The Steelmen were beaten 2-0 by Thame United at Steel Park but that didn’t quite tell the full story as Corby missed two first-half penalties as both Ryan Robbins and Jordon Crawford saw spot-kicks saved by visiting goalkeeper Craig Hill.
Those penalties came either side of goals from Daniel West and Gregory Hackett and the Steelmen were unable to find a way back, even after Thame’s Ben Sturgess had been sent-off in the second half.
Corby remain top of the table after second-placed Berkhamsted also lost but Halesowen Town remain firmly in the hunt in third spot after they sealed a ninth win in a row.
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“We have had two penalty decisions and have missed them and there were probably two or three clear-cut chances as well,” Robinson said.
“But, to be honest, the performance wasn’t good enough and it’s something we are going to have to address quickly.
“I have said before that I have full belief in this squad but towards the end of the second half we ran out of ideas and that’s not what Gary and I are about.
“We will address that on Tuesday and Thursday and make sure it’s right for next Saturday.”
And Mulligan was particularly critical of Corby’s second-half display.
“The mistake for their first goal shouldn’t happen but then we have missed two penalties,” he added.
“The second half was disappointing because they were down to 10 men and our quality wasn’t there. In the first half, the missed penalties have killed us but in the second half, we just weren’t good enough.
“Teams will always come here and make it as hard as possible for us and they defended with their lives in the second half.”
The Steelmen are back in action next Saturday when they head to St Neots Town.