Thanks jcl.

So mathematically, if one starts with $1,000 and it grows to $2,000 after the 1st cycle,

- the square root rule would give reinvest of $1,414

- the ".9 rule" gives a reinvest of $1,866, with $134 maintained on account for safety.

Is this the recommended way to trade Z8/Z9? In the example above, the next Trade should be with $1,866 capital, not the account's $2,000 balance?

Or is this just to add a bit of conservatism to the backtest and in Trading one should use $2,000?

Thanks.