Nifty after seeing a continuous fall in the October series has reached a very crucial level of 10100. Technically it is well placed on a support which has given bounce back twice since December 2017. If we look at the Option chain data for November 2018 series, immediate major Open Interest concentration is seen at 10300 levels on the Call side and three times the Open Interest concentration (as compared to 10300 Call) is seen at 10000 levels on the Put side. Thus again giving us an idea that based on Open Interest data 10000 may act as a strong support. But since November series has not opened on a positive note (Nifty closed 0.8 % down dated-25th October 2018) and keeping into mind heavy Shorts Built Up in Nifty, it cannot be immediately said that Turnaround will be evident. So keeping this in mind we can see that if Nifty falls below 10000 Levels then a free fall can be seen till the 9600-9800 levels, but if it starts moving up and Open interest is being built up on the positive side, then maybe after observing it till the levels of 10300, a rally can be expected in Nifty on the bullish side.