Pompey closed the gap on the automatic promotion places with a convincing victory at Accrington.
Kyle Bennett drilled home the opener midway through the first half and Matty Pearson then turned a Ben Davies cross into his own net.
But the best goal of the night arrived just before the interval, courtesy of a stunning long-range volley from skipper Michael Doyle.
Shay McCartan reduced the hosts' deficit late on, but it proved to be no more than a consolation.
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