Lawro previews Barcelona v Chelsea: Why Blues must be mythbusters and netbusters
Roberto Di Matteo pulled off a tactical masterstroke to set up Chelsea's win over Barcelona in the first leg of their Champions League semi - now he must hold his nerve in the Nou Camp.
If it had been Jose Mourinho, in his early days at Stamford Bridge, who had masterminded last week's defeat of Barca, it would have been hailed as a stroke of genius.
But as it was 'only' Di Matteo, maybe Chelsea did not get the praise they deserved for a well-drilled, disciplined and impressive victory over the European champions.
Now, Chelsea must approach the second leg with their minds on scoring a goal.
You cannot just sit back and expect to soak up 90 minutes of pressure.
There is also a bit of a myth about how big the pitch is at the Nou Camp.
The pitch is 105m x 68m - the same size as the pitch Chelsea played on at the Emirates on Saturday and only two metres longer than the one at the Bridge.
It is about squeezing the space, but it's more about trying to stop Barcelona having the freedom in midfield to get into a rhythm.
While Barca's passing accuracy statistics were good last week, Chelsea shut down Lionel Messi and got in around Xavi and Andres Iniesta to stop them having space and freedom to play.
Jon Obi Mikel, Frank Lampard, Ramires and Raul Meireles worked hard, stayed on their feet, and were resolute enough to close down Barcelona's engine room.
Didier Drogba was the outlet and the defence held firm.
Juan Mata struggled to get into the game last week, but he can provide the inspiration this time.
The first leg was about being gritty, determined and, while Barcelona had chances, there was no way through.
It's unrealistic to think Barca won't score on Tuesday - it's a huge ask to keep a clean sheet.
That's why it's so important that Chelsea score themselves and force Barcelona to get three goals to win.