Pilgrims front man Luke Jephcott looked liked he had handed the visitors all three points with two second-half strikes.
However, substitute Curtis and the recalled Bolton denied them a telling win at Fratton Park as the Blues rescued an unexpected point.
Irishman Curtis deserves credit for the comeback, with his persistence getting Pompey back in the game.
Meanwhile, Bolton was equally important with his header three minutes from time earning the draw.
Here’s how our chief sports writer, Neil Allen, rated their performances – plus those of their Pompey team-mates.
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4. Sean Raggett - 7
Full blooded and involved in the equaliser, also claiming it. Photo: JPIMedia