Rinku Singh added another bright chapter to his legend as a "finisher" with a last-ball boundary as Kolkata Knight Riders beat Punjab Kings by five wickets on Monday to keep their IPL play-off hopes alive. It was a complete 'RRR' show by KKR as skipper Nitish Rana's half-century and Andre Russell adding muscle to the chase of 180 enabled Rinku to finish off the game with a 10-ball-21 not out. Earlier, Varun Chakravarthy once again brilliantly spearheaded their bowling department to grab 3/26 as KKR put up a tidy bowling show to restrict PBKS to a below-par 179 for seven after the visitors opted to bat on a slow wicket. Their second win in a row pushed KKR (-0.079) past Royal Challengers Bangalore (-0.209) to top-five on net run-rate as five teams are locked a mid table rush for playoff with 10 points. Earlier, KKR Impact Player Jason Roy (38; 24b) and Rahmanullah Gurbaz (15; 12b) gave them a flying start when they cruised to 36 for no loss in four overs after they took Arshdeep Singh to cleaners in a 16-run over.