It's one side bullish strategy. It doesn't mean BNF will go up only. Trade is activated only when BNF give 15 min closing above 36500.
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BNF opening at 36500. There could be heavy selling even if 15 min closing is above 36500. So let the market go down as much it wants and when it gives 15 min closing above 36500 then take trade. (Just an idea, trade as per your own analysis)