The mantra has been in place for the past three games: keep it simple, work for everything, crash the net, score any way you can on one end, give up as little as possible at the other. The Chicago Blackhawks knew the formula necessary to win despite missing several key players. On Sunday, they implemented that plan for another successful outing. Patrick Sharp scored his 33rd goal of the season and Jeremy Morin had a goal and an assist as the Chicago Blackhawks beat the St. Louis Blues 4-2 at the United Center on Sunday afternoon. The Blackhawks have won three in a row and are now just one point behind the Colorado Avalanche for the No. 2 seed in the division. That could change, however before Sunday ends; the Avalanche host the Pittsburgh Penguins later tonight. Marcus Kruger and Ben Smith also scored for the injury-depleted Blackhawks, who were without Jonathan Toews (left arm), Patrick Kane (left knee) and Johnny Oduya (lower body). They were also minus Brandon Saad, who was a healthy scratch. Coach Joel Quenneville called the scratch a coach’s decision, and that Saad will likely play again Wednesday when the Blackhawks host the Montreal Canadiens.