation Chu Dinh Nghiem used. The position of Luong Xuan Truong – the lone defensive midfielder – was often pulled too high, sometimes touching the center circle. This created a huge gap between the midfield and defensive lines. When the ball was lost in the opponent's third, CAHN only needed one long pass to bypass the entire midfield. Geovane, with a top speed of 35 km/h, exploited this ruthlessly. I recall the match against Binh Duong in round 10, when Hai Phong lost 0-2. They had 61% possession but no shot on target in the second half. An empty stadium doesn't become poorer; it strips away the noise so data can speak. The data said Hai Phong didn't create chances because they pushed too high without a plan to attack. They occupied the ball but not the space. The problem isn't just the defense. The attack also has issues. Striker Rimario, with 4 goals in 12 matches, is the main scorer but he is often isolated. When the team pressed, the wingers – Nguyen Van Toan and Le Van Dat – did not drop deep to support, leaving a 30-meter gap between the lines. This created a stretched formation, easily torn apart by quick counter-attacks. I have analyzed all 12 matches of Hai Phong this season, and there is a repeating pattern: they concede goals between minutes 60-75, when fitness declines. In the CAHN match, the third goal came in the 68th minute, the fourth in the 82nd. This is not coincidence. The team's fitness – already lacking due to a congested schedule – cannot sustain high pressing for 90 minutes. When fitness drops, the line stretches, and spaces become wider. Compared to CAHN, a team with three times the budget and a better squad, they don't need high pressing. They chose a defensive counter-attacking style, waiting for Hai Phong to make mistakes. And Hai Phong made mistakes exactly as planned. This is the key point: Chu Dinh Nghiem did not adjust tactics based on the opponent. He applied the same formation to every match, regardless of strength and context. A match is a book; ordinary people read the conclusion, I read the footnotes. The footnote here is: Hai Phong lacks a true defensive midfielder. Luong Xuan Truong, despite good technique, lacks tackling and covering ability. He is often beaten in one-on-one situations. Data shows his duel win rate is only 48%, below the league average of 52%. The solution I propose – and have proposed since the start of the season – is to drop the defensive line by 15 meters, i.e., about 30 meters high instead of 45. This would reduce the space behind, while giving defenders more reaction time. Additionally, a defensive midfielder with better reading ability is needed – perhaps push Luong Xuan Truong up to central midfield, and use a younger, more physical player in this position. But Chu Dinh Nghiem did not do that. There is a counter-intuitive point I want to make: Hai Phong's problem is not the defense, but the midfield. They lack the ability to control the tempo. They press too high but have no one to keep the rhythm. When the ball is passed back, they don't know how to hold it to breathe; they rush to attack and lose it immediately. This creates a vicious cycle: the more they lose, the more they press, the more energy they spend, the easier they are to exploit. I recall a match in the First Division in 2026, when I followed Phu Dong Club – a small team with a modest budget – they chose a mass defense style, accepting less possession but being very hard to beat. They finished the season in 5th place, a success far beyond expectations. That shows tactics must fit the squad, not impose a luxurious philosophy. Hai Phong FC is facing the risk of relegation. They have 11 points after 12 rounds, 4 points behind the safety zone. The upcoming schedule includes matches against top teams like Hanoi FC and Binh Duong. If they don't change, they will fall into a spiral with no way out. But I believe there is still a chance, if Coach Chu Dinh Nghiem is willing to listen to data. I don't predict; I see the causal chain lining up. That chain is: if Hai Phong continues to push high, they will continue to concede. If they drop deep, they can survive. But the change must come from the coach, not the players. In the CAHN match, I saw a notable moment in the 85th minute, when the score was 0-4. Hai Phong still pushed high, still pressed as if they were leading. This shows there was no adjustment from the coaching staff. This is an alarming signal: not only is the tactic wrong, but there is also a lack of flexibility. Every formation becomes outdated at minute 70; the good ones adjust it in their minds. Chu Dinh Nghiem – who once succeeded with Hanoi FC – seems to have lost that ability. Perhaps he is stubborn with his philosophy, or perhaps he lacks the data to see the problem. But as an analyst, I see it clearly. Look at the numbers of other teams. Thanh Hoa Club, currently 3rd, has only 47% possession but the best defense in the league with 10 goals conceded. They don't press high; they play a tight zonal defense. That shows there is no single formula for success. Hai Phong needs to learn from its own history. In the 2026 season, when they won the National Cup, they played a 5-3-2 formation, solid defense and sharp counter-attacks. They didn't need possession, they needed efficiency. Now, they are trying to become a different team, and that is killing them. I believe Coach Chu Dinh Nghiem needs to review his entire tactical approach. He can keep the possession philosophy, but must adjust based on the current squad. For example, use two defensive midfielders instead of one, to increase defensive solidity. Or play with three center-backs, to add security. But the problem is not just tactical. Psychology also plays a role. Hai Phong players seem to lack confidence after a series of defeats. They fear making mistakes, so they play timidly, not daring to make bold passes. This creates a constraint, preventing them from executing their style. One player I rate highly is young left-back Nguyen Van Hung, 20, with speed and good reading ability. But he is often left alone in defensive situations because no one supports him. If Hai Phong drops deep, he will have the chance to show his ability. I have written about this issue since the start of the season, and I will continue to write. I write slowly, watch fast, and trust data more than promises. The data says Hai Phong is going the wrong way. But I also believe there is still a chance to correct it. In the upcoming match against Hanoi FC, Hai Phong will face a team with a similar playing style – high pressing – but with far superior player quality. If Hai Phong continues to push high, they will lose easily. But if they drop deep and accept defending, they may have a chance. I am not sure what will happen, but I know data never lies. And the data is saying Hai Phong needs to change immediately. Finally, I want to emphasize: Vietnamese football should not mechanically apply European tactics. The context of pitches, youth training, player psychology – all are different. Hai Phong is a prime example of wrong application. They need to find their own path, suited to their strength and culture. I will continue to follow and analyze. And I hope Coach Chu Dinh Nghiem will listen, before it's too late.