Buy order was triggered @170.2. After that OCT future fall to 168.6 missed the opportunity. Now sell order is placed @171.2. waiting to get it executed Today heavy call writing is seen in NTPC at 170, 172.5 & 175 level. 175 seems the biggest resistance according to option data. So I think it will not cross 175 in this expiry. I have to be cautious on upper levels.