The hosts lost Jordan Rhodes just before half-time following an aerial challenge on Joe Rafferty, with the red card looking a tough soft.
The Blues subsequently hit the post three times, yet that masks a fitful performance from John Mousinho’s men who failed to press home their numerical advantage.
A goalless draw means Pompey’s lead at the top of League One is cut to five points – and here are our player ratings...
9. Callum Lang - 6
(Replaced by Christian Saydee on 56 mins) Couldn’t get into the match and was one of those that suffered from his team struggling to get on the ball for the majority of the first half. Took a heavy challenge from Norburn in opening minute of second half and eventually had to come off with an injury issue. Photo: Jason Brown
10. Colby Bishop - 6
Found it tough up against Marvin Ekpiteta in an intriguing battle between the pair. Struggled to bring people into play as a result, but continued to battle away with very little reward. Photo: Bryn Lennon
11. Abu Kamara - 6
Gone off the boil a little at present and it was generally a quiet match for the right winger. Struck the inside of the far post in first-half stoppage time and one good moment late in the game saw his cross strike the post again. But little in between against the 10-men. Photo: Jason Brown
12. Portsmouth midfielder Myles Peart-Harris (44) during the EFL Sky Bet League 1 match between Blackpool and Portsmouth at Bloomfield Road, Blackpool, England on 9 March 2024.
Pompey's Myles Peart-Harris on the ball against Blackpool. Picture: Jason Brown/ProSportsImages Photo: Jason Brown