Charlie Raglan’s injury-time own goal cost Chestefield two points after the were forced to settle for a 3-3 draw with Colchester.
Chesterfield had battled hard after Drew Talbot was red carded early on, before they went ahead through Dan Jones.
Gavin Massey levelled, before Lee Novak’s close-range finish and Sam Morsy’s volley put the hosts 3-1 up.
George Moncur replied two minutes later, before Raglan turned a stoppage-time cross into his own net as Spireites dropped valuable points for the second week in a row.
Our match photographer James Williamson captured the drama as it unfolded.