Durham recorded an astonishing win over Derbyshire at the County Ground to put them within one win of claiming their third County Championship in six seasons.
Seemingly heading for a draw after similar first innings scores, Graham Onions' 5-23 inspired the visitors to bowl Derbyshire out for just 63 and pave the way for a convincing nine-wicket victory.
With second-place Yorkshire having to settle for a draw at Hove after bad light and rain prevented them from chasing down a manufactured target of 300 from 64 overs, Durham now lead the way by 27.5 points.
And with only two games left of the season, Durham are very much in the driving seat.
However Yorkshire captain Andrew Gale believes his side may still be in with a chance.
"It's professional sport, there's always a twist in the tale" he told BBC Radio Leeds.
"We have two games we think we can win, and while it looks like Durham's title to lose, you never know."
Derbyshire's loss puts them in danger of the drop once again after three wins in four games had raised hopes of staying up.
And Surrey's loss to Somerset at Taunton potentially consigns them to the drop as well, with Somerset heading for safety.
In the Second Division, Lancashire took 11 points from their draw with Leicestershire to confirm their promotion back to Division One after a one-year absence.
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