Alex Lees tormented Derbyshire with a mammoth 275 on Day 2 at Queen’s Park – and the home side are already five down in reply.
Andrew Gale and Gary Ballance added half-centuries for the visitors who declared their first innings on 617-5 midway through the afternoon session.
And Derbyshire were tottering on 94-5 by the close as wickets were shared between the penetrative seam trio of Ryan Sidebottom, Steven Patterson and Jack Brooks.
With Yorkshire starting the day 367-2, Derbyshire were in desperate need of a cluster of early wickets if they were to stay in the match.
The visitors had other ideas, however, as Gale hit the accelerator pedal and passed 50 off 72 balls, with seven fours, despite a conservative start to his innings on the previous day.
The next landmark was Lees’ double-century, in 321 balls with 30 fours, as the Halifax-born opener became, at 20 years and 95 days, Yorkshire’s youngest ever double-centurion.
And, although Peter Burgoyne bowled Gale for 74 to grab his first LV= County Championship wicket, Yorkshire took lunch completely in control at 509-3.
Ballance opened his shoulders after the interval to pass 50 - in 88 balls with four fours and two sixes - before he was stumped by Tom Poynton for 66 at 580-4.
Lees continued past 250 – in 415 balls with 16 fours – and the Yorkshire opener was unbeaten on 275 by the time Adil Rashid (7) departed, caught behind off Mark Footitt, to cue the Yorkshire declaration for the joint-11th highest total in their history.
Lees’ 436 ball 275 – with 38 fours and a six – was the highest score for the white rose since a Darren Lehmann triple-century in 2006. It was the third-highest ever individual score at Queen’s Park.
After one and a half days in the field, Derbyshire’s reply hit the rocks early when Chesney Hughes was trapped lbw by Sidebottom, for 12, making the score 17-1.
After taking Tea with 28 runs on the board, the home side’s prospects were dealt a double-blow by Steven Patterson approximately an hour after the resumption.
Wayne Madsen’s inside-edge was caught at the wicket before, two balls later; Durston was adjudged lbw, leaving Derbyshire 52-3.
Dan Redfern joined fellow Academy graduate Ben Slater in a battling stand of 28 that took the home side to within 25 minutes of the close, only for Redfern to perish - caught behind off Jack Brooks - for 12, making the score 80-4.
Disaster then struck for the local boy as Slater suffered an identical fate in Brooks’ very next over to depart for 28, leaving Karl Krikken’s men with a mountain to climb.
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