View the photos from the Blues' League One draw at Spotland
Pompey battled from behind on three occasions to secure a 3-3 draw in a thrilling contest with Rochdale.
Brett Pitman continued his fine form by twice drawing the Blues level at Spotland, cancelling out strikes from Brad Inman and Stephen Humphrys.
It looked as though Ian Henderson had won it for the hosts, however, with a scrambled finish.
But Matt Done headed the ball into his own net deep into stoppage-time to ensure the spoils would be shared.