Defender Bobby Boswell scored on a header in the 83rd minute in the Dynamo’s 1-1 tie with the Chicago Fire on Saturday night at Toyota Park. One of a half-dozen Dynamo players crowding the penalty area, Boswell headed Brad Davis’ corner kick low to the left of goalkeeper Jon Conway. The Dynamo (2-1-3) are unbeaten in their past five Major League Soccer matches. Chicago is 1-3-2. Read more: http://www.chron.com/disp/story.mpl/sports/soc/7534728.html