Flat out, Craig Anderson holds the key to the Senators' success. If he can match or outperform Rangers goalie Henrik Lundqvist, they have a decent chance of extending their surprising season. But two other factors also loom large for Ottawa in an opening-round playoff series that starts Thursday night at Madison Square Garden. A) Can the team's hot and cold offence stay at least lukewarm? B) Can the young and inexperienced Senators avoid making detrimental mistakes?