Kansas City Chiefs quarterback Patrick Mahomes passed Hall of Famer Len Dawson as the team’s all-time leader in passing yards during the first half of Kansas City’s regular-season opener against the visiting Baltimore Ravens on Thursday.Mahomes needed just 84 yards to eclipse Dawson — who finished with 28,507 yards while with the Chiefs — and did so in the second quarter when he found tight end Travis Kelce for a 23-yard pass.Dawson, a seven-time Pro Bowl quarterback, played 14 of his 19 seasons in the NFL with the Chiefs franchise (including one season with the Dallas Texans, who moved to Kansas City and became the Chiefs in 1963). He was selected to the Pro Football Hall of Fame in 1987.