Karnataka gained three points after its Ranji Trophy Group C match against Kerala petered out to a draw on the fourth and final day here on Friday. The visiting team extended its lead to 143 runs adding 75 more runs to its overnight 410 for 6. Karnataka's total of 485 for 9 declared was built on a superb double ton by India Test discard Mayank Agarwal (208, 360 balls, 17 fours, five sixes)