Pompey produced a dominant display at Accrington, but still required a late leveller to leave with a point.
Danny Cowley's side took the lead through an early Ronan Curtis strike and created plenty of other openings, but goals from Harry Pell and Matt Butcher looked to have secured a win for the hosts.
However, John Marquis teed-up Marcus Harness to score in the closing stages and ensure the Crown Ground contest finished all square at 2-2.
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