Mark Hudson fired home a 57th-minute winner to send Cardiff to the top of the npower Championship with a 2-1 home win over Birmingham, while previous leaders Brighton slipped up again.
Malky Mackay's men had to battle hard to see off the rejuvenated Blues, who had done the Bluebirds a favour by grabbing a shock win over Gus Poyet's side at the Amex Stadium on Saturday.
Craig Bellamy's 38th-minute opener was cancelled out by Leroy Lita's 54th-minute equaliser for the visitors, before Hudson bundled home a cross from Peter Whittingham to take his side above the Seagulls.
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