The League Two hosts were more front-footed from the start of the second half, with the Reds finding it more difficult to make inroads.
Chesterfield’s screw turning paid dividends twice in as many minutes just past the hour.
The opener came when a hoist into the Liverpool area was cleared out to the edge, from where Hobson made a shooting angle. His low drive took a deflection and went through the grasp of a disappointed Mrozek.
A second goal followed almost immediately.
The Reds surrendered possession inside their own box, allowing Will Dickson to feed the ball back to Duffy for a clinical, lashed strike into the far corner.
Mrozek then gloved out a bobbler from John Fleck that might have been creeping inside the post.
Substitute Josh Sonni-Lambie could have provided Liverpool with a response as he got through with time to shape an effort, but he side-footed a couple of yards wide.
Seconds later, though, there was a lifeline. Sonni-Lambie pounced on a short Chesterfield back-pass and unselfishly teed up Gordon, who dispatched with aplomb.
A vital block thwarted Wellity Lucky – picked out at the far post by Josh Davidson – in the last minute as the hosts seemed set to see out a win.
But a short Boot kick out in the second minute of added time was closed down and promptly tucked in by Gordon to claim a draw.
And the Reds grabbed the bonus point offered in a post-match shootout, emerging from 24 penalties with an 11-10 victory.
Team
Mrozek, Ramsay (Kelly, 85), R. Williams, Lucky, Pinnington, Davidson, Laffey, Pilling, Onanuga (Pitt, 71), Bradshaw (Sonni-Lambie, 71), Gordon.
Unused subs: Hall, Miles, Spearing, Airoboma.
