DALLAS — Patrick Sharp scored twice, extending his domination of the Dallas Stars, and the Chicago Blackhawks cruised to a 6-2 victory Tuesday night.Brandon Saad also scored two goals for Chicago, which has won three of the four games between the teams. One victory was in a shootout.Sharp has four goals and four assists against the Stars this season. In his last eight games versus Dallas, he has eight goals and seven assists.For the Stars (14-10-5), Antoine Roussel scored a second-period goal to end Chicago goalie Antti Raanta’s shutout bid. Roussel was credited with another goal when he deflected Sergei Gonchar’s drive into the net with 19 seconds remaining in the game.Dan Ellis replaced Stars starter Kari Lehtonen after he gave up four goals in the first 28:20. Dallas has given up six goals in three different losses this season.The Stars’ power-play woes continued. They failed to score on their five power plays, dropping their home success rate to 1-for-47 (2 percent).Patrick Kane had a goal and two assists for the Blackhawks. Defenseman Michael Kostka returned after missing 24 games because of a foot injury to score Chicago’s first goal.The Central Division-leading Blackhawks (22-6-5) reached six goals for the fifth time this season and for the second game in a row. They defeated Florida 6-2 on Sunday.