Jessica Rinaldi/reuters

Kevin Garnett hit a jumper with 31 seconds to play on the way to the win Thursday night.

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The Hawks threatened late but the Celtics finished them off to advance to the Eastern Conference semifinals.

Jim Davis/globe staff

Paul Pierce celebrated with fans after the Celtics' Game 6 victory Thursday night.

Jessica Rinaldi/reuters

The Hawks' Josh Smith had 19 points and nine rebounds in the loss.

Jim Davis/globe staff

Rajon Rondo (left) and Paul Pierce slapped hands after a play in the second quarter.

Charles Krupa/associated press

Josh Smith of the Hawks leapt and towered over Rajon Rondo after the Celtics guard faked a shot in the second quarter.

Jessica Rinaldi/reuters

The Hawks' Al Horford fought for the ball with Avery Bradley.

Jim Davis/globe staff

Paul Pierce drove past the Hawks' Josh Smith during the first quarter.

Charles Krupa/associated press

Ray Allen lost control of the ball as he was pressured by Kirk Hinrich (left) and Josh Smith.