Chicago eliminated St. Louis in six games during a first-round series in 2014, but the Blues have added high-end skill to their lineup, which makes defending them even tougher.
"They have a number of players who can make plays," Blackhawks coach Joel Quenneville said after practice Tuesday. "They're all nifty and handy with the puck. [They have] good play recognition and patience. That's why they're such a threat in our zone, and we've got to make sure we try to slow down the rush game as well."
In past seasons, the Blues made additions to their lineup through free agency, trades and developing prospects. They signed center Paul Stastny as a high-priced free agent, traded T.J. Oshie to the Washington Capitals to get former Blackhawks forward Troy Brouwer, and developed defensemen Colton Parayko and Joel Edmunson.
The additions mixed well with a core that includes forwards Vladimir Tarasenko, David Backes Alex Steen and Jaden Schwartz, and defensemen Kevin Shattenkirk, Alex Pietrangelo and Jay Bouwmeester. The Blues have gone from a team that looked to inflict a physical toll to one that has quality depth.
"They're a fast team and they can score as well," said Blackhawks center Marcus Kruger, whose fourth line is sure to draw one of the Blues' top forward groups. "I think they've changed a little bit from previous years. They brought in some good free agents there, with a lot of skill, so they're a very skilled team as well as physical."
The Blues won the season series against the Blackhawks 3-2, with three games decided beyond regulation. Chicago took a 5-2 lead in the first game, played at United Center on Nov. 4, but St. Louis won 6-5 on an overtime goal by Tarasenko.
He also won the final meeting of the regular season, 2-1 in overtime at United Center on April 7. Tarasenko tied the game late in the third period and ended it with his 39th goal.