Boss Molby fielded the experience Clarkson at left-back, while Medou-Otye was in midfield. Ian Clarkson
Harriers actually enjoyed the better of the first eight minutes without test keeper Pollitt before the home side forced their first corner.
Smith had to clear into touch and Harriers, who often struggle at set pieces, did not defend this one convincingly.
Beckett got the better of Smith on nine minutes and fired a low shot just wide from the edge of the area.
Then Beckett hit the post two minutes later after the determined Ingledow had laid the ball into his path six yards from goal.
Williams dragged a shot off target after twisting and turning makeshift left-back Clarkson.
Dangerous midfielder Williams was causing problems down the right and he won another corner in 19 minutes after a raking cross that Shail had to head away from the danger zone.
Clarke tipped away his resulting set piece and Harriers survived again.
Chesterfield thought they had broken the deadlock on 22 minutes when Ebdon drove Edwards' cut-back goalwards but the ball bounced down off the bar and fell the right side of the line for Harriers.
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