A three-goal second period propels the Islanders to a series-deciding victory in Game 6 of the East Division finals.

Penalty calls made, and not made, and the ensuing results are tipping the competitive balance of the postseason.

Coach Bruce Cassidy was not pleased Monday with the penalty calls in Boston’s 5-4 loss to the Islanders, which put the Bruins down 3-2 in the best-of-seven series.

Semyon Varlamov stops 40 shots and New York hangs on to take a 3-2 series lead over Boston.

David Pastrnak hit the post while shooting on a wide-open net, and the Islanders took advantage to tie the series with a 4-1 win.

Matthew Barzal breaks a tie with 6:57 remaining and the Islanders add two empty-net goals to tie the series at two games apiece.

Carlo suffered a head injury in Boston’s 2-1 overtime in over New York on Thursday.

Boston regains the upper hand in the East Division finals with a 2-1 victory.

Boston forward Craig left Game 1 and missed Game 2 with a lower-body injury, but is back at practice and could be ready to play Thursday.

Boston defenseman Jeremy Lauzon was a part of three big plays in Monday’s 4-3 overtime loss to the Islanders, including one he’d like to forget.