A superb morning session left Yorkshire on course for victory in their LV= County Championship match against Glamorgan at Headingley.
At lunch on day three, the hosts had reduced their opponents to 113-6 in the second innings, giving a lead of just 41 runs.
Four wickets fell before the interval after Glamorgan had resumed on 27-2, Moin Ashraf leading the way with two of them to remove Will Bragg for 25 and Stewart Walters for nine.
Steven Patterson also struck to oust David Lloyd for a duck, before Bradford-born Anthony McGrath trapped Ben Wright lbw for 21.
Jim Allenby was the only Glamorgan batsmen to show any resistance, reaching the interval on 40 not out.
If Yorkshire win then promotion will definitely be in their own hands ahead of their final Division Two match of the season at Essex next week.
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