Pompey dropped one place to fifth in the League One table after suffering a home defeat to Blackpool.
In a game of precious few clear-cut opportunities, Rasmus Nicolaisen went closest for the Blues, first nodding wide from a Charlie Daniels corner and then seeing a shot cleared from the line.
But the visitors broke up the pitch to secure the victory late on, with Jerry Yates burying a shot into the bottom corner of the net.
Fans can watch the key moments (top video) or register with iFollow for extended highlights (middle video) and a full match replay (bottom video).
Please note that if the full match replay is playing the wrong audio, you can use the settings cog to toggle between home and away commentary.