The Bluebirds edged in front in the 62nd minute when Steven Caulker headed home Craig Bellamy’s corner and it was a piece of play which Jacks boss Laudrup was extremely disappointed with.
"It was a very tight game, we knew it was going to be that, and they scored from a set-piece," Laudrup told Sky Sports.
"We know they score goals from set-pieces, and from one corner they scored a goal, which was more or less what they had in terms of chances in the whole game.
"That's how football is and we have to accept it, even if it hurts. Of course, it hurts to lose a derby, but that's how it is.
"We knew in general that they are strong at set-pieces, like some other teams as well, and they scored some important goals in early matches in the season.
"I think in the first half they had three or four, and you can't keep them away from having any corners at all. They had five or six, and the one they scored from wasn't really a chance."
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