Blues were held to a 1-1 draw by Sheffield United in a PDL fixture at St. Andrew's Trillion Trophy Stadium on Monday afternoon.
In what was an evenly-matched and hard-fought contest, Blues looked to be heading for all three points when Jack Concannon fired the hosts into a 71st minute lead with a fine strike following a corner.
But The Blades earned a share of the spoils after converting from the penalty spot with 10 minutes remaining.
A relatively experienced Blues line-up included Jonathan Grounds, who was playing his first competitive game since picking up a calf injury during pre-season, as well as Wes Harding, Steve Seddon and trialist Josh McEachran.
The Blades made the livelier start and fashioned their first opening after just three minutes when Sam Ompreon fired over from the edge of the area.
Blues had to be thankful to Connal Trueman for keeping out a certain United goal just after the quarter-hour mark.
Harry Boyes' corner found Reece York who looped the ball into the Blues box, where Callum Gribbin's close-range flicked header was expertly tipped over the bar by Trueman.
A minute later McEachran's free-kick reached Odin Bailey, but the Blues striker headed wide from 12 yards.
Blues began to up the attacking pressure, but were struggling to find a way through a well-organised Blades defence.
Some great build-up play from Blues resulted in Steve Seddon's pass reaching Concannon, but the midfielder's attempt was deflected behind for a corner.
Blues continued to press and Bailey had the ball taken off his feet by Blades' keeper Michael Verrips, just as the forward looked to slot the ball home.
Blues were enjoying their best period of the match, but were being frutrated by Verrip.
Firstly he denied Adan George with a low diving save down to his right before producing another smart stop to prevent a certain goal from Bailey.
Half-time: Blues Under-23s 0 Sheffield United United Under-23s 0
Blues made one change at the break, with Joe Redmond replacing Grounds at centre-half.
Chances were few and far between in the opening 10 minutes of the second-half. The first opening fell to United's Harry Sheppeard, but the full-back's snap shot from the right whistled over Trueman's bar.
Much of the play was tending to take place in front of The Blades' well-marshalled rearguard.
But when Concannon did eventually find a way through with a pass to George, his effort was deflected wide for a corner.
From the resultant deadball, Bailey sent in a low cross and Concannon stepped up before sidefooting home a pinpoint shot into the top corner.
Blues made their second substitution of the game on 77 when Josh Andrews was sent on in place of George.
But somewhat against the run of play The Blades were back in it after 80 minutes when Reece York went over in the box and the referee blew for a penalty.
Blades captain York made no mistake as he smashed the resultant spot-kick into the top corner.
With the game into its final period both sides sought to find a winner, but the defences stood firm and they were forced to settle for a point apiece.
Blues (4-4-2): Trueman, Harding, Seddon, McEachran, Grounds (Redmond 45), Bajrami, Medina, Stirk (Boyd-Munce 84), George (Andrews 73), Bailey, Concannon
Subs (not used): Ramos, Burke
Goal: Concannon 71