Wales ultimately lost 27-17 at the Aviva Stadium, as Ireland kept alive their slim hopes of claiming the Six Nations title and Wales inched closer to another wooden spoon after a 15th successive defeat in the tournament.
But the scoreline told only part of the story, with Wales pushing their hosts hard and leaving the home crowd anxious for long stretches of a bruising contest.
For Tandy, the match represented perhaps the clearest evidence yet that his developing side are beginning to find their feet.
“I’ve massive pride in the boys and the shift they put in,” said the Wales head coach.
“The physicality they left out on the field was outstanding.
“We’re disappointed we didn’t get something from the game for the group because I felt we deserved something by the fight they showed, a lot of great skill out there as well.
“This group, they’re unbelievable to work with, they’re always learning, they’re growing.
“I know it’s tough for people, everyone want us to win, but I think the way the group are developing and then when you think about the start we had in England and where we’ve come to, this performance tells you so much about the group.”
That sense of progress was evident in a match where Wales matched Ireland physically and defensively for long spells, forcing the hosts to work relentlessly to secure the bonus-point victory that keeps them mathematically in the title race.
Yet in the end, Wales conceded four tries and that’s always an unlikely basis on which to build a victory, especially with an attack that lacks the fluency to create sufficient try-scoring opportunities.
Ireland had made a flying start when tries from Jacob Stockdale and Jack Crowley put them in control early in the first half.
But Wales refused to fade and responded with one of the moments of the tournament when prop Rhys Carre produced a remarkable solo effort, sprinting clear down the blindside to score.
Carre’s try not only dragged Wales back into the contest but underlined his remarkable resurgence since returning to the international fold under Tandy.
It also highlighted the neglect of Warren Gatland in banishing such a natural rugby talent simply because Carre did not fit into the body shape the former coach demanded.
“He's been a massive credit and all the plaudits should go to Rhys,” said Tandy.
“The way he has come back into the environment and the way he trains as well has been impressive.
“You see the output Rhys has in scoring tries, but there is also the effort he puts in in training.
“I think there's a bigger ceiling in Rhys. He is playing well at the minute, but I believe there's much more to come, which is exciting.”
The scoreline remained tight at the break, with Wales trailing only 12-10 after Carre’s burst to the line, and the visitors continued to challenge Ireland’s defensive organisation with their physicality and defensive discipline.
The Welsh defence produced a huge effort, completing 240 tackles across the match.
Flanker Alex Mann led the way with more than 30 tackles, while lock Dafydd Jenkins and flanker James Botham each contributed more than 20. Captain Dewi Lake also crossed the 20-tackle mark despite playing less than an hour.
The defensive resilience was particularly notable given the changes being introduced behind the scenes.
“The physicality they left out in the field was outstanding,” said Tandy. “Dan [Lydiate] has done a great job around the contact area.
“When we came in in the autumn, there were lots of new systems coming in, lots of different language and the way they've adapted and developed has been great.
“The mindset of the group has been excellent, but as much as you'll see a lot of toughness, there was a lot of skill around the defence as well.”
Ireland eventually stretched their lead early in the second half when No.8 Jack Conan powered over for a try, yet Wales refused to allow the game to drift away.
Their persistence was rewarded when Botham crashed over near the posts to narrow the gap once again.
For long periods the home side were forced into relentless attacking phases as Wales scrambled, tackled and competed ferociously to stay within touching distance.
“It was a proper Test match,” Conan admitted afterwards. “The intensity was unbelievably high throughout.
“We probably gave them easy access a few times but I think we did well to stick in there.
“Yeah, maybe it wasn’t as controlled as you would have liked in various stages but I think that’s a credit to them. They played really well, and brought an unbelievably high intensity to it.”
Ireland eventually secured the win when a sweeping move ended with Jamie Osborne crossing the line, although Crowley’s missed conversion briefly kept Wales within striking distance before the fly-half sealed the victory with a late penalty.
Yet while the defeat extended Wales’ difficult run in the competition, Tandy left Dublin convinced his players' efforts were laying the groundwork for better results.
“Time [together] with this group is massive. We’ve worked a lot on the little bits of our game, and I think over the past two weeks there’s been a massive difference in that. Look, we came out and gave everything tonight – unfortunately, we’re just shy of the win.
“But I think there’s so many positives to take from that game for us. From where we were in round one to where we are now, there’s a stark difference. I think we’ve really given ourselves a platform to build on.”
Wales will now turn their attention to a final-round meeting with Italy in Cardiff, determined to avoid finishing bottom of the table for the third consecutive year.
Lake believes the improvements shown over recent weeks will soon translate into results.
"The win is coming, I can feel it, it is just around the corner," said the captain.
"The development of the team in the past four weeks has been monumental.”
