This code snippet demonstrates how to implement a dynamic money management system and handle positions over the weekend in a trading strategy using ProBuilder language. The money management system adjusts the position size based on the strategy’s profit, and the weekend handling ensures that all positions are closed by Friday night to avoid holding them over the weekend.

once startpositionsize=1
once positionsize=startpositionsize
once flatoverweekends=1
once startequity=0
once Reinvest=1

if reinvest then
    //------------ Fixed fraction money management ----------
    once multiplier=1
    once delta=200 // < == THROTTLE
    once fraction=delta*pipvalue
    once newlevel=delta*pipvalue
    once oldlevel=delta*pipvalue

    if strategyprofit+startequity>newlevel then
        multiplier=multiplier+1
        oldlevel=newlevel
        newlevel=strategyprofit+startequity+multiplier*fraction
        positionsize=multiplier*startpositionsize
    elsif strategyprofit+startequity=2 then
        newlevel=strategyprofit+startequity
        oldlevel=strategyprofit+startequity-multiplier*fraction
        multiplier=multiplier-1
        positionsize=multiplier*startpositionsize
    endif
Endif

if flatoverweekends then
    //--------------- daylight-saving corrections ------------------
    if currentmonth=3 and day>=15 then
        dlc=10000
    elsif currentmonth=11 and day<8 then
        dlc=10000
    else
        dlc=0
    endif

    fridaynight=(currentdayofweek=5 and time>=(223000-dlc))

else
    fridaynight=0
endif

if fridaynight then
    if longonmarket then
        sell at market
    elsif shortonmarket then
        exitshort at market
    endif
endif

The code snippet above includes several key components:

• Initialization: Sets initial values for position size, whether to flatten positions over weekends, starting equity, and whether to reinvest profits.
• Money Management: Adjusts the position size based on the strategy’s profit. It uses a fixed fraction method where the position size increases or decreases based on predefined profit thresholds (delta).
• Weekend Flattening: Includes logic to close all open positions on Friday night before the market closes for the weekend. This is adjusted for daylight saving changes by modifying the closing time.
• Daylight Saving Time Adjustments: Adjusts the trading cut-off time on Fridays based on daylight saving time changes in March and November.

This example is useful for understanding how to dynamically manage investment size based on performance and how to mitigate risks associated with holding positions over the weekend in financial markets.