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If the Deer Park side were left to rue anything, it was that the second half of their innings fell away when they could have been setting Chesterfield anything from 230 to 250 to win.
Chesterfield needed seven and, after a couple of singles, four leg byes brought them rather fortunately level.
When they tied for the first time, it was against leaders Swarkestone and Dunstall knew they should have won the game: on reflection they could take the positive from it that they had proved they could compete.
However, George Scrimshaw, 15 year old son of Steve, put the Spireites on the back foot with a startling spell of three wickets.
Never giving up and always trying something different finally had its rewards even when only a second defeat in 10 matches seemed certain at the hands of Chesterfield.
die Dunstall grab tie from jaws of defeat to keep revival going
He had Lacey leg before two short of his 50 and bowled Lang, who, quite unnecessarily it seemed, tried to hit him out of the ground.
He was particularly severe on Ross Whiteley, whose bowling is out of sorts, and he overtook Benstead to reach 50 first but there was relief for Chesterfield when he got a leading edge to a ball from Nike Kobe 9 Low Beethoven Brian Gladwin and chipped it to Simon Lacey at cover.
Ben Slater looked in no trouble in the reply, sending a series of on and off drives to the boundary, but Steve Scrimshaw soon had Mykylo Bird leg before.
They were exactly halfway to the target at 25 overs and when Gouldstone, usually the safest of catchers, put Lacey down first at slip, then at short midwicket, both off Elstone, Dunstall were struggling.
determination is why they are nearly safe from relegation after starting the season as most observers' favourites for the drop and then having a go at proving those people right by not winning in their first 11 matches.
At 72 4, Dunstall were suddenly on top but Simon Lacey and Matt Higginbottom set about taking the game away from them.
Lacey, as always, was calmness itself, while Higginbottom, occasionally riding his luck, hit the ball very hard. Chesterfield want him to make more of his batting and it is easy to see why.
Gladwin was leg before to the next ball and Dan Bennett edged the hat trick ball only a foot short of Benstead at slip.
Johny Marsden played across the line to Elstone and was bowled, then Higginbottom lifted a long hop from Steve Scrimshaw straight to deep square leg, a reckless end to a fine innings.
The Derbyshire opener survived another shout for caught behind and was bowled by the next ball, trying to turn it to fine leg.
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After the loss of Ben Whitehouse, Jamie Benstead and Scott Elstone added 116; their third century stand in recent weeks, along with another of 98.
run out by young spinner Sam Lang, fielding Benstead's drive off his own bowling and Nike Kobe 9 Elite Black
Benstead proved perhaps an unlikely catalyst for a change in fortune when his occasional seamers were introduced for the 42nd over, with only 26 needed.
On Saturday, they were, on the "other side" of the tie. It was Chesterfield who went away kicking themselves for not winning, after reaching 183 4 in pursuit of 209 to win with run rate not a problem.
They work well together, Benstead's steady accumulation an ideal foil for Elstone's stroke making.
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DUNSTALL'S second tie of the season demonstrated amply just how and why they have turned their season around in the Beechwood MG Derbyshire Premier League.
He nipped one back to bowl Whiteley, had Paul Burdett leg before first ball and then, the big prize, bowled Slater.
Higginbottom reached his 50 with a big six off Martin Clewley and the 100 partnership came in the 39th over.
There was one last twist, as Steve Scrimshaw slipped the next ball into Bennett's pads, right in front, and both sides finished up with 208 after the most fascinating of matches if you were a neutral.
Gladwin was the beneficiary, with Benstead also stumped, Tom Hill and Andy Malkin caught in the deep and Steve Scrimshaw leg before to give the slow bowler six wickets.
Pulling it out of the fire from there left Dunstall feeling like the winners; and that was just as Swarkestone had felt in the first tie.
Callum Brodrick came and went, stumped charging Gladwin, but Benstead and his captain, Matt Gouldstone, put on 63 in a busy partnership.
throwing down the stumps from a prone position, and Dunstall then threw away a series of wickets in the search for quick runs.
Chesterfield moved on to 57, although Whiteley was also looking out of sorts with the bat and Slater survived a very confident shout for caught behind.
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