The Bengals opened the regular season on the road against the Kansas City Chiefs on September 10.  The Chiefs scored first on a 29-yard field goal by kicker Lawrence Tynes.  In the second quarter, the Bengals scored 17-straight points.  Bengal kicker Shayne Graham tied the game up with a 37-yard field goal, Rudi Johnson ran 22 yards for a touchdown, and Kenny Watson ran 8 yards for another touchdown, making the score 17-3 at halftime.  After both sides failed to score in the third quarter,  which was marked by Chief quarterback Trent Green being injured and leaving the game, Graham made the score 20-3 with a 42-yard field goal.  A Chiefs' come back fell short, as they could only score on a 9-yard touchdown pass from Chief back-up quarterback Damon Huard to tight end Tony Gonzalez.  A 36-yard field goal by Graham would be the final score of the game, leaving the Bengals 1-0.. How many points was the Bengals ahead of the Chiefs by halftime?