A late rally was not enough to prevent Pompey suffering a League One defeat at Peterborough.
But they were left cursing a controversial disallowed goal in the second half of a 2-1 defeat.
Jonson Clarke-Harris had earlier given the hosts a commanding lead, but John Mousinho's side felt that Reeco Hackett's effort should have stood.
A Nathan Thompson own-goal proved no more than a consolation, although there was a welcome return to the starting line-up for his brother Louis.
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