Dundee United struck late to deny 10-man Dundee victory at Tannadice.
Gary Irvine's first-half dismissal for catching Richie Ryan with an arm gave the visitors an uphill task.
But it was John Brown's side who took the lead when Ryan Conroy blasted the ball high into the net midway through the second period.
United pressed for a leveller and were rewarded in the 89th minute when Michael Gardyne converted Jon Daly's headed knock-down to seal a point.
Dundee remain unbeaten in the Scottish Premier League since Brown took charge in February and the Dark Blues now trail St Mirren by 13 points at the foot of the table. United move level with sixth-place Hibernian.
Jackie McNamara's men made the more determined start, Daly and Rory Boulding both firing wide.
Gary Mackay-Steven had been taken out by some heavy challenges and, when referee Bobby Madden finally lost patience, Jim McAlister received a booking.
Tempers flared again when Irvine led with his arm in a jump with Ryan and the full-back was shown a straight red card, much to his team-mates' dismay.
Brown took action, withdrawing midfielder Nicky Riley and sending on defender Kyle Benedictus.
The hosts tried to make their advantage count and Barry Douglas' inviting centre was headed against the crossbar by Mackay-Steven.
Mackay-Steven seemed eager to make an impression ahead of his first involvement with the Scotland senior squad and the winger weaved his way into the box before forcing a solid stop from Simonsen, the keeper making his debut after joining Dundee on a short-term deal.
Gary Harkins, who had been moved from midfield into a lone striker role, almost gave the Dens Park side the lead with a low, trundling effort at the end of a bustling run towards the edge of the box.
Scrappy play restricted chances after the break with Conroy's free-kick held by Radoslaw Cierzniak and Daly heading off target at the other end.
However, Dundee made the most of a break on the left and Brian Easton's low centre was taken superbly by Conroy before the winger's powerful shot left Cierzniak helpless.
United responded and Daly was denied by Simonsen before chipping the rebound over.
And the pressure finally told when the Tannadice captain nodded a long ball into the path of Boulding's replacement Gardyne, who lifted the ball over the keeper with a crisp finish.
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Live Text Commentary
Full Time The referee ends the match.90:00 +3:30
Stuart Armstrong has an effort at goal from just inside the box that misses to the right of the target.90:00 +2:56
Shot by Ryan Gauld. Davide Grassi gets a block in.90:00 +1:08
Effort on goal by Keith Watson from just inside the penalty area goes harmlessly over the target.88:59
Jon Daly provided the assist for the goal.88:59 Goal scored
Goal! - Michael Gardyne - Dundee U 1 - 1 Dundee A goal is scored by Michael Gardyne from close in high into the middle of the goal. Dundee Utd 1-1 Dundee.88:25
Free kick awarded for a foul by John Baird on Barry Douglas. Barry Douglas restarts play with the free kick.87:30 Substitution
Substitution Robert Thomson comes on in place of Gary Mackay-Steven.85:43
Direct free kick taken by Brian Easton.85:43 Booking
Booking Stuart Armstrong receives a caution for unsporting behaviour.85:28
Stuart Armstrong challenges James McAlister unfairly and gives away a free kick.84:14
The ball is swung over by Keith Watson, Header from deep inside the area by Jon Daly goes over the bar.79:45 Substitution
Substitution Don Cowan is brought on as a substitute for Gary Harkins.79:01
Jon Daly takes a shot. Save by Steve Simonsen. Effort on goal by Jon Daly from inside the area goes harmlessly over the bar.76:28
Kyle Benedictus takes the direct free kick.76:28 Substitution
Substitution (Dundee) makes a substitution, with Kevin McBride coming on for Iain Davidson.76:28
Barry Douglas challenges John Baird unfairly and gives away a free kick.76:07
Michael Gardyne takes a shot. Comfortable save by Steve Simonsen.75:12
Ryan Gauld takes a shot. Save made by Steve Simonsen.74:12
James McAlister fouled by Stuart Armstrong, the ref awards a free kick. Ryan Conroy produces a strike on goal direct from the free kick, Radoslaw Cierzniak makes a comfortable save.
Inswinging corner taken left-footed by Barry Douglas from the right by-line to the near post, Gary Harkins makes a clearance.70:35
Shot by Stuart Armstrong from outside the box goes high over the target.68:08 Substitution
Substitution Michael Gardyne joins the action as a substitute, replacing Rory Boulding.67:40 Booking
Booking Ryan Conroy is cautioned by the ref for unsporting behaviour.66:58
Brian Easton provided the assist for the goal.66:58 Goal scored
Goal! - Ryan Conroy - Dundee U 0 - 1 Dundee Goal scored by Ryan Conroy from inside the penalty box to the top left corner of the goal. Dundee Utd 0-1 Dundee.66:23
Mark Millar sends in a cross, Davide Grassi fouled by Jon Daly, the ref awards a free kick. Free kick taken by Steve Simonsen.65:51
Keith Watson delivers the ball.62:59
Keith Watson crosses the ball.61:50
Steve Simonsen takes the indirect free kick.61:50 Substitution
Substitution Ryan Gauld is brought on as a substitute for Richie Ryan.61:50
Gary Mackay-Steven is ruled offside.60:20
The free kick is delivered left-footed by Barry Douglas from left wing.60:20 Booking
Booking Booking for Kyle Benedictus for unsporting behaviour.60:10
Gary Mackay-Steven fouled by Kyle Benedictus, the ref awards a free kick.59:27
The referee gives a free kick against Gary Mackay-Steven for handball. Ryan Conroy crosses the ball in from the free kick, Brian McLean makes a clearance.58:17
Mark Millar takes a shot. Davide Grassi gets a block in. Effort from just outside the area by Richie Ryan goes over the bar.57:02
Barry Douglas crosses the ball.56:35
Foul by Lewis Toshney on Radoslaw Cierzniak, free kick awarded. Radoslaw Cierzniak restarts play with the free kick.55:09
Strike on goal comes in from Ryan Conroy from the free kick, save by Radoslaw Cierzniak.55:09 Booking
Booking Mark Millar receives a yellow card for unsporting behaviour.55:05
Mark Millar concedes a free kick for a foul on James McAlister.52:00
Ryan Conroy challenges Gary Mackay-Steven unfairly and gives away a free kick. Barry Douglas produces a cross, Brian McLean produces a header from deep inside the six-yard box that clears the crossbar.50:31
Mark Millar delivers the ball.49:44
The offside flag is raised against Jon Daly. Indirect free kick taken by Steve Simonsen.49:02
A cross is delivered by Brian Easton, clearance by Sean Dillon.46:14
Stuart Armstrong is ruled offside. Steve Simonsen takes the indirect free kick.45:01
The referee gets the second half underway.45:00 +1:32 Half time
Half Time The ref blows to signal half-time.45:00 +0:36
Rory Boulding challenges James McAlister unfairly and gives away a free kick. Free kick crossed by Ryan Conroy.44:58
Corner taken by Ryan Conroy from the left by-line, clearance by Brian McLean.43:53
The offside flag is raised against Keith Watson. Steve Simonsen restarts play with the free kick.42:37
Shot from just outside the area by Gary Harkins misses to the right of the target.41:02
Corner taken right-footed by Mark Millar from the left by-line, clearance made by Davide Grassi.36:47
Mark Millar produces a right-footed shot from just outside the box that goes wide left of the goal.36:20
Corner from the left by-line taken by Mark Millar, save by Steve Simonsen.36:09
Gary Mackay-Steven takes a shot. Steve Simonsen makes a brilliant save.34:29
Keith Watson concedes a free kick for a foul on John Baird. Free kick crossed left-footed by Brian Easton, clearance by Richie Ryan.33:06
Richie Ryan challenges Iain Davidson unfairly and gives away a free kick. Iain Davidson takes the direct free kick.30:50
Barry Douglas delivers the ball, Gary Mackay-Steven takes a shot.26:41
Inswinging corner taken right-footed by Mark Millar from the left by-line, save by Steve Simonsen.25:49
The free kick is delivered left-footed by Barry Douglas from right by-line, Davide Grassi manages to make a clearance.25:49 Booking
Booking Iain Davidson goes into the book.25:43
Iain Davidson concedes a free kick for a foul on Stuart Armstrong.24:43
Sean Dillon concedes a free kick for a foul on Gary Harkins. Iain Davidson takes the direct free kick.24:38
Barry Douglas crosses the ball, clearance made by Iain Davidson.22:00 Substitution
Substitution Kyle Benedictus on for Nicky Riley.20:23
Barry Douglas restarts play with the free kick.20:23 Dismissal
Dismissal Gary Irvine is sent off by the referee.20:01
Foul by Gary Irvine on Richie Ryan, free kick awarded.17:51
Barry Douglas restarts play with the free kick.17:51 Booking
Booking James McAlister goes into the book for unsporting behaviour.17:43
Gary Mackay-Steven fouled by James McAlister, the ref awards a free kick.17:00
Stuart Armstrong challenges Ryan Conroy unfairly and gives away a free kick. The free kick is delivered right-footed by Gary Harkins from left wing, clearance by Keith Watson.14:30
Stuart Armstrong has an effort at goal from just outside the box which goes wide of the left-hand post.12:58
Free kick awarded for an unfair challenge on Richie Ryan by Lewis Toshney. Richie Ryan takes the direct free kick.12:16
Jon Daly is ruled offside. Davide Grassi takes the free kick.10:59
Free kick awarded for a foul by Iain Davidson on Jon Daly. Shot comes in from Mark Millar from the free kick.9:06
Inswinging corner taken left-footed by Ryan Conroy played to the near post, clearance made by Brian McLean.8:27
Shot by Iain Davidson from outside the box goes over the net.7:04
The ball is crossed by Gary Mackay-Steven, Close range effort by Rory Boulding misses to the left of the goal.6:25
Unfair challenge on Brian McLean by John Baird results in a free kick. Direct free kick taken by Brian McLean.5:03
The ball is swung over by Barry Douglas, blocked by Gary Irvine.4:03
Gary Mackay-Steven fouled by Nicky Riley, the ref awards a free kick. The free kick is swung in right-footed by Mark Millar, clearance made by Lewis Toshney.3:12
Stuart Armstrong fouled by James McAlister, the ref awards a free kick. Barry Douglas takes the direct free kick.2:55
Shot from close range by Stuart Armstrong misses to the left of the goal.2:24
Mark Millar takes the inswinging corner, Gary Irvine manages to make a clearance.2:07
Barry Douglas crosses the ball, Jon Daly takes a shot. Davide Grassi gets a block in.1:35
Barry Douglas fouled by John Baird, the ref awards a free kick. Barry Douglas takes the free kick.1:10
Corner taken by Mark Millar from the left by-line, James McAlister makes a clearance.0:18
Gary Irvine concedes a free kick for a foul on Gary Mackay-Steven. Barry Douglas delivers the ball from the free kick left-footed from left wing, clearance made by Lewis Toshney.0:00
The referee gets the game underway.
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