Two star names four days apart in the Nations League and neither could find a way to unlock the Northern Ireland defence.

In Tbilisi last week, Khvicha Kvaratskhelia and Georgia were frustrated by a player of the match performance from visiting goalkeeper Pierce Charles that featured saving a penalty from the Ballon d'Or nominee in a 1-0 win.

Against Dominik Szoboszlai and Hungary back in Belfast on Monday, Charles barely had a save to make with the visitor's first shot on target coming in the 90th minute of the 0-0 draw.

Having returned to the second tier of the Uefa Nations League after successive campaigns in League C, the most impressive aspect of Northern Ireland's first 180 minutes back at this level has undoubtedly been their defensive solidity.

Indeed, Hungary became the eighth opposition team to fail to score at Windsor Park in the past 10 games with only Germany and Switzerland bucking the trend.

"There's a lot for us to be positive about," said manager Michael O'Neill

"It's two clean sheets in the group, eight clean sheets out of ten games [in Belfast].

"I am proud of how they played tonight, they couldn't have given us any more."

While O'Neill spoke of a "snobbery" about the way his team play in his post-match interview with BBC Sport NI, his fingerprints were again all over Monday's performance given his focus on shape, organisation and hard work off the ball.

The clean sheet was all the more impressive given the absence of Daniel Ballard.

The Sunderland defender picked up a hamstring injury in Tbilisi and has been ruled out for the remainder of the window. He was replaced by Ruairi McConville against Hungary and the Norwich man performed well in the back-three alongside Ciaron Brown and Tom Atcheson.

Oxford United's Brown was perhaps a surprise starter for some in Tbilisi but more than justified his selection against Georgia before he backed it up against Hungary.

"Ciaron has been terrific now for quite some time, really, to be honest," said O'Neill.

"Ciaron is very reliable. He's playing his club football at the moment in League One, he's a better player than that.

"He's left-sided. He's competitive. He has a long throw. He has a lot of attributes that, for me, means he should be playing at a higher level than the club level he's playing."

With Hull City's Paddy McNair yet to start in this four-game window, and Trai Hume and Brodie Spencer other options to play at centre-back, defensive depth has become a real strength of this side.

If the options are as strong as at any time since Jonny Evans, Gareth McAuley, Aaron Hughes and Craig Cathcart were Premier League regulars a decade ago, it is a different story in attacking positions.

At the other end of the pitch, things remain a work in progress.

Northern Ireland were the markedly better team in the first half against Hungary, although after a 5,000-mile round trip to Tbilisi appeared to tire as the game worn on.

Again, however, they struggled to create chances throughout. According to Opta, their xG on Monday night was just 0.55, their lowest in a Nations League game since September 2022.

The side's record goalscorer David Healy pointed to the side's lack of threat from set-pieces with Balazs Toth easily gathering a few corners. The presence of Ballard in the opposing box was missed too.

"The set pieces were really poor," said Healy on BBC NI's coverage.

"We pride ourselves in them but we did not threat at all. Hungary did not really have many chances. Overall, coming away with a clean sheet against the opposition, O'Neill will be pleased.

"The frustration will be if we had been bang at it, it was an opportunity."

Jamie Donley, who is on loan at Luton Town from Tottenham Hotspur, again led the line but did not have much in the way of opportunities.

Isaac Price and Patrick Kelly started in behind the striker, with the latter hitting the bar in the first half, but were backed up by a trio of promising yet untried teenagers, none of whom were brought on in a second half when Hungary wrestled back control.

"When we look at the top end of the pitch, we're looking at much younger players," said O'Neill.

"Kieran Morrison, Ceadach O'Neill, Braiden Graham - we don't have the same options in terms of what we can do at the top end of the pitch, in terms of experience, and being a little bit more accustomed to international football and first-team football."

It should be remembered that O'Neill is still without Conor Bradley who has missed the past six games through the serious knee injury he sustained with Liverpool in January.

For all the talk of how to stop Kvaratskhelia and Szoboszlai over recent weeks, opposition have not had to give any thought as to how to account for Northern Ireland's own talisman.

Even allowing for the small and spread sample sizes afforded by international football, Northern Ireland have scored 24 times in Bradley's past 16 caps. In the nine games played without him during that span, they have found the net on just six occasions.

With the 23-year-old expected to miss the rest of this Nations League campaign, the Hungarian stalemate again showed that replacing his attacking impetus remains O'Neill's biggest short-term challenge.

Again, though, his side showed against Hungary that their defensive solidity is a platform to build upon.