PITTSBURGH (AP) — Buddy Robinson and Andres Athanasiou scored 26 seconds apart in the third period and the Chicago Blackhawks dealt the Pittsburgh Penguins’ playoff chances a significant blow in a 5-2 win. Pittsburgh began the night needing wins in its last two games over Chicago and Columbus to extend the longest active playoff streak in major North American professional sports to 17. Instead, Petr Mrazek made 38 saves for the Blackhawks to stun the Penguins in their home finale. Florida clinched a playoff spot with Pittsburgh’s loss.