New Zealand's Trent Boult, center, celebrates the wicket of England's Ben Stokes during their first cricket test in Auckland. Pic/ PTI

Fast bowler Trent Boult scalped a six-wicket haul before skipper Kane Williamson struck a 91-run knock to put New Zealand in driver's seat in the opening day of the first Test of the two-match series against England here at the Eden Park on Thursday.