The Argentinian international converted first half tries from flanker Niall Ronan and Ireland Under-21 centre Greg Stafford as Andy Doyle's men went 14-0 up at the interval.

'Tarf were off-the-boil and although Donovan Rossi got in for a late try - converted by Dave McAllister - Contepomi's Leinster colleague Ben Gissing's yellow card had already dented their chances.

Lansdowne's Johnny Murphy had put the visitors 19-0 up and was left agrieved in injury time as his potential bonus point try was ruled out for a foot in touch.

Doyle's charges are still bottom, but now just two points behind Carlow and Trinity ahead of next weekend's final round.