Blackrock College 43 Clongowes Wood College 15
Blackrock were as good as advertised in making the Leinster Junior Cup semi-final on Thursday.
The pre-competition favourites settled into it when a penalty was reversed for Oliver Coffey to kick a penalty.
A surge by Clongowes second row Alex Kelly and the offloading intention of hooker Kosi Ugwuero were promising moments that came to nothing.
Then, 'Rock right-wing David Doyle beat two defenders from halfway in a clinical demonstration of taking their chances, scrum-half Coffey converting from the left touchline for 10-0 in as many minutes.
The second try was all about the sharpness of out-half Harry Whelan's acceleration through a hole and a surgical pass for the finishing speed of left-wing Daniel Bennett to do the rest, Coffey adding two more points.
Not for the first time, Clongowes looked for ground through the maul, a real weapon, and number eight Dan Daly got over without getting the ball down.
They were still in position until 'Rock centre Eoghan Walsh forced a penalty on the heels of an aggressive counter ruck.
Still, Clongowes had a number of low-to-the-ground carriers, like captain James Wyse and flanker George Strickland, who applied the pressure that yielded three points from wing Ryan Thompson.
They couldn't take it to the break as 'Rock centre Walsh cut through for the third, Coffey's conversion making it a 21-point gap.
It was a knife-through-butter for the fourth as Blackrock got on a roll, Tom Brigg and Theo Byrnes linking to put prop Greg Barron over for another seven.
Then, Whelan's handling and Luke Kritzinger's take-and-give allowed James O'Sullivan to hit top gear in scintillating fashion.
That maul went to work again for prop Wyse to finish the good work of Ugwuero, Thompson kicking the extras.
Fine interplay between Whelan and Krtizinger conjured up the sixth try for Whelan, all converted by Coffey.
Clongowes stayed on task for Wyse and Ugwuero to carry strong with wing Thompson claiming the consolation seven points.
Immediately after, on the pitch, Blackrock were drawn to meet Castleknock in the last four, leaving Terenure to take on Newbridge on the week of March 9th.
BLACKROCK: J O'Sullivan; D Doyle, E Walsh, L Kritzinger (F Mei 48), D Bennett A Quinn 58); H Whelan (L Dignam 54), O Coffey (J Larkin 58); A Mullan (I MvcLoughlin 58), M Yarr (C Hodges 54), G Barron (capt), Thomas Byrnes, M Colreavy, Theo Byrnes (J Angulo 48), S McKechnie, T Brigg.
CLONGOWES: S Pinel; R Thompson, O O'Brien, H Roche-Nagle (H McCallum 50), K Kiernan (P Spillane 46); J McNamee, F Devitt (A Cross 28); J Wyse (capt), K Ugwueru, C Caso (P Brophy 35), A Kelly, I Juntilla (F McGarry 44), M Roche-Nagle, G Strickland (M Lyons 54), D Daly.
Referee: R O'Flynn, Leinster Branch.