Yorkshire's mind was firmly fixed on promotion at Derby today where their Frizzell County Championship game against bottom-of-the-table Derbyshire was scheduled to get underway.

Captain Craig White called upon his team to make every effort to secure the victory that will take them back into the top flight next season.

With two away matches to play, Yorkshire need 18.5 points to be absolutely certain of going up and a win over Derbyshire would secure them 14 points, plus up to eight bonus points which are on offer.

Beating Derbyshire would remove all the pressure from their last game of the season against Northamptonshire.

Yorkshire have been a Jekyll and Hyde team this season, plumbing the depths in the Totesport League while so far remaining unbeaten in the championship.

And if they come away unscathed from Derby and Northampton, it will be the first time since 1928 that they have gone through a championship season without tasting defeat.

On that occasion 77 summers ago, they won nine and drew 23 of their first-class matches but could only finish third in the championship.

Former Farsley leg-spinner Mark Lawson was included in today's squad in place of off-spinner Richard Dawson, who is out for the season after breaking a knuckle bone in his right hand, while fast bowler Steve Patterson was a late choice ahead of Chris Silverwood, now fully recovered from a hamstring strain.

Hull-born Patterson joined the squad of 12 after bowling nine overs for just 22 runs while picking up his maiden wicket for Yorkshire in their Totesport League debacle against Derbyshire Phantoms on Wednesday.

Byas was complimentary about the bowling of Patterson and Ian Harvey in this match but scathing about the attack in general, which sent down 19 wides resulting in 31 additional runs.

"To give away so many runs in wides was absolute rubbish and without them we would have won the match," said Byas.

"Apart from Joe Sayers, our main batting was also very disappointing and we would have been bowled out even more cheaply but for Joe receiving some solid support late in the order."

Yorkshire (v Derbyshire) from: Wood, Sayers, McGrath, Lumb, Harvey, White, Bresnan, Guy, Lawson, Cleary, Kruis, Patterson.