Buying a cover for CEs is probably a good idea....
12000CE for only Rs.20 This would completely protect us from all upside threat till expiry, for only Rs.20....
Sold 20June 11900 CE+PE @ 89+78=167 CMP 137
Bought 20June12000 CE @ 20 CMP 34
Tracking 20June11800PE CMP 28
Effectively, if we get both side wings for 20+20, then we get a net collection of 167-40= 137, which is becomes a fully profitable trade at expiry, no matter what.
Following these lines, if we see a 50 to 100 point up move, I will be keen on buying
20June11800PE for around Rs20 as well. And then start another set.