Ireland played most of the rugby but France hung on to secure their first win in this year's RBS Under-20 6 Nations tonight, with out-half Gilles Bosch kicking them to a 20-15 victory.

Allen Clarke's Irish side tried everything to batter down a beefy French defence, but some poor decisions and a lack of that crucial final pass saw the visitors go without a try.

They lay siege to the French line in the final quarter but the home side, with their scrum growing in stature, rallied to see out a nail-biting win.

Full-back Andrew Conway got closest when he went on the outside and blazed a trail down the left touchline, but the support was slow in getting to him and France won a relieving penalty.

Ireland were unchanged from last weekend's opening 39-0 win over Italy and after a sticky early patch, a pinpoint kick from winger Simon Zebo forced France to concede a lineout, deep in their half.

Hooker Niall Annett, who threw well all night, found his target in the lineout and following a ruck infringement from France number 2 Mickaël Ivaldi, Irish out-half James McKinney landed the penalty from the left for a seventh minute lead.

Patrick Butler, Ben Marshall and team captain Rhys Ruddock got through some good early work as the French tried to hit. All-action flanker Dominic Ryan was as busy as ever, too busy on occasions and an infringement from the Leinster man allowed Bosch level the game - with his penalty effort flicking in off the right post.

Ryan floored Mathieu Lamoulie with a textbook tackle as France tried to force the issue close to the Irish 22. Nonetheless, a botched drop goal from Bosch was quickly followed by a French try from deep.

On 20 minutes, scrum half John Cooney launched a box kick but the chase was poor from his team-mates and the French seized their chance with Julien Fritz and Clément Lagain instigating a swift counter attack that ended with Lamoulie scoring in the right corner.

It was a sucker-punch try as Ireland had settled well. After Bosch's missed conversion, Clarke's youngsters built again and when France were penalised at the breakdown in front of their posts, McKinney fired over his second penalty.

The threatening Irish backs were playing themselves into the game, with some strong running from Darren Huson, Simon Zebo and Nevin Spence bringing play into the hosts' 22.

Props Bryan Cagney and Jack O'Connell also looked to have the measure of their men at scrum time. From a solid set piece and a well-controlled ruck, Ireland drew another penalty which McKinney converted for a 9-8 lead.

It got better for the Irish as McKinney's fourth successful kick, just short of half-time, sent his side in at the break with a 12-8 advantage.

Frustratingly for Clarke and his management team, Ireland endured a flat third quarter during which Bosch booted France ahead at 17-12. The French upped their game in a number of areas, most importantly in the scrum and open play while their maul increasingly became a threat.

Ireland were guilty of trying to run the ball out of their 22, allowing Bosch an early look at the posts and the Perpignan prospect made no mistake.

McKinney took a heavy knock and made way for Brian Kingston who was off target with a long range penalty just seconds after being introduced.

There were knock-ons and poor decision-making by both sides, but France seemed to have the bounce of the ball and two more successful penalties, the second after a huge scrum, left Ireland trailing by five points.

A raid through the middle from centre Spence got Ireland firing again on the hour mark and an excellent penalty from the right from Kingston gave plenty of encouragement.

France turned the screw again up front though, and a Bosch penalty in the 64th minute proved to be the match-winning score.

Ireland continued to look dangerous with ball in hand, but they were kept at arm's length by the hosts for most of the closing minutes.

A little more construction and composure was necessary as the Irish put width on the ball in an attempt to stretch the French defensive wall.

But fired-up France, managed by Philippe Sella, held firm on the two or three occasions that their line was seriously threatened, with a scrum won against the head being the final nail in Ireland's coffin.

Scorers: France: Try: Mathieu Lamoulie; Pens: Gilles Bosch 5

Ireland: Pens: James McKinney 4, Brian Kingston