Michael Schumacher is not writing off the Formula One championship but concedes his Mercedes car is less competitive than others on the grid. The seven-time world champion says a podium position at the Malaysian Grand Prix on Sunday "probably is the maximum we can look for at the moment." He says the Mercedes is having difficulty following other cars closely - and overtaking is "almost impossible unless someone makes a mistake." Schumacher insisted Wednesday that he was "quite happy I've made the maximum out of my possibilities. We still can fight for the championship." He says the car will be upgraded by the Barcelona race in early May. Schumacher currently has nine points from two races.