BBC Sport - 2015 Six Nations: Sean O'Brien try for Ireland against Scotland

O'Brien try extends Ireland's lead

Flanker Sean O'Brien scores Ireland's second try against Scotland at Murrayfield, with Jonny Sexton converting to make the score 17-3.

Ireland currently have a points difference of +47 and need to win this game by more than 20 points to top the table before England take on France at Twickenham.

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