Today will be gap up opening expected in banknifty. After opening if banknifty starts trading above 52050 level then possible strong upside rally of 400-500+ points. 51950 will act as an immediate resistance for banknifty. Downside expected 51550 level if reversal happens at this level. For today session 51550 will act as a strong downside support. Any major downside only expected below this level.