Task: Question Answering
Input (English): Passage: The Eagles kicked off the 2017 season on the road against the Redskins. The Eagles started off with two TD passes from Carson Wentz to give them a 13-0 lead. (Kicker Caleb Sturgis missed an extra point after the 2nd TD.) However, the Redskins came back with a Ryan Kerrigan pick six and a TD pass from Kirk Cousins to RB Chris Thompson to give them a 14-13 lead late in second quarter. The Eagles responded with a field goal to give them a 16-14 lead at the half. The third quarter only consisted of field goals. The Eagles led 22-17 at the end of the third quarter. In the fourth quarter, Kirk Cousins fumbled the ball which Eagles' DE Fletcher Cox recovered for a TD to seal an Eagles victory. This was the Eagles first win against the Redskins since September 2014, ending a five-game losing streak to their division rival. With the win, the Eagles started 1-0 for the sixth time in their last seven season openers. 
Question: By how many points were the Eagles ahead at the half? 
Answer type: Number 
Output (English): 2.