Cape Town - Zambia international Isaac Chansa still believes Chipolopolo have a great opportunity to advance to the quarter-final of the Africa Cup of Nations, despite their failure to beat the DRC in their opening Group B fixture last weekend. Zambia, like the other three teams in the group, have accumulated a single point after the first round of fixtures, but there will be an opportunity to alter their fortunes when they play against Tunisia at the Nuevo Estadio de Ebebiyin on Thursday, and Chansa thinks the objective can be realised."I am wishing the guys all the best in the last two games and we have to win both our last two matches," Chansa told AfricanFootball."The team has obviously reviewed the tapes of Sunday’s game and we have corrected our mistakes in training. I know the coach is working on that," added Chansa."We have to win that game so that we give ourselves a chance to go to the quarterfinal because if we don't win that game, we will put ourselves in a difficult situation and almost 50 per cent out of the tournament."