The home side will wonder how they failed to take all three points from this game. While Sheffield United carved out a chance or two in the second half it was very much against one way traffic.
The Blades had to rely on an excellent display in goal from Adam Davies to keep a charging Birmingham at bay with Demarai Gray twice denied.
Ducksch also saw an effort kept out by Davies and twice hit the crossbar, the first with a header and the second with another free-kick.
There was little argument about Seriki’s dismissal with the defender clumsily bringing down Ibrahim Osman after Patrick Roberts’ through ball sent the forward racing in just outside the area.
Referee Tim Robinson rightly judged Seriki to be the last man with team-mate Tyler Bindon not close enough to be considered a covering defender.
There was no stopping Ducksch’s bullet free-kick from 20 yards either with Davies beaten in the top right corner.
Shortly after Sheffield United were awarded a penalty after a strange miscalculation from defender Robinson following a long floated ball over the heads of the Birmingham defence.
Beadle caught the ball then rolled it to Robinson, who, believing the ball had gone out of play, picked it up and placed it down for a goal kick, the official booking him and pointing to the spot.
It was a lifeline Sheffield United failed to grab with Peck’s spot-kick saved by Beadle in the bottom left corner.
Yet the visitors were level just before the break after Bamford at full stretch brought a long ball from Harrison Burrows under control, rounded the keeper and slotted home from a tightening angle.
It was pretty much all Blues in the second half but as much as they huffed, puffed and created a handful of chances, Davies was in inspired form and they were unable to find a winner.