Yorkshire were left cursing the weather as rain denied them a likely victory against Leicestershire on the final day at Grace Road.
A total of 60 overs were lost and Leicestershire held out in the play that was possible, finishing up on 157-7, still nine runs behind.
Steve Harmison took 3-52, including dismissing Ramnaresh Sarwan in the opening over, and Azeem Rafiq 2-18 as Yorkshire pushed hard for victory.
However, a sixth-wicket stand of 67 in 24 overs between Wayne White and Ned Eckersley frustrated the Tykes after the duo had come together with the score on 78-5.
A heavy downpour caused an 80-minute delay and the loss of 20 more overs in the afternoon, though the visitors did eventually remove White for a stubborn 44.
More rain sent the players from the field again and although Eckersley was caught off the bowling of Rafiq, there was not enough time left. The result means Leicestershire move off the bottom of Division Two while Yorkshire pocket 11 points to move into second place above Hampshire.
Yorkshire's Adam Lyth hit a career-best 248 not out to leave Leicestershire staring down the barrel by the end of the third day at Grace Road.
Left-hander Lyth hit three sixes and 28 fours in his unbeaten 395-ball knock as he became just the 14th man to carry his bat through an innings for the Tykes. It is also the county's second double centurion of the month, Joe Root having made 222 against Hampshire at the Rose Bowl.
His efforts, along with Jonny Bairstow's century on day two, helped the visitors amass 486 in their first innings, giving them an advantage of 166.
Azeem Rafiq (23) and Steve Patterson (28) offered useful contributions down the order, the latter helping to put on a stand of 77 for the eighth wicket.
Veteran spinner Claude Henderson claimed the final three wickets to finish with figures of 4-126 from 47.4 overs, while team-mate Neil Buck ended with 3-124.
Leicestershire reached 57-2 before rain forced an early finish, Anthony McGrath trapping opener Greg Smith lbw for 26 before Steve Harmison produced a superb yorker to send Michael Thornely on his way for 17.
Adam Lyth and Jonny Bairstow both hit hundreds on day two at Grace Road to put Yorkshire in command against Leicestershire.
Wicketkeeper-batsman Bairstow, left out by England for the opening Test against South Africa after playing earlier in the summer against the West Indies, made 118 from 144 deliveries.
He combined with opener Lyth to put on a fourth-wicket partnership of 197 to help the promotion-chasing Tykes to 336-5 by the close, a lead of 16.
Nathan Buck, who had earlier dismissed Joe Root for a duck, as well as Phil Jaques (30), eventually ended their alliance, dismissing Bairstow for 118.
Yet Lyth proved rock-solid through to stumps, ending the day unbeaten on 159. The ton was his first of the summer in LV= County Championship action - he had managed just 86 runs in his previous five innings.
The Foxes had started the day at the crease on 318-9 but were able to add just two runs before losing their final wicket, centurion Matthew Boyce offering a return catch to Azeem Rafiq in the second over of play.
Matthew Boyce scored his fifth first-class ton to help Leicestershire recover from a poor start on the opening day of their County Championship game against Yorkshire at Grace Road.
The left-handed batsman struck a patient 106 not out as the Foxes reached stumps on 318-9, having been 59-3 earlier in the day against promotion chasing Carnegie.
The 26-year-old faced 224 balls and struck 13 boundaries and was helped by teenager Shiv Thakor who weighed-in with 35 off 76 deliveries.
Opener Michael Thornely battled his way to 31 in two hours at the crease before losing concentration in the last over before lunch, edging a catch behind.
Steven Patterson was the leading Yorkshire bowler, taking the first two wickets to fall and he ended the day with 3-54 from his 24 overs.
However, there were mixed fortunes for Steve Harmison in his third game since joining the Tykes on loan from Durham.
The former England fast bowler took 2-69 in 16 overs but conceded 19 runs in wides and no-balls.
Bottom of the table Leicestershire have won just one of their 10 Division Two games this season.