In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.
//@version=2 strategy("My Strategy", overlay=true) longCondition = crossover(sma(close, 50), sma(close, 200)) if (longCondition) strategy.entry("My Long Entry Id", strategy.long) shortCondition = crossunder(sma(close, 50), sma(close, 200)) if (shortCondition) strategy.entry("My Short Entry Id", strategy.short)