The leaders of the BKT United Rugby Championship had little trouble maintaining their 100% record at The RDS on Saturday evening.

Luke McGrath’s double alongside singles from Max Deegan, Brian Deeny, Max O’Reilly and Liam Turner pushed Leinster to another bonus-point victory.  

The home side settled into a familiar pattern, keeping the ball in hand until the time was right for Harry Byrne to kick the ball away where Rhys Priestland was ready to cope.

When Byrne arrowed a kick to within five metres, Cardiff’s throw was crooked and Deegan shot off the back of a solid scrum to go close.    

Coming back advantage at the scrum, a tap penalty was used perfectly by Scott Penny, enabling Deegan to make the line in the eighth minute. 

A skyscraping kick by Jarrod Evans delivered a scrum that Lloyd Williams used to put Owen Lane close to a breakthrough.

A surge by Deegan up the left and a deft blind pass by McGrath initiated a move that drew a penalty which Leinster used to engineer a try by McGrath for Byrne to convert in the 21st minute. 

A synchronised maul defence forced Cardiff into touch and McGrath’s boot took Leinster away from the danger zone.   

Harry Byrne’s burst brought play over halfway and the out-half followed it with a diamond of a punt to within five metres. 

They peppered Cardiff with multiple runners and McGrath used a variety of options to dupe the defence for the third try, converted by Byrne for 19-0 on the half-hour. 

The home boys were quick to expose holes on the fringes of the ruck to break the gain line which Cardiff just about survived to half-time.  

A muscular break and exquisite offload by Ben Brownlee allied to a careering carry by Liam Turner took Leinster forward.

Jason Harries slap down of a pass resulted in a yellow card, prompting a lineout-into-maul which ended with lock Deeny grabbing the bonus-point try for Byrne’s conversion in the 49th minute.

The Irish Blues softened up the defence with Max Deegan, Penny and John McKee coming onto the short ball at speed before spreading the ball right for wing O’Reilly to squeeze over on the right.

Cardiff’s best period of play led to a sustained attack, churning out 22 phases for Leinster to bend without breaking.

In fact, they came forward in waves to turn the visitors away with aggression in defence, keen to keep a clean sheet. 

 Last year’s Ireland U20 number eight James Culhane was introduced for his debut just as James Botham cracked the cover and Rory Thornton crashed over for Evans to convert for 31-7 in the 68th minute. 

Another ex-Ireland U20 Aitzol King made his debut as Cardiff came again, Nick McCarthy forcing a knock-on out of Ellis Bevan in the shadow of the posts.

However, Matthew Morgan’s nimble fingers were the spark behind a collective thrust, ending in replacement Kristian Dacey’s try, converted by Evans.

Just for good measure, Turner seized on a loose ball to claim the sixth try and Charlie Tector knocked over the conversion to end a fine evening’s work.