Banknifty (BNF) fell by 238 points on Friday to create a strong bearish candle on daily chart. BNF too had opening price quite near to high price and saw a consistent fall throughout the day. This created a selling area which is marked on 15 min chart. Please check my video posted on youtube under name Market Movers India for slightly more but similar content. For buying a support near 31000 is possible. So as per charts, buy with a Stop Loss between 30900 and 31000 for a gain of around 200 points.