Former Birmingham co-owner David Sullivan was denied victory on his return to St Andrew's as his current club West Ham were pegged back in a 2-2 draw.
The bottom-placed Hammers looked set for a first away success of the campaign after Frederic Piquionne and Valon Behrami had put them in command.
But Cameron Jerome and Liam Ridgewell salvaged a point for Alex McLeish's side.
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