Automating overnight lay bets to trade out next day

[stigblomquist]

Hi folks, any help with this would be greatly appreciated.

I have a trading method that works like this:

Lay selections (up to 5 per race) overnight in a number of races scheduled for the next day, then trade out at the off, the expectation being that most of thses selections will drift.

I can do this to a fixed stake, by drip feeding small lays into the market overnight at the best reverse price +1, e.g. lay £3 on Nominated selection 1 at best reverse price+1, fill or kill 5 minutes, until total matched bets for selection > £30. This works well for a fixed stake, but this only works for selections up to a certain price as I would run out of money at higher prices.
What would be better would be to do the above until the liability of matched bets > say £250, then I would know that if there were 10 races I would need £2,500.
What I really need is a condition that says "total liability of matched bets", but it doesn't exist.
Does anyone have an automation file that manages to do something like this with some kind of workaround. I have seen some examples that use servants and stored values but that stuff is too complicated for me to get my head round.
Thanks in advance

[sionascaig]

You can do it by runner (set a max liability) but will need to use a stored value rule using "profit & loss on selection". So you will know if, say max liability per runner is £100 and there are 5 runners the total liability can't exceed £500... That's probably the easiest solution...

You could (probably) set a max liability for the full book and stop laying when that is reached but that would be a bit more work (and use a lot more SV's)... Might end up with a very squint book though...