No calculators are needed to work out the task facing Ghana in Tuesday's final Group B game - a win and nothing else is required against Burkina Faso if the four-time champions are to make it through to the CAF Africa Cup of Nations quarter-finals.
The Black Stars are sweating on the results of a scan to the injured knee of Michael Essien, a player of such influence that his absence could make or break their Cup campaign. Essien, who only played a bit part in his country's opening 3-1 loss to Côte d'Ivoire, hobbled out of a training session on Sunday and was taken to hospital for tests.
Ghana's media officer Randy Abbey told AFP: "Michael suffered a right knee injury in the training session this morning. He was taken to a local hospital for a scan and we'll get the results back tomorrow and then have a clearer idea of whether he can play."
Essien's absence would be a colossal blow to Ghana who face Burkina Faso at the 50,000-seat November 11 Stadium in the Angolan capital. Ghana are one point behind Burkina Faso who put themselves in a sound position to qualify when coming away from their opening game against Côte d'Ivoire with a goalless draw and a precious point.
Essien arrived in Angola late for the tournament because snow delayed his flight from London and has been struggling to recover from a hamstring injury sustained playing for Chelsea in the UEFA Champions League last month. He was kept on the bench until half-time against Côte d'Ivoire last Friday in Cabinda by Serb coach Milovan Rajevac to avoid aggravating the injury and his second-half presence on the pitch could not prevent a heavy defeat.
Rajevac suggested the lopsided scoreline against Côte d'Ivoire did not do his side justice. "We didn't play as badly as the score suggests. Most of the time we played well but unfortunately we didn't get the breaks."
After Essien's training setback it looks as though lady luck has yet to smile on the first team from Africa to qualify for the 2010 FIFA World Cup™. Burkina Faso set out a defensive stall against Côte d'Ivoire and the ploy worked a treat as European-based stars like Didier Drogba and Kolo Toure were held at bay.
Burkina Faso coach Paulo Duarte said: "That goalless drew has allowed us to start thinking of qualifying for the last eight. Now we have to take on another World Cup qualifier in Ghana, but my team has the ability to put up a good performance."