Championship leaders West Brom extended their advantage over Leeds United to seven points on Tuesday but Brentford's winless run goes on after they slipped up on their travels.
With their nearest rivals in the table not in action until Wednesday, the Baggies recorded a fifth win in six league outings as they overcame a Preston North End side who had Darnell Fisher sent off in the second half.
While Nottingham Forest moved up to third place thanks to a narrow triumph away to Cardiff City, fellow promotion hopefuls Bristol City slumped to a 2-1 loss at Huddersfield Town.
QPR prevailed by a 2-1 score at home to Derby County, too, with Ilias Chair grabbing the winner for the hosts in the 75th minute.
HAL JUST HEAVENLY FOR BAGGIES
Preston are still searching for their first away win over West Brom since 1992 after going down 2-0 at a snowy Hawthorns.
Hal Robson-Kanu opened the scoring in the sixth minute and Jake Livermore doubled the advantage for Slaven Bilic's side in first-half stoppage time, with the visitors' hopes of a comeback curtailed when Fisher was shown a straight red for a challenge on Callum Robinson.
Leeds will hope to cut the gap when they visit Middlesbrough, but Forest are now only three points behind the Yorkshire club after Tiago Silva's 49th-minute goal was enough to beat Cardiff.
BEES BUZZED IN PROMOTION FIGHT
Brentford have now gone four league games without a victory after they were beaten 2-1 at struggling Luton Town.
The Bees were stung by an own goal by Shandon Baptiste in the ninth minute, with Martin Cranie then putting the hosts 2-0 up before the break.
Ollie Watkins pulled one back late on, yet Luton hung on for their 10th win of the campaign, lifting them off the bottom of the table as they climbed above Barnsley.
Huddersfield, meanwhile, moved further clear of the drop zone. Chris Willock and Karlan Grant, who converted from the spot, secured them the three points at the expense of seventh-placed Bristol City.