Tomas Kopecky and Jonathan Toews each had a goal and and assist, and the Blackhawks beat the St. Louis Blues 4-3 on Sunday in the preseason finale for both teams.Troy Brouwer and Marian Hossa also scored for the Hawks (3-4-0). The Blackhawks open the regular season Thursday in Colorado.B.J. Crombeen, T.J. Hensick and Patrik Berglund scored for the Blues (5-3-0), who open at home against Philadelphia on Saturday. Ty Conklin stopped 20 shots.Marty Turco, who will start the season as the new No. 1 goalie, stopped 20 shots. One of the NHL’s most-active puckhandling goalies, Turco helped set up Toews’ goal with a long pass, but also enabled Hensick’s with a giveaway.The Blackhawks lineup included nearly all of their regulars. he Hawks had 25 players on their roster Sunday; NHL teams must trim down to 23 this week.Blackhawks defenseman Brian Campbell, who suffered a right knee sprain against Pittsburgh on Friday, didn’t skate on Sunday and will miss four to five weeks. Niklas Hjalmarsson, Campbell’s defense partner for most of last season, was paired with 19-year-old rookie Nick Leddy.St. Louis coach Davis Payne used a lineup of mostly younger players. Sitting out were several top returning Blues players, including Andy McDonald, Brad Boyes, T.J. Oshie, David Backes and Erik Johnson.After a scoreless first period, the Blackhawks opened a 4-1 lead in the second, scoring their first three goals on consecutive shots.Kopecky’s power-play goal score, a deflection of Duncan Keith’s shot from the point opened the scoring at 8:43 of the second. Brouwer made it 2-0 just over 3 minutes later when he connected from the front of the net after Jake Dowell forced a Blues turnover.Hossa deflected in a shot by rookie Jeremy Morin for a power-play goal with 6:55 left in the period. Crombeen cut it to 3-1 with 3:02 to go in the second by lofting in a rebound.Toews replied 38 seconds later, completing a rush that was set up by Turco’s long pass from near his own crease to center ice.Turco’s giveaway set up Hensick’s goal at 1:51 of the third that cut it to 4-2. Behind the net, the goalie dished the puck right on to the stick of Brad Winchester, who fed Hensick in front of the goal.Berglund completed the scoring with 2:09 left.