PITTSBURGH — The Penguins have scarcely made an attempt at playing playoff-style hockey this season. As a result, they’re no sure thing to make the postseason. For one night, at least, they showed they were capable of it. The Penguins played a far smarter brand of hockey on Thursday against Nashville. Along the way, they received a stellar performance from Tristan Jarry and earned a much-needed 2-0 victory. Advertisement Jason Zucker and Jake Guentzel scored for the Penguins, who are one point ahead of the Florida Panthers for the final playoff spot in the Eastern Conference. Florida won in Montreal…