This code snippet demonstrates how to implement dynamic position sizing based on equity changes and an optional risk management multiplier in trading strategies using ProBuilder language. The code adjusts the position size according to the strategy’s profit and incorporates a risk multiplier that increases the position size as equity grows beyond the initial capital.

MoneyManagement = 0 //1, 2 or 3
RiskManagement = 1 //0 or 1
Capital = 10000
MinBetSize = 1
RiskLevel = 20
Equity = Capital + StrategyProfit

IF MoneyManagement = 1 THEN
    PositionSize = Max(MinBetSize, Equity * (MinBetSize/Capital))
ENDIF

IF MoneyManagement = 2 THEN
    PositionSize = Max(LastSize, Equity * (MinBetSize/Capital))
    LastSize = PositionSize
ENDIF

IF MoneyManagement <> 1 and MoneyManagement <> 2 THEN
    PositionSize = MinBetSize
ENDIF

IF RiskManagement THEN
    IF Equity > Capital THEN
        RiskMultiple = ((Equity/Capital) / RiskLevel)
        PositionSize = PositionSize * (1 + RiskMultiple)
    ENDIF
ENDIF

PositionSize = Round(PositionSize*100)
PositionSize = PositionSize/100

Explanation of the Code:

• Initialization: Variables for money management, risk management, capital, minimum bet size, risk level, and equity are set. Equity is calculated as the sum of the capital and the strategy’s profit.
• Money Management: Depending on the value of MoneyManagement, the position size is adjusted:
  • If MoneyManagement is 1, the position size is the maximum of the minimum bet size or a proportion of the equity relative to the initial capital.
  • If MoneyManagement is 2, the position size is the maximum of the last position size or the same proportion of equity as above. The last position size is updated to the current position size.
  • If MoneyManagement is neither 1 nor 2, the position size defaults to the minimum bet size.
• Risk Management: If risk management is enabled and equity exceeds the initial capital, a risk multiplier is calculated based on the ratio of equity to capital divided by the risk level. The position size is then scaled up by this risk multiplier.
• Final Adjustments: The position size is rounded to two decimal places to ensure it represents a realistic trading size.

This code snippet is a practical example of how to dynamically adjust trading positions based on profits and controlled risk expansion, suitable for automated trading systems.