Derby County had to settle for a 3: 3 draw with Brentford.
The Rams led the race three times, but each time they were pushed back by the Bees on Saturday's Sky Bet Championship at Griffin Park.
Harry Wilson double-handed Frank Lampard's men to 14, while Jayden Bogle scored the first goal of his career.
However, Brentford responded through Julian Jeanvier, Neal Maupay and Said Benrahma, who scored the home side's goal in the 83rd minute.
Derby remains seventh in the table, but is now two points out of the play-off zone.
Not surprisingly, Lampard chose the same team that started last weekend with Rotherham United's 6-1 win.
However, there was a change on the bench, replacing David Nugent's 10-goal striker Jack Marriott in the squad.
Former Brentford winger Florian Jozefzoon, who moved from the Bees to Derby last summer, has no place in the 18 years.
Richard Keogh, the skipper of Rams, went on to play through the pain and wear a plaster to protect his broken hand.
Marcus Olsson, Craig Forsyth (both knees), Curtis Davies (Achilles) and Andy King (ankle) stopped.
Brentford coach Thomas Frank made two changes, beating them 3-0 in the week under Swansea City.
Rico Henry returned after a foot injury while Ollie Watkins was placed on the grid.
Moses Odubajo and Sergi Canos were the players who made way and fell on the bench.
Daniel Bentley (shoulder) and Yoann Barbet (ankle) both missed due to injury.
The opening stages were evenly contested, with no side initially giving an inch.
A frenetic start was stopped when Scott Malone remained down after a collision with Henrik Dalsgaard.
Neal Maupay had the first glimpse of the net in the ninth minute, but his snapshot from the edge of the penalty area was comfortably held by Kelle Roos.
After Tom Lawrence Ezri Konsa fouled before the attack on Jeanvier, there was a scuffle. However, referee John Brooks calmed the situation and kept his cards in his pocket for the time being.
Derby was the first start when Mason Mount pushed a pass to Wilson, but his right foot shot had no strength and Luke Daniels saved to his right.
Moments later, Brentford did not manage to get into the box with a long ball, but Daniels stormed out to prevent Martyn Waghorn's attempt.
The Rams kept up the pressure, and when the home side took possession 13 minutes into the game, Lawrence sat down with Wilson on the left foot and a deep shot from outside the area into the bottom corner of the net.
Malone could not shake off his injury and was replaced by Ashley Cole.
Derby regrouped but Brentford equalized in the 23rd minute.
The corner of said Benrahma from the right was hit near Jeanvier, who made a first shot at Roos from 10 meters away.
The Rams responded and rebuilt the leadership within three minutes.
Bogle moved to the edge of the area and had Duane Holmes to his right.
However, when Holmes slipped, the full-back decided to walk alone and pulled through a narrow gap before making a deep, angled shot over Daniels.
Once again, Derby could not retain their advantage.
Brentford threatened from another corner, but this time Dalsgaard's header was straight at Roos.
It was 2: 2 in the 31st minute. A quick break from the bees ended with Henry's cross from the left, which Maupay sent in at the nearby post.
That was the end of the Goalmouth campaign for the first half.
However, the drama continued at the beginning of the second period.
Daniels did well to tip Fikayo Tomori's post around the post after Mount's free kick.
Soon after, Cole went into the pits under a challenge from Maupay and was convinced that he had won his team with a penalty.
The referee contradicted and booked an angry Cole for diving.
Waghorn struggled with a stroke he suffered late in the first half and soon had to be replaced by Mason Bennett.
The Rams had to keep their heads in a bad temper.
Benrahma just fired after a smooth Brentford move, while Watkins saw a shot blocked well.
Derby had another penalty after the ball hit Henry's arm in the box, though he could not have done much to avoid it.
Immediately after the hour, there was an exit for the Rams.
Roos spilled Dalsgaard's cross to Watkins' feet, but somehow recovered to refuse him and then Maupay.
Brentford was in the lead and Watkins took a shot from a great position before Maupay lost the effort.
Derby almost took the lead in the 73rd minute.
Bogles Ball from the right was steered by Lawrence in the path of Mount, who made a good connection from 12 meters, but hit his shot against the post.
The Rams made it in the 78th minute 3: 2.
Tomori shared the defense with a great passing ball, and Wilson stayed calm before deflecting a shot over Daniels from 12 yards.
Could derby hold this time?
They had a chance to build on their advantage when Mount and Bennett teamed up to release Lawrence, but he was denied a fine by Daniels.
It was a crucial moment when Brentford equalized for the third time in the 83rd minute.
Substitute Canos played the ball from the right, and a strike by Keogh allowed Benrahma to go unchallenged to the edge of the region, where he was clearly ahead of Roos.
Benrahma then saw a shot deflected just forward, the keeper had a fake foot as the hosts felt the victory.
It was Derby who finished well, but there should be no winner at the last minute.
BRENTFORD: Daniels, Konsa, Jeanvier, Bech Sorensen, Dalsgaard, Mokotjo (Dasilva, 46), Sawyers, Henry (Odubajo, 62), Watkins (Canos, 77), Benrahma. Other subdivisions: Balcombe (gk), Oksanen, Marcondes, Forss.
DERBY COUNTY: Roos, Bogle, Keogh, Tomori, Malone (18), Johnson, Mount, Holmes (Bryson, 74), Wilson, Lawrence, Waghorn (Bennett, 50). Other Subjects: Carson (gk), Wisdom, Huddlestone, Nugent.
REFEREE: J Brooks (Leicestershire).