Yohan Benalouane's goal came after just 74 seconds
Nottingham Forest reached three points in the championship playoffs and one point in Derby County, while Yohan Benalouane's second-minute goal put an end to an intriguing derby in the East Midlands.
Benalouane responded cleverly after the Rams failed to get Joe Lolley's free kick and the 74-second opening gave the tone to an exceptionally open but typically frenetic local competition. , in front of the City Ground.
Martyn Waghorn spoiled a glorious opportunity to tie the game face to face as Derby controlled the ball possession and looked for openings.
Forest, with Lolley and Ryan Yates in the middle of the field, remained a constant threat in the counterattack but did not need the comfort of a second goal as he had just won his first victory over his fiercest rivals in seven attempts.
A second straight defeat for Frank Lampard's Derby left them seventh, just one place ahead of Forest, who climbed to eighth place.
The Rams had a lot of ball and found themselves in many good areas in the last third, but they only managed six attempts.
Forest was encouraged by the goal when Benalouane responded superbly by giving Daryl Murphy the lead after Jayden Bogle's defensive head.
The home team was happy to make possession of the ball and, aside from Waghorn's poor result, tactics worked and created better chances.
Lolley's fierce strike was almost canceled by Yates and Murphy came closer before the break and found himself at a fraction of the score thanks to a low shot between goals.
The Rams, who have now lost three times in a series of four games without a win, have continued to see more ball, but Forest has remained firm.
O'Neill takes us on Lampard
Derby's preference for possession football using Tom Huddlestone as a point of support alongside Andy King was a fascinating contrast in the first period against a Forest player who had opted for a fast pace approach and sought to exploit aging legs, although very cunning, in the middle of the field.
Huddlestone's skilful passes and his ability to see and execute a pass, short or long, made it possible to create several promising situations before the interval.
But the Reds, with Lolley, Yates and Jack Colback, both prominent when they started the offense, presented a constant threat and a greater threat to the goals scored.
Huddlestone 's withdrawal increased the urgency as the match became more fiery and more like a derby.
A sixth red card in eight games between the two teams but Forest kept control of his emotions to win the victory.
The January signing of Yohan Benalouane's goal was his first for Nottingham Forest – for the only sixth appearance of the 31-year-old Tunisian international
Forest Manager Martin O'Neill told BBC Sport:
"We had a fantastic start and that gives you a bit of momentum, Derby had a great opportunity and then we missed a decent chance to do it 2-0, but I'm just thrilled to win.
"There are things that we can improve." In terms of the atmosphere and the crowd, the players encouraged the fans to play in. In the last 15 minutes, the crowd encouraged the players. great.
"Derby had good possession, but we defended very well, we lost ground for a period in the second half, but that was thanks to Derby's good game." But overall I I am delighted to win. "
Derby manager Frank Lampard told BBC Sport:
"We played in the hands of Forest." It's a good organized team, who likes to sit and counter-attack, giving them a goal after two minutes of derby gives them the advantage.
"That was the deciding factor of the game. It was a bad foul to give and then we did not play the ball in the box on two or three occasions.
"But we had 89 minutes to get back in. We controlled a good part of the match, but our quality in the last third was not good enough and that one concerns us."