It is a one of the simple and high profitable strategy for H4 and above TF. Thanks for the post. So far i know many fx trader use it.There are no conflict to change the value either 9 EMA or 21 EMA with MACD. It'll be more risk free trade after cross a candle to the 9-21 EMA cross and wait for any kind of reversal candle and then wait for a proper full body candle according to the 9-21 EMA cross trend. Now it's time to trigger your entry.