Beat Chennai Super Kings and end up with 16 points to secure a 2nd/3rd place on the point-table.
If in the earlier match, Kolkata Knight Riders beat Rajasthan Royals, and Kings XI Punjab lose this match, Kings XI will still stand at par (14 points) with the losing side of the match between Deccan Chargers and Royal Challengers Bangalore. But in that case, the losing team would know in advance what they need to do to keep their run rate better than Kings XI Punjab.
Bottom-line: Beat Chennai Super Kings and secure the semifinal ticket!