See, when you can see a downside of 20K, it can even touch 18.7K ..18.7k is too far fletched as per me.. Dont see Nifty breaking 20k in worst to worst case scenario.
Generally what happens: ,
whenever prolonged downside / upside happens it goes beyond the expected lower side / expected upper side. that is the tendency.. overshooting .. that is how the market behaves.. so , dont be surprised to touch 18.7k when you are already expecting 20K... but it may not stay there for longer period , just touch and go.....