You could also chase the Favorite dutch style.

Lets say you wanted to win $10 when one of the Fav's get up an also recover any past loss along the way.

Divide the price of the Fav minus 1 into ten dollars.Thats it
Next bet will be the loss plus $10 = Total (Divide the price of the Fav minus 1 ).
Look its all been done before and this method will require a large bank lets say 40 times your target to handle the run outs and at times you will lose your bank.
But this method does,will work.

Cheers
Skater