Anderson turned aside all 15 shots he saw in the final period, registering his second straight strong performance as the Senators grabbed a 3-games-to-2 lead in their Eastern Conference quarterfinal series.
Jason Spezza, who hadn't dented the net in the series, scored midway through the first period and added an empty-netter for the Sens, who have stormed back from a 2-games-to-1 deficit to put the top-seeded Rangers on the brink of elimination.
Henrik Lundqvist made 28 saves for New York, which will try to stay alive in Monday's Game 6 in Ottawa.
Exploding whale video goes viral on Internet
Texas principal bans speaking Spanish, stirs controversy