Update - 31 December 2018
NSE Option Chain page is down today. Or the site. I don't know. I executed some wrong trades in the morning based on OI, and then realized that values are not changing. It changed but later when the same values popped up, I checked and it was down.
I got whipsawed based on that. Thankfully, I was able to detect that and change my direction and hoping that current direction is right based on broad trend.
Right now, I have taken a bullish direction. In a bull put spread -10 X 27000 & +10 X 26800, -6 X 26900 & +6 X 26700.
Update - Finally, I rolled down -10 X 27000 to 26900 and currently open position is -16 X 26900 & +16 X 26700. 27000 was very close to strike as a minor gap down tomorrow could have ruined the position.