Aberdeen lost the lead of the Under 21 league as they went down 1-0 to Dundee.
The first half of the game was an even contest with Chris Clark having the best chance when he hit a shot from just outside the box which came back off the post.
Thirteen minutes into the second half Robb gave the visitors the lead when with the Aberdeen defence backing off he hit a powerful shot home low to Preece's left. Dundee had a chance to extend lead but Preece made a good save turning a Bayne shot round the post. Aberdeen tried to force their way back into the game and were denied a late equaliser when the Dundee defence scrampbled a Mackie effort clear.