Greg Cochrane reached a loose ball in the box to the left of Houston goalkeeper Joe Willis and put it out front. Nyarko, a halftime sub, and Willis arrived simultaneously. Both players hit the deck as the ball bounced free, but Nyarko hopped up and knocked the ball into a wide-open net for his first goal since May 10, 2014.
Alex had given Houston the lead in the 56th minute, three minutes after subbing into the game, when he tapped in a cross from Brad Davis. Alex started the season with Chicago and made one appearance before being traded to Houston on April 13. He didn't play for the Dynamo until June 20 and was appearing in just his third game.
Chicago (4-9-3) is still last in the Eastern Conference with 15 points, while Houston (5-7-6) is ninth in the West with 21 points.