ok let me try and give a explaination of greening up
you back redrum for £2 at 3.05 and lay him for £2 at 3.00, so your p/l is as follows
A) redrum wins collect £4.10 on back and pay £4.00 on lay so you win £0.10 in total.
B) redrum loses you lose £2 stake on back and collect £2 on lay so you are even.
To win regardless of result you need to increase your win on the lay without your stake going above what your win on the back would! ( with me so far class?

)
The easiest way to do this is to divide your back profit by the current lay price ( this is what the greenup function does) so in the above example divide £0.10 by say 3.00 as current lay price, this gives you £0.0333. So we then lay redrum again for £0.03 at 3.00 changing your p/l to the following
A) redrum wins you collect £4.1 on the back and pay £4.06 on the lay, so you win £0.04 in total.
B) redrum loses you lose £2 stake on back and collect £2.03 on lay so you win £0.03 in total.
Hey presto you now win regardless of result! simples
