Grady Diangana and Dara O'Shea scored the goals that carried West Brom a step closer the Premier League at The Hawthorns last night on an evening of sharply conflicting fortunes for the Midlands rivals.
Louie Sibley's injury-time dismissal, after appearing to kick O'Shea between the legs as they tussled on the ground, was Derby's third red card in four games and adds to manager Phillip Cocu's injury and suspension headaches following this defeat, their first since February.
But Albion, after a slow return from lockdown, have now recorded three straight victories and, despite the bright form Brentford continue to show in third, look to have regained their composure at a critical stage of the promotion chase, moving above Leeds who can regain top place against Stoke tonight
Albion need eight points from their final four games to end their two-year exile from the Premier League.
Elsewhere, Wigan's hopes of avoiding the drop were boosted as Kieffer Moore's first-half strike earned the beleaguered Championship outfit a 1-0 win over QPR.
The result leaves Wigan eight points above the relegation zone with four games left to play.
But having entered administration, the club face a 12-point penalty - against which they are appealing - that will be applied this season if Paul Cook's men finish outside the bottom three.