PITTSBURGH — Matthew Schaefer showed quickly he could impact an NHL game as the No. 1 overall pick’s speed and poise helped the Islanders play a noticeably faster game than they could last season. The 18-year-old defenseman needed a little more than a half of a period to record his first point and coach Patrick Roy trusted him enough to put him on the ice for a lengthy shift in the final minute of regulation with the team skating six-on-five as it sought the equalizing goal.

“It’s amazing,” Jean-Gabriel Pageau said. “We got a little taste of it during training camp and all the hype videos we saw. But he’s so composed with the puck and he knows when to jump, when not to jump. His hockey IQ is amazing. He played great tonight for us.”

“He was throwing pucks at the net,” Roy said. “He se

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