Chesterfield's promotion hopes damaged by defeat to York City - how it happened
Liam Mandeville curled home his seventh goal of the season to put the Spireites ahead on 19 minutes but Olly Dyson equalised with an equally-impressive volley just before half-time.
A mistake from goalkeeper Ross Fitzsimons allowed Michael Duckworth to drill in from distance on 51 minutes for the visitors.
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Hide AdPaddy McLaughlin added a third from the edge of the box on 73 minutes to send the Blues to their first defeat in eight games.
The damaging loss leaves Chesterfield