Banknifty made a red candle with lower low, lower high and lower close on . BNF looked weaker today than Nifty ( Nifty made higher low as compared to yesterday). So with such progression of lower high and lower low movements, buying can only emerge near its 20 level which is at around 31975. 32350 is near high created yesterday and today so it is a kind of resistance. Tomorrow being expiry, wild moves are expected so trade with strict SL. A temporary dip will elicit buying (around 20 ) and a temporary rise will provoke selling too (near 32350). Both levels are marked on 15 min chart.
All the best. Happy trading.