Birmingham manager Lee Clark praised game-changing substitutes Wes Thomas and Nathan Redmond as they inspired the turnaround that brought a 3-1 home win against Derby in the npower Championship.
Birmingham were behind at half-time in the St Andrew's tussle, but in the second 45 minutes they were a changed side.
Clark brought on both Thomas and Redmond for the start of the second half in what turned out to be an inspired step. Thomas netted twice and Redmond scored his long-awaited first of the season as Birmingham won at home for only the sixth time this season to ease relegation fears.
Clark said: "Even thought there was not too much difference in the first half I thought that Derby were gaining momentum by each minute and the game was there to be taken if we wanted it.
"Derby have a lot of energy and a great work ethic and we had to match that if we were to get anything from the game.
"They were more energetic than us in the first half and I decided to get the two lads on with a bit of power and pace. I am delighted for both of them."
Derby have now gone eight games without a win and manager Nigel Clough must be concerned with how his side collapsed in the second half facing Birmingham's goal onslaught.
Afterwards Clough was disappointed with the result and Derby's inability to build upon their first-half lead.
Clough said: "We played pretty well at times but didn't get a result. We need to do more to get that second goal.
"When you are on top and leading by a goal it isn't going to remain like that in Championship games. We should have scored more than one goal in the first half particularly when a team is struggling at home."