WALTHAM — If you go by Friday, the Celtics  appeared to be calm, cool, collected and oh yes, confident, on the eve of their sixth Game 7 in the “Big Three” era.
The group of Paul Pierce , Greg Stiemsma  and Ray Allen  and assistant coach Tyronn Lue held a fun competition before Friday’s practice, as all right-handed shooters shot free throws with their left hands. Interestingly, Allen was the first to bow out, as he moved on to the more mundane effort of practicing shooting before the practice began.
The captain knows what’s at stake Saturday night at 8 p.m. as they take on the Sixers in Game 7 of the Eastern semifinals.
“Of course, we’re at home but they’ve beaten us on our home court,” Pierce said, referring to the 82-81 loss in Game 2. “You still have to go out and play the game but I feel good. A couple of days rest for a veteran team, much needed. I like our chances.
“I think we’ll come out with a great sense of urgency. It’s Game 7, there’s no tomorrow. In order for us to advance, we have to give it our all. We have to give it everything we’ve got. We need everything from everybody, whoever steps on that court to understand that this is it, this could be the season. That’s the way we have to play. We have to play like a desperate team, whether we’re at home or not. The team that wants it the most is going to get it.”
Overall, Pierce is 3-3 in Game 7s in his career. He lost his first in 2005 to the Pacers. Then, he won three straight, starting with wins over the Hawks and Cavaliers  in 2008 on the way to his lone NBA title. Pierce led the charge over the Bulls in the first round in seven games in 2009 before falling to the Magic in a seventh game in the next round.
The most painful of all Game 7 losses, however, came the next year as the Celtics had the lead with six minutes left but couldn’t hold on and lost 83-79 to the Lakers in the final game of the 2010 NBA finals . Pierce has thrived in do-or-die games for the most part, including his 43 points in the fifth and deciding game of the 2002 first round series against Philadelphia.
“I like challenges,” Pierce said Friday. “I like being in pressure situations. It’s Game 7. I’ve been there before. I understand what it takes and I’m ready for it.
“It’s got to be a motivated group. What else is there? Game 7, what more could you ask for? If this is not the most important thing to you right now, then there’s no other way to motivate basketball players out here. Nobody wants to end their season right now. We have a great opportunity to advance to the Eastern Conference finals on our home court. That’s all the motivation we need.”