Blatherwick was off the field for nine minutes, getting treatment on a head injury after Corbett caught him with his elbow accidentally near the halfway line.
The Harriers teenager was booked on 33 minutes for the challenge.
Harriers won their first corner on 40 minutes when Ducros inviting cross was cleared but the set-piece came to nothing. Andy Ducros
Beckett put Chesterfield ahead on 45 minutes, tapping the ball home from close range after Blatherwick beat keeper Clarke to an Edwards corner and headed toward goal.
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