hi,
i would like to have the following trigger for horses races
monitor tha race 10 minutes  before the start
- bet will be on the favor as it is on the start of monitoring never change a selection
- calculate the moving average of lay price every minute 
 ( A )- add to the  moving average lay price the value that i will input manual on each race
when the lay price is higher than the total value of moving average + input value then make a back bet with the first lay price is offering 
( B ) -sutract from the moving average of lay price the value (moving average - input value)  and if the lay price is lower of the total of these two values then make a lay bet with the first  back price is offering
in other words:
lay price  >  moving average of lay price + input value =>  back on a lay price 
lay price < moving average of lay price - input value =>  lay  on a back price
THANKS
NIKOLAS