View the photos from the Blues' latest away success
Pompey scored in stoppage-time to secure a 2-1 victory at Burton and maintain their automatic promotion challenge.
They went ahead before the break, as Nathan Thompson laid the ball off for Ben Close to bend home a fine finish.
But Burton looked a threat throughout the contest and Liam Boyce headed them back on level terms early in the second half.
It looked like the spoils would be shared, only for Matt Clarke to stab home at the death and secure all three points for the Blues.