New York Rangers coach Gerard Gallant has defended his call to pull goaltender Igor Shesterkin after the first period as Pittsburgh Penguins ran out to a 7-4 victory in Game 3.

The visitors suffered a playoffs setback at PPG Paints Arena, as their Pennsylvanian hosts moved into a 2-1 lead in the Eastern Conference first-round series.

Shesterkin was hooked after the first period after Pittsburgh raced into a 4-1 lead and was replaced by Alexandar Georgiev.

That helped spark a turnaround for the Rangers, who clawed back three goals in the second period to move back on level terms.

But after Danton Heinen put the Penguins back in front halfway through the third period, Pittsburgh did not relinquish their lead again, with Jake Guentzel and Jeff Carter extending their advantage.

Gallant backed his decision to withdraw Shesterkin, a 2018 Olympic gold medallist, saying that it was to offer the goaltender much-needed rest after a busy schedule and thought it might provide a spark.

"It's 4-1 and you want to change momentum," he stated. "Igor has been outstanding.

"If you look at it right now, he's played 10 periods, more or less, in basically 4 and half, five days. I thought it was a good time to jump-start it.

"It was 4-1. It was totally tilted. Sometimes you spark your team with a goalie change. Igor was our MVP all season.

"I thought we'd give him a little rest tonight and hopefully spark our team. And it worked."

The Rangers will attempt to hit back in Game 4 on Monday.

Pittsburgh Penguins captain Sidney Crosby was quick to back goaltender Louis Domingue, following their 5-2 loss to the New York Rangers on Thursday.

The Rangers tied their playoff series up at 1-1 after Pittsburgh's 4-3 win in triple-overtime at Madison Square Garden on Tuesday.

One of the key figures in that overtime win, Domingue was given a start by Penguins coach Mike Sullivan, but gave up key goals to Ryan Strome and Chris Keider via deflections.

Crosby backed his teammate following the loss, bringing saves he did make with Game 2 in the balance in perspective.

"The fourth was a bad bounce, a couple of tips there," Crosby said. "I thought he [Domingue] was solid. I thought he made some big saves, especially when there was a one or two-goal difference, that kept us in it."

The two-time Hart Memorial Trophy winner believes the Penguins simply need to start better and put three periods of hockey together to progress past the Rangers.

"It's the playoffs," Crosby said. "There are going to be swings of momentum but I thought that in both games, as they've gone on, we've probably gotten better. We just have to find a way to come out of the gates a bit better.

"You don't want to get down two, we've done that a couple of times now. It's not something we want to make a habit of.

"We get that late one and we had some really good chances early in the third and didn't convert, and they got a bounce. That's what it came down to."

In other NHL playoff results on Thursday, a Cale Makar goal gave the Colorado Avalanche a 2-1 overtime win over the Nashville Predators, moving to 2-0 in their series.

Meanwhile, the Dallas Stars and Florida Panthers tied up respective series with the Calgary Flames and Washington Capitals.

Evgeni Malkin says the Pittsburgh Penguins "deserved to win" after he scored the decisive goal 5:58 into the third overtime of their 4-3 victory over the New York Rangers in the NHL playoffs on Tuesday.

The Penguins take a 1-0 lead in their Stanley Cup playoff opening-round series, where goalies Igor Shesterkin and Louis Domingue were outstanding for both sides.

Penguins back-up goalie Domingue came in for Casey DeSmith who exited due to cramping. Domingue starred with 14 saves in the second overtime and three more in the third.

"We know we can win every game if we play right," Malkin told reporters. "We play smart. We play hard. I think we deserved to win tonight."

The Rangers had led 2-0 after Andrew Copp doubled their lead in the second lead after Adam Fox's power-play goal in the first period.

The Penguins leveled it up after goals from Jake Guentzel in the second period, before Chris Kreider restored the Rangers' lead. Malkin found Bryan Rust to square the game up again, before it headed for overtime. Malkin came up with the decisive deflection.

The epic was the longest-ever NHL game played at Madison Square Garden.

On Domingue, Malkin added: "For me, I know Louis is unbelievable. He is big and he is fast. I wasn’t worried. It is hard to score on him in practice."

Washington Capitals forward Tom Wilson was injured as his side won 4-2 over the Florida Panthers in Game 1 of their series. Wilson had scored before going off with a lower-body injury.

Colorado Avalanche piled on five first-period goals as they routed the Nashville Predators 7-2 in Game 1 of their first-round playoff series.

Elias Lindholm's first-period goal proved the difference as the Calgary Flames got past the Dallas Stars 1-0.

Ryan Reaves has no doubt that the New York Rangers are worthy of their place among the NHL's elite teams.

The Rangers moved to 26-10-4 for the season with a 6-3 victory over the Toronto Maple Leafs at Madison Square Garden on Wednesday.

They top the Metropolitan Division and sit third in the overall Eastern Conference standings on 56 points, behind the Tampa Bay Lightning and Florida Panthers.

Reaves, who turned 35 on Thursday, scored the first two goals of his Rangers career in the win over Toronto, doubling his tally from last season with the Vegas Golden Knights.

When asked if Rangers had to now be considered as one of the best teams in the NHL, Reaves told reporters: "I think we know it. I think maybe some of the league doesn't believe it, but let them keep [not] believing it.

"We're gonna keep doing our thing and, I mean, the standings don't lie."

The Rangers have not won a division title since 2014-15, while their last Conference Championship came a year before that. The most recent of their four Stanley Cup triumphs, meanwhile, was achieved in the 1993-94 season.

Next up for the Rangers is a huge, top-of-the-standings contest against the Carolina Hurricanes, who sit just behind New York in the Metropolitan Division.

"It shows that we can hang with the big boys, that we are one of the big boys," a bullish Reaves continued.

"We've got to keep beating the playoff teams. That's something we've talked about, but I think we're proving to the league that we're a contender."

The Ottawa Senators' next three NHL games have been postponed due to a coronavirus outbreak.

Ten Senators players and associate coach Jack Capuano are in NHL COVID-19 protocol following positive tests over the past 10 days.

Drake Batherson, Austin Watson, Alex Formenton, Dylan Gambrell and Connor Brown missed the 4-0 defeat to the Calgary Flames on Sunday, with Nick Holden, Victor Mete, Nikita Zaitsev, Josh Brown and Matt Murray also absent.

Ottawa's training facilities have been closed until further notice, and they will not face the New Jersey Devils on Tuesday or the Nashville Predators on Thursday.

Saturday's game against the New York Rangers has also been called off on Monday, with the league citing "evidence of continued spread in recent days."

They are the first games postponed this season due to concerns over the virus, with 55 having been postponed last season.

The NHL stated that rescheduled dates for the three games are to be determined.

New York Rangers great Henrik Lundqvist retired from the NHL after a stellar 15-year career in the league.

A five-time All-Star and Vezina Trophy recipient as the NHL's top goaltender in 2011-12, Lundqvist made the announcement on Friday.

Lundqvist signed a one-year deal with the Washington Capitals for the 2020-21 season, but the 39-year-old never made an appearance after undergoing open-heart surgery in January.

The Swede finished his NHL career with a 459-310-96 record, a 2.43 goals-against average, .918 save percentage and 64 shutouts in 15 seasons with the Rangers, while he went 61-67 with a 2.30 GAA, .921 save percentage and 10 shutouts in 130 Stanley Cup playoff games.

Lundqvist ranks sixth in NHL history in wins, seventh in saves (23,509), eighth in games played (887), ninth in starts (871), ninth in time on ice (51,816:51) and 17th in shutouts.

"Obviously there are a lot of emotions right now," Lundqvist said at a news conference in Sweden. "For me, it started here in Scandinavium when I was five years old I saw my first hockey game here. That's how it started.

"I also want to thank all the coaches and all the players that I've had the opportunity to play with and I want to thank all the clubs that I've represented. Jarpen, where it all starter, Rogle BK, Frolunda of course, and the New York Rangers. All of them have meant so much to me during that time and place. A big part of my life has been dedicated to those teams.

"At last I want to thank all the fans. I've felt so much support here at home playing for Frolunda and the national team, and in New York. It's been giving me so much joy to feel that support. I will be forever grateful for it. ... That is obviously something that I will miss, the intense feeling of being in a rink competing."

Initially drafted in 2000, Lundqvist enjoyed an outstanding rookie season in 2005-06, ranking fourth for save percentage (92.2 per cent) and fifth-lowest for goals against average (2.24). 

The 2011-12 campaign brought Vezina Trophy recognition as he kept eight shutouts in 62 games, again ranking fourth for save percentage (93.0 per cent) and fifth-lowest for goals against average (1.97). 

Lundqvist did enjoy success at international level with Sweden as he claimed a gold medal at the 2006 Winter Olympics and the 2017 Ice Hockey World Championships.

He is the Rangers' leader in wins, shutouts, games played, starts, saves, time on ice and goalie points (27, all assists). Lundqvist is also New York's postseason leader in wins, shutouts, games played, games started, saves and time on ice.

"It is with mixed emotions that The New York Rangers offer our best wishes and heartfelt gratitude to Henrik Lundqvist on the announcement of his retirement," the Rangers said in a statement. "Henrik's commitment to excellence made him one of the best goaltenders to ever play the game of hockey, and we are so fortunate to have witnessed his greatness firsthand for 15 years.

"As we congratulate Henrik on an extraordinary career and a lasting legacy of success, charity and character, we are honoured to announce that we will retire his number and raise his jersey to the rafters at an upcoming game this season. Henrik is, and always will be, a Ranger."

Like everything else over the past year, the hockey world has been turned upside down by the coronavirus pandemic. The 2019-20 season was completed with teams playing in bubble locations in Toronto and Edmonton and the 2020 campaign will open without fans as part of a condensed 56-game season, among a slew of other changes. 

With the previous season extending several months past the normal ending date, the league had little choice but to delay the start of 2021 and to find a way to make a shortened season work. The new plan is for the regular season to end on May 8, with the Stanley Cup awarded no later than July 9. 

Of course, nothing is set in stone anymore and the NBA and NFL have had to deal with countless COVID-19 issues, so the NHL expects similar problems to arise with the pandemic experiencing another surge. The league knows it may have to adapt and games will very likely need to be rescheduled. 

The NHL has already dealt with this, as the start of the season for the Dallas Stars had to be pushed back to January 19 after six players and two staffers tested positive for coronavirus. While the completion of last season in the bubble locations was virtually flawless, teams are playing in home arenas this season, increasing the chances of players becoming infected. 

To combat this, teams will be allowed to carry taxi squads of four to six extra players who will practice and be prepared to step in when needed. 

While there is less hockey to enjoy, there are some tweaks to the upcoming season that fans will enjoy. 

The four divisions have been realigned and they include an all-Canada division of seven teams, made necessary by border restrictions. The other three divisions are mostly based on geography, but St Louis and Minnesota were shuffled into a division with the three California teams, Vegas, Arizona and Colorado. 

The Chicago-Detroit rivalry gets renewed with the Red Wings moving into the Central Division, and Tampa Bay and Dallas – last season's Stanley Cup Final participants – are now together in the Central.  

There should be no shortage of intensity this season with teams scheduled to play mostly back-to-back sets solely against teams in their own division. So, the Flyers and Penguins will meet eight times, as will the Islanders and Rangers and Kings and Ducks. The teams in the all-Canada division will face each other nine or 10 times.  

The first two playoff rounds will be played within the division, meaning the bad blood that started in the regular season could grow even deeper. The division winners will then advance to the semifinals but seeding will be based on points rather than geography.  

The new setup raises the possibility of a Stanley Cup Final between traditional East teams like the Capitals and Penguins or Canadian rivals Montreal and Toronto.   

To recoup some of the money lost by having no fans or limited fans at the start of the season in some cities, the NHL is allowing teams to include a sponsor name on their helmets and each division will also include the name of a corporate sponsor. 

The condensed season was preceded by an abbreviated training camp without exhibition games and there is concern that the start of the season will be marred by sloppy play. This could be especially true for the seven teams that have not played a game since March after they did not qualify for the expanded playoffs.  

As in any offseason, several big-name players changed teams. It will be jarring to see 43-year-old Zdeno Chara in a Capitals uniform and Joe Thornton playing for the Maple Leafs after 14 seasons in San Jose. Henrik Lundqvist would have looked strange as a member of the Capitals following an 887-game run with the Rangers, but he decided not to play this season due to a heart condition. 

Injuries will also keep some marquee players off the ice for a while. Lightning forward Nikita Kucherov – the 2018-19 scoring leader – will miss the entire regular season due to hip surgery and the Stars could be without top forward Tyler Sequin (hip) and goaltender Ben Bishop (knee) until at least March.  

Blackhawks captain Jonathan Toews is out indefinitely with an unknown illness and there is no word on whether the 12-time 20-goal scorer will play this season. 

While this season is full of unknowns and will be like no other before it, the potential is there for it to be one of the most exciting in recent memory.