Birmingham City emphatically bounced back to winning ways at St Andrew's with a dominant Championship victory over Portsmouth. 
Paik Seung-Ho opened the scoring within the first 10 minutes before Tomoki Iwata, captain Chrisoph Klarer and substitute Keshi Anderson struck after the break to seal a comfortable victory.
Blues had not won at home since 20 September but produced a ruthless display from set-pieces against a fragile Pompey defence.
The result moves Birmingham up to the top half of the table in 11th and leaves Portsmouth in 20th on 13 points.
Blues boss Chris Davies stated in his pre-match press conference that his side were "not far away" from their best after a slight dry run in the league where they picked up just three points in six games, conceding 10 goals.
The former Spurs assistant was proven right and more in arguably Birmingham's best performance of the season, highlighting how they, like many clubs in the professional game, are prioritising set-plays.
They really did flex their muscles in that area, as all four goals directly involved dead-balls, beginning with Paik's opener.
The South Korea international opened the scoring in the ninth minute with a brave diving header from a corner after a flurry of early chances, rewarding the Blues' relentless start. 
Iwata doubled the lead 10 minutes after the break with a clever near-post flick - also from a corner - before club captain Klarer rose highest to nod in a third from Alex Cochrane's free-kick delivery just after the hour mark. 
Anderson completed the rout on 88 minutes, winning a free-kick before receiving Iwata's ball on the edge of the box and hitting a deflected strike into the roof of the net to cap a fine second-half cameo, much to the detriment of Pompey.
The result extends Portsmouth's winless run to four games as they sit four points above the relegation zone.