Bank Nifty saw call and put unwinding at lower levels while calls were written at 42,400 and 42,500 as they are emerging as local resistance levels. “Out of the two indices, Bank Nifty is the stronger Index and a dip below 42000 can make traders initiate cross calendar spreads on the call side in this index. Traders can use both the monthly and weekly expiries of 42,000 and 43,000 to do this. Bank Nifty also has huge put writing at the 42,000, 41,500 and 41,000 strikes in the monthly expiries, indicating that any fall can be a buying opportunity in this Index".