Substitute Lee Chung-yong earned Bolton their first FA Cup semi-final spot for 11 years with a late winner in a 3-2 victory over Birmingham at St Andrew's.
Johan Elmander and Kevin Davies twice put Bolton in front only for Cameron Jerome and Kevin Phillips to reply for the Carling Cup holders.
But Lee then made no mistake with his close-range header a minute from time to end Birmingham's hopes of a cup double.
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