This code snippet demonstrates how to implement a trading strategy in ProBuilder that utilizes Z-Score for decision making and includes a trailing stop mechanism for managing open positions. The strategy skips trades based on the Z-Score and manages exits with dynamic stop-loss adjustments.

//*********************************************************************************
// Z-Score management
ONCE SkipOneTrade = 0
ONCE SkipFlag = 0
ONCE MinTrades = 51 //30 or 51
DirectionSwitch = (ShortOnMarket AND LongOnMarket[1]) OR (ShortOnMarket[1] AND LongOnMarket)
IF Zpos THEN
    IF (CurTrade = 1) AND SkipFlag = 0 AND ((Not Onmarket) OR DirectionSwitch) THEN
        IF N >= MinTrades THEN
            SkipOneTrade = 1
            SkipFlag = 1
        ENDIF
    ENDIF
ELSIF Zneg THEN
    IF (CurTrade = -1) AND SkipFlag = 0 AND ((Not Onmarket) OR DirectionSwitch) THEN
        IF N >= MinTrades THEN
            SkipOneTrade = 1
            SkipFlag = 1
        ENDIF
    ENDIF
ENDIF
//*********************************************************************************
ONCE MA = 100 //100
ONCE T = 1 //1=ema
IF close CROSSES OVER average[MA,T] AND Not OnMarket THEN
    IF SkipOneTrade THEN
        SkipOneTrade = 0
    ELSE
        BUY AT Market
        SkipFlag = 0
    ENDIF
ELSIF close CROSSES UNDER average[MA,T] AND Not OnMarket THEN
    IF SkipOneTrade THEN
        SkipOneTrade = 0
    ELSE
        SELLSHORT AT Market
        SkipFlag = 0
    ENDIF
ENDIF
set stop ploss 500 //500
set target pprofit 5000 //5000
//
//*********************************************************************************
//trailing stop function
trailingstart = 50 //50
trailingstep = 5 //5
//reset the stoploss value
IF NOT ONMARKET THEN
    newSL=0
ENDIF
//manage long positions
IF LONGONMARKET THEN
    //first move (breakeven)
    IF newSL=0 AND close-tradeprice(1)>=trailingstart*pipsize THEN
        newSL = tradeprice(1)+trailingstep*pipsize
    ENDIF
    //next moves
    IF newSL>0 AND close-newSL>=trailingstep*pipsize THEN
        newSL = newSL+trailingstep*pipsize
    ENDIF
ENDIF
//manage short positions
IF SHORTONMARKET THEN
    //first move (breakeven)
    IF newSL=0 AND tradeprice(1)-close>=trailingstart*pipsize THEN
        newSL = tradeprice(1)-trailingstep*pipsize
    ENDIF
    //next moves
    IF newSL>0 AND newSL-close>=trailingstep*pipsize THEN
        newSL = newSL-trailingstep*pipsize
    ENDIF
ENDIF
//stop order to exit the positions
IF newSL>0 THEN
    SELL AT newSL STOP
    EXITSHORT AT newSL STOP
ENDIF
//*********************************************************************************
// graph Zscore coloured(255,0,0,255)
graph TotalWin
graph TotalLose

Explanation of the Code:

• Z-Score Management: The strategy begins by setting up conditions to skip trades based on the Z-Score. Trades are skipped if the Z-Score is positive or negative under certain conditions, helping to avoid entering the market during unfavorable times.
• Trade Execution: Trades are executed based on the moving average crossover strategy. The strategy buys or sells short when the price crosses over or under a specified moving average, respectively, unless a trade is set to be skipped.
• Stop Loss and Profit Targets: Fixed stop loss and profit targets are defined to manage risk and potential returns.
• Trailing Stop Function: A trailing stop is implemented to protect profits as a trade becomes profitable. The stop loss is adjusted in steps as the price moves favorably, securing a part of the gains.

This snippet provides a practical example of combining various trading strategy components like Z-Score filtering, entry/exit rules, and dynamic risk management in the ProBuilder language.