A Harry Crawford hat-trick handed Dartford their third win in a row at the expense of Alfreton.
He opened the scoring with a low drive, Jacob Erskine doubled the lead from the edge of the area and Ryan Hayes prodded in from close range.
It was another low drive from Crawford to make it 4-0 shortly after the break, while Danny Meadows pulled one back from six yards out late on.
But it was to be Crawford's day and he added his third from close range.
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