Despite enjoying a healthy portion of the possession, a soft Birmingham City goal ensured Lee Clark endured a disappointing first return to St Andrew's on Wednesday evening.
Andrew Shinnie latched onto a hopeful punt into Pool's box, and flicked his header beyond Ell Parish, who'd raced off his line in an attempt to clear the danger.
The visitors created a host of half chances throughout the contest, the best of which fell to Tom Barkhuizen, who was foiled by Darren Randolph.
The slender defeat leaves Clark's men 15 points from safety, with games running out in the battle to avoid the drop.
Despite failing to finish his previous two matches, Jamie O'Hara was in the thick of the action early on for The Seasiders, twice testing Randolph, first with a free-kick, then with a half volley from long range.
In fairness it was Blackpool with all of the play in the opening stages, and after Dom Telford had a strike deflected behind, debutant Miles Addison planted a header narrowly over the bar.
It took Birmingham 19 minutes to register their first effort, and you could barely call it that, as Clayton Donaldson flicked David Cotterill's cross harmlessly over, before Gary Madine shot off target for Pool.
A curling effort from Nathan Delfouneso almost opened the scoring, before Donaldson headed Paul Caddis' cross wide when he really should have scored, but the hosts wouldn't be denied.
A hopeful punt into the Pool box had Parish racing off his line, but Shinnie got there first to flick his header over the stopper to make it 1-0.
Instantly after the restart Delfouneso manufactured a chance for himself, but fired wide of Randolph's goal. And for the second time at St Andrew's a set piece nearly got Pool off the mark, as again Addison headed O'Hara's corner off target.
That missed opportunity meant Blackpool went in behind at the break, arguably undeservedly.
Half Time: Birmingham 1 Blackpool 0
After the break there was little to report, with Shinnie shooting over from range, and Blackpool replacing Telford with Barkhuizen. The striker was instantly involved too, lashing a half chance over Randolph's bar.
Highly-rated Demarai Gray then dragged an effort at Parish, before Madine was foiled from close range by Randolph. Clark then opted for a change, replacing Niall Maher with Tony McMahon.
David Perkins' advanced role saw him involved more for Pool, and his through ball put Barkhuizen through, but the youngster shot at the chest of City's stopper.
Grant Hall was next to come close for visitors, latching onto Addison's flick, before swivelling and shooting wide, while former Seasider Wes Thomas shot over for The Blues.
There would be no further chances for either side, as Pool left beaten against
Full Time: Birmingham 1 Blackpool 0