I think Darky might be right in this instance, I got these LAY results with the system below:

The Rules used were : horseNumber <= 4 and distance < 1001 and lastStart = 1

There were 38142 horse form lines in the database at this point in time. We update when we get time.

There were 180 selections for the System
There were 146 which Lost (did not win race) for the System for a strike rate of 81.11%
You had to pay out $153.86 but brought in $171 after 5% commission. This means a Profit or loss of $17.14 or a percentage profit/loss of 9.52%

The Schmile