im using 100% of equity, equity = $10,000. Position 1 calculates # of shares by dividing $10,000 by market price, in this case I used 100 units as an example where stock price is $100. Position 1 goes long 100 units, then closes them and calculates a profit or loss for that position. Then on position 2 it goes short 200 units. I could understand going short 200 units had position 1 not closed, but since position 1 went +100, then -100....back to zero, i would have thought position 2 would go short 100 units. I'm merely trying to use System Tester to compare apples with apples....