This code helps you to trail a discretionary short position in USDJPY or any other USDXXX pairs. You enter the level where you want to go short with a stop entry order and you enter the level where you want your stoploss. Additionally you enter the spread and your accountsize and the EURUSD conversion (for euro accounts). Your positionsize is calculated based on 0.5% risk of your accountsize. If you use a 1 minute timeframe, the stop entry order will be placed within a minute after running the strategy. You will be filled once the price hits your stop entry order. The stoploss order will now be placed with a 0.5% risk of your accountsize. Once the position comes into profit, half of your position will be exited when the close of the 1h chart crosses above the moving average 10. The remaining position will be closed once the close of the 1h chart crosses above the moving average 20. In case the 1h closes above the moving average 20 without closing above the moving average 10 first, your full position will be closed at once.

This code is quite specific, but hopefully it can be useful for those who want do do something similar.

(This is not a fully automated strategy)

defparam preloadbars = 10000
defparam cumulateorders = false


// manualy enter these variables
spread = 0.01
accountsize = 25000
entrylevel = 146.662
stoplosslevel = 146.937
eurusd = 1.0387

// calculate the desired loss and adjust the entrylevels for spread
loss = 0.005*accountsize*eurusd
entrylevel = entrylevel -0.5*spread
stoplosslevel = stoplossniveau+0.5*spread

// calculate the desired position size
Positionsize = (loss / ((stoplosslevel-entrylevel) * (pipvalue/pipsize)/close))

// can only do 1 trade
c1 = TradeIndex(1) = 0

// Short entry order placement with stoploss
IF NOT ShortOnMarket and c1 THEN
Sellshort Positionsize CONTRACTS AT entrylevel stop
Exitshort at stoplosslevel STOP
ENDIF

// Initial stoploss placement
IF ShortOnMarket THEN
Exitshort at stoplosslevel STOP
ENDIF

timeframe(1h, updateonclose)
// Trailingstop exits based on 1h MA10 and MA20 once in profit
once fullposition = 1

IF ShortOnMarket and trailingstop <= entryniveau THEN
if close crosses over average[20] then
Exitshort countofposition contracts at market
else
if close crosses over average[10] and fullposition = 1 then
Exitshort (0.5*COUNTOFPOSITION) contracts at market
fullposition = 0
SET STOP $LOSS 0
endif
endif
ENDIF