Bollinger band strategy

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Developed by john bollinger , bollinger bands are volatility bands placed above and below  a moving average .

Volatility is based on the standard deviation , which changes as volatility increases and decreases.

The bands automatically widen when volatility increases and contract when volatility decreases.

Here we are using BB with default settings.

Rules :

Buy rules :

when candle closes above upper band as shown in image , we will buy above high of closing candle 

When candle closes below lower bands as shown in image , we will sell below low of closing candle

When price crosses 20 period moving average in opposite direction of trend , we sill exit 

SL to target ratio must be minimum 1:2