Tony Pulis cited a change in formation as key to West Brom's comeback victory over struggling Hull City at The Hawthorns on Monday.
The Baggies fell behind to Robert Snodgrass' 21st-minute opener, but an injury to Jonny Evans prompted a reshuffle before half-time as the hosts went to three at the back.
A second-half revival was kicked off by Chris Brunt, with further efforts from Gareth McAuley and James Morrison completing the turnaround for a 3-1 home triumph.
"We changed things around 30 minutes into the first half," said West Brom boss Pulis in quotes reported by BBC Sport.