Chennai Super Kings vs Kolkata Knight Riders. The fixtures involving these two teams usually bring the focus on their spin prowess. An array of finger spinners pitted against two mystery spinners. Eden Gardens or Chepauk, the narrative was largely on the tweakers. As the two prepare to face-off for the first time this season, placed ninth and tenth in the points table, the focus is once again on the spinners. Or rather their dwindling influence given that at both venues, Chennai and Kolkata, the old spin-friendly surfaces have given way to flatter decks neutralising their spinners to a great extent. In a season where scoring rates have already exceeded the previous years, two numbers stand out for Chennai and Kolkata. Beyond Mumbai Indians, whose attack has conceded 11.13 runs per over in the four matches they have played, Chennai and Kolkata haven’t been far off. Chennai have conceded 10.81 runs per over to Kolkata’s 10.68 and much of it is down to how their spinners, who have been their calling cards in the past, have …