//@version=4
strategy("My Strategy", overlay=true)
rsi = rsi(close, 14)
ema20 = ema(close, 20)
buyCondition = rsi < 30 and close > ema20
sellCondition = rsi > 70
if (buyCondition)
strategy.entry("Buy", strategy.long)
if (sellCondition)
strategy.close("Buy")