As we move forward we discover a strategy that fits only chosen currency pairs.
Take a look at the next Forex trading system:

Currency pair: EUR/USD.

Time frame: 30 min.
Indicators: MACD (12, 26, 9), Parabolic SAR default settings (0.02, 0.2)

Entry rules: When Parabolic SAR gives buy signal and MACD lines crossed upwards – buy.

When Parabolic SAR gives sell signal and MACD lines crossed downwards – sell.
Exit rules: exit at the next MACD lines crossover or if the market starts trading sideways for some time.