Thorns,
Have a look at what scottsbluff has been doing with regards to the question of how many to back. His spreadsheet is very relavent to your question.

It is on this forum, 29th Sept. under the thread "Help to improve profit"

Hello all,


the ratings are the way to go & as l have said if you look around & research you will find free ratings that perform for a profit. But saying that you have to have a personal imput as l will back upto 3 runners from the top selections if l can get overs on ther rating price, but may leave the race if one is under & l think it is a good chance of winning.

We all need to remenber that there is a a of alot of racing these days so it is not a concern for me if l leave a race as we have a vast amount to choose from to secure value.

good luck for the weekend,

scottsbluff