London Irish kept their slim hopes of quarter-final qualification in the Amlin Challenge Cup alive for 24 hours at least with a 20-14 win at Mont de Marsan.
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A brace of tries from Jack Moates secured a third tournament win in five despite director of rugby Brian Smith naming a second-string side for the trip to France.
The Exiles built on last week's shock Aviva Premiership win at Kingsholm as scrum-half Moates crossed in each half in difficult conditions at the Stade Guy Boniface but Pool One leaders Gloucester will still knock Irish out of the competition if they win at bottom side Bordeaux-Begles tomorrow night.
Moates' first try came when he spotted a gap around the fringes after strong work from his pack after 26 minutes, while the 20-year-old's second was a result of Matt Garvey's charge down six minutes after the interval.
The latter score pushed Irish 17-0 in front after Steven Shingler had slotted his second conversion to go with a 13th-minute penalty as the visitors took control on French soil.
Centre Simon Lucu kept things interesting with a try converted by Thibault Duvallet after 54 minutes but Shingler made it 20-7 with a second penalty 17 minutes later.
Lucu's second try and Jean-Baptiste Claverie's conversion made for a nervy ending with six minutes still to play but Irish held firm to head home with a morale-boosting win.