The Rams appeared to be heading for a 2-1 victory at Fratton as the relegation clash entered six minutes of time added-on.
However, Rob Atkinson, who had earlier scored his maiden Pompey goal before putting through into his own net, rode to the rescue by heading home Nicolas Schmid’s long goal kick.
Days earlier the Blues lost in agonising circumstances at Coventry, now they had earned a precious point – and here are Neil Allen’s player ratings...
13. Harvey Blair - 5
(Replaced Josh Murphy on 53 mins) Plenty of effort and always prepared to track back, but everything was all too a little chaotic. Photo: Graham Hunt
14. Adrian Segecic - 6
(Replaced Conor Chaplin on 66 mins) Add a bit more bite to proceedings. Photo: Graham Hunt
15. Marlon Pack - 6
(Replaced Mark Kosznovszky on 66 mins) Gave a bit more physicality and control to the centre of midfield. Photo: Graham Hunt
16. Mark Kosznovszky during the EFL Sky Bet Championship match between Derby County and Portsmouth at the Pride Park, Derby, England on 20 December 2025.
Pompey's Mark Kosznovszky on the attack against Derby. Picture: Steve Mower/ProSportsImages Photo: Steve Mower