Trailing 13-10 at the interval, Mike Ruddock's youthful side delivered a superb second 40 minutes to run out 42-point winners and move into third spot in the Division 1A table.

Blackrock College held the early initative and led 6-0 after just four minutes thanks to two penalty goals from out-half Darragh Fitzpatrick.

Eric Miller's charges looked most likely to register the opening try of the contest, and dominated possession in the opening 25 minutes.

However, the visitors failed to turn pressure into points with winger David Rowan spilling a pass from Fitzpatrick five metres from the line and skipper Fitzpatrick brought down by an excellent tackle from Lansdowne's Matt Healy in the 16th minute.

Full-back Andrew Letham also had his efforts thwarted by four Lansdowne players in the left corner, after a superb delivery by Fitzpatrick.

Lansdowne broke the try-scoring deadlock somewhat against the run of play in the 28th minute after eight phases of play, with Sean Carey, Matt Healy, Foster Horan, Ross McCarron and John Cooney involved, before Ireland Under-20 panellist Horan crashed over the Blackrock line.

Craig Ronaldson missed the resulting conversion, and while Lansdowne had Blackrock under pressure late in the half, a spilled pass saw the visitors burst upfield with Fitzpatrick claiming his side's only try in the 38th minute

Fitzpatrick converted to push his side 13-5 ahead, but Lansdowne finished strongly with an injury-time try from Jordi Murphy to cut the deficit to three points at the break.

Inspired by a stern half-time team talk, Lansdowne took the game to 'Rock in the second half and played some superb rugby.

A minute into the half the hosts grabbed their third try through Neilus Keogh, with Mark Feely providing the assist, and from this point on their was no looking back.

Three minutes later centre Sean Carey secured the bonus point with a fourth try as Lansdowne powered 20-13 ahead.

Injury forced the impressive Horan to leave the fray, but Lansdowne continued to dominate with Carey turning from poacher to provider in setting up Cian Aherne for a 61st minute try.

Out-half Ronaldson shook off the disappointment of four earlier missed kicks to land the resulting conversion, growing in confidence as the game progressed.

Ronaldson would add conversions following each of Lansdowne's subsequent four tries, with Aherne's second touchdown arriving 12 minutes from the end.

Replacement Alan Matthews put his name to the seventh try in the 73rd minute, with scrum half Cooney claiming two late tries as the headquarters club registered their third win in succession.

Lansdowne are now up to third in the standings, two places ahead of Cork Constitution whom they travel to when the league action resumes on Saturday, January 28.

Scorers:

Lansdowne: Tries: Foster Horan, Jordi Murphy, Neilus Keogh, Cian Aherne 2, Sean Carey, Alan Matthews, John Cooney 2; Cons: Craig Ronaldson 5

Blackrock College: Try: Darragh Fitzpatrick; Con: Darragh Fitzpatrick; Pens: Darragh Fitzpatrick 2

HT: Lansdowne 10 Blackrock College 13