the first double hundred of alex hales ' career helped nottinghamshire into a position of strength on the opening day of their lv = county championship match against yorkshire at trent bridge .
the england international was unbeaten on 222 not out as the home side reached 393 for seven by stumps , having been invited to bat first .
gale rotated all seven bowlers at his disposal but all found it difficult to put the brake on hales ' scoring .