Former Hull player Cooke was key to Rovers' victory
Hull: (6) 10
Tries: Raynor, Domic
Hull KR: (14) 14
Paul Cooke was at the centre of the action as Hull KR ended their losing streak by beating Hull FC in Cardiff.
Tries: Aizue, Cockayne
Goals: Cooke (3)
His kick-through set up Makali Aizue's opening try before he added a penalty and combined well with Stanley Gene to let Ben Cockayne score a second.
Hull began sluggishly but tries either side of the break by Gareth Raynor and Sid Domic gave them hope.
Cockayne had a late try ruled out for obstruction and Hull laid siege to the Rovers line but they held on to win.
The match was far from a classic but provided plenty of entertainment for the crowd, many of whom were no doubt there to see what happened when Cooke faced his old side.
Whatever happened he was bound to be the centre of attention in the 200th Hull derby, and he certainly was at the start when he knocked-on directly from the kick-off.
But he soon silenced the jeering Hull fans with the kick-through for Aizue's opening try.
Matt Sing wasted a great chance to score when he knocked-on close to the Rovers line and Hull were soon made to pay for that as Cooke added another goal and was then involved in the build-up to their second try.
Cooke and Gene linked up to let Cockayne charge over and score, but only after the referee had accidentally obstructed Shaun Briscoe and prevented putting in a tackle at the vital time.
Hull had a largely ineffective first half but right on the hooter Raynor side-stepped Cockayne to go over on the left-hand side.
After the restart, Danny Tickle's crossfield kick was disastrously fumbled by Byron Ford and Domic pounced to score in corner.
Hull spent most of the next quarter of the game on the front foot, but for all their possession and territorial advantage, they rarely threatened the goal-line.
Cockayne thought he had wrapped up the win with a try on 76 minutes but the score was ruled out for a questionable obstruction on Danny Washbrook.
Hull sensed a second chance and threw everything they could into attack, but Rovers held on to gain revenge for losing the first derby of the season.
Hull coach Peter Sharp:
"I thought we were poor right across the board.
"Our kicking game was embarrassingly poor at times and we turned the ball over five times.
"We just made too many unforced errors and put pressure on ourselves. We need to improve helluva lot."
Hull KR coach Justin Morgan:
"I thought we deserved to win and we were the better team.
"I was nervous for the whole thing. That second half was the longest 40 minutes of my life. I'll be grey and bald by the end of the season if we keep getting games like that.
"We were very desperate defensively and protecting that lead was testament to the players' performance and character. The grit and determination was the most pleasing thing."
Hull FC: Briscoe, Sing, Domic, Yeaman, Raynor, Washbrook, R. Horne, Dowes, Swain, King, Radford, Manu, Tickle. Replacements: Godwin, Tony, G. Horne, Carvell.
Hull KR: Cockayne, Hardman, Dyer, Goddard, Ford, Cooke, Webster, Aizue, Fisher, Gannon, Chester, O'Neill, Gene. Replacements: Lennon, Ward, J. Netherton, Tangata-Toa.