It's interesting how football formations have evolved in the Premier League over the past 20 years.
Back in the 1990s, most managers opted for four defenders, four midfielders and two strikers in a standard 4-4-2 system, which is rarely seen nowadays.
Ten years later, in the mid-late noughties, and teams started using a 4-3-3 or 4-2-3-1 formation with just a single striker.
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Chelsea had Didier Drogba, for example, while Liverpool had Fernando Torres and Arsenal had Robin van Persie.
Systems using a sole striker have largely dominated English football ever since but quite recently, the 3-4-3 formation has re-emerged.
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Antonio Conte started the trend at Chelsea this season, using David Luiz, Gary Cahill and Cesar Azpilicueta as centre-backs and Victor Moses and Marcos Alonso as wing-backs.
Arsenal and Tottenham have also jumped on the bangwagon, albeit to varying degrees of success, with Arsenal deploying three centre-backs in last Sunday's north London derby.
One formation that will never catch on, though, is 1-0-9, whereby a team plays with just one at the back and nine players up front.
Bundesliga side RB Leipzig are famous for once taking kick-off in a 2-0-8 formation, but no one in their right mind would opt for 1-0-9, right?
Well, if FIFA 17 is anything to go by, maybe it's a risk worth taking.
YouTuber Rich Leigh recently conducted an experiment to see how Manchester United would fare in the Premier League using just one player at the back.
In the video below, Rich starts the season with only Eric Bailly in defence and the likes of Wayne Rooney, Zlatan Ibrahimovic, Marcus Rashford, Anthony Martial and Henrikh Mkhitaryan up front.
And the results are staggering. After signing Cristiano Ronaldo, Kylian Mbappe and Sergio Ramos to replace Bailly as his only defender, Rich simmed a full season to see what happens. Check it out.
That's right, United actually won the Premier League with one at the back.
The Red Devils started the season with a 3-1 victory over Leicester City in the Community Shield before winning 25 league games en route to the title, conceding only 30 goals.
David de Gea recorded the most clean sheets (13) while Paul Pogba was third top goalscorer (16).
United also won the FA Cup but exited the EFL Cup at the quarter-final stage and lost to Paris Saint-Germain in the semi-finals of the Europa League.
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