This is a an extremely simple system called: RSI FX KISS h1 (AUDUSD AUDSGD EURUSD)

instrument: FX
time-frame: h1
backtest period: August 2012 to November 2016 (Nicolas might backtest further and report results)
initial capital: 10,000
spread: 2

pairs that I have back-tested on with good results:

AUDUSD: Profit: 25% / 4 =  6.25% PA | Max DD $675 | 67% winning trades

AUDSGD: Profit: 30% / 4 = 7.5% PA| Max DD $677 | 70% winning trades (* > 2 spread will reduce profit and highly correlated with AUDUSD)

EURUSD:  Profit: 26% / 4 = 6.5% PA | Max DD $1494 | 66% winning trades

Negatives: 

• shorts more profitable the longs (but this could be due to recent downtrends)
• there can be long periods of small losses or limited profit

Positives:

• no optimization
• low drawdown
• low consecutive losses
• reasonable profitable

HOW IT WORKS
Buy 1 position if RSI[14] < 30 and exit if RSI[14] >= 60
Sell 1 position if RSI[14] > RSI 70 and exit if RSI[14] <= 40

// timeframe: h1
// instrument: FX
// pairs: AUDUSD / AUDSGD / EURUSD /
//
// SUMMARY
// Buy 1 position if RSI[14] < 30 and exit if RSI[14] >= 60
// Sell 1 position if RSI[14] > RSI 70 and exit if RSI[14] <= 40
//
// Definition of code parameters
DEFPARAM CumulateOrders = FALSE // Cumulating positions deactivated

// Conditions to enter long positions
theRSI = RSI[14](close)

c1 = (theRSI < 30)

IF c1 THEN
 BUY 1 CONTRACT AT MARKET
ENDIF

// Conditions to exit long positions
c2 = (theRSI >= 60)

IF c2 THEN
 SELL AT MARKET
ENDIF

// Conditions to enter short positions
c3 = (theRSI > 70)

IF c3 THEN
 SELLSHORT 1 CONTRACT AT MARKET
ENDIF

// Conditions to exit short positions
c4 = (theRSI <= 40)

IF c4 THEN
 EXITSHORT AT MARKET
ENDIF