Local outfit batting first posted a decent 129/7 in a rain reduced 16-over-a-side game, thanks to late slurry from Wriddhiman Saha (17 off 10) and Murali Kartik (17 in 13). David Hussey top-scored with 12-ball 26 while Ganguly chipped in run-a-ball 20.
In reply Bangalore Royal Challengers limited to 124/4 despite White's (30 off 16) cameo effort and rearguard action from Boucher (50* off 40). J Arunkumar made a strokeful 22 with five boundary hits.
Kolkata opening attack Dinda and Ishant bowled a tidy first spell conceding too little besides packing off dangerous Chanderpaul (7 off 11).
Ganguly bowled an exceptional spell on a wicket conducive for his kind of bowling. The Prince of Kolkata bowled wicket to wicket and cramped the batsmen for room with an immaculate line and length. He conceded as few as 7 in his three overs besides claiming the wicket of turtle-esque Dravid (5 off 11).
Bangalore outfit messed up the chase with a poor start and some pedestrain batting in the middle overs. B'lore crawled to 55 in 10 overs that left Boucher and White with big ask of scoring over 13 per over. And to rub salt to injuries Ishant made things difficult for B'lore with two economical overs in the fag end.
Boucher and White did their best amassing runs from the weak links in Kolkata bowling department. The duo scored bulk of their runs from Shukla, Kartik and Gul but that wasn't good enough to help their side's cause.
Earlier Steyn restricted Knight Riders charge with a fiery spell of pace bowling. The South African returned with the figures of 3 for 27 as he alongwith Zaheer and R Vinay Kumar kept a tight clamp on the Kolkata batsmen.
The initial burst from the opening attack of Bangalore unit reduced their Kolkata counterparts to 20/2 in the fourth over.
David Hussey and skipper Ganguly briefly threatened to shift the balance towards Kolkata, putting on 26 in three overs before both were run out in a space of eight balls.
Taibu and Shukla got starts but couldn't capitalise on it as Kolkata failed to put any significant partnerships. However late slurry from Saha and Kartik, who shared a quickfire 34 runs in just under four overs, helped Riders post a respectable total.
Bangalore with two wins in eight games were left with an Himalayan ask of six wins in as many games to make it to semis'.