I agree. Very reasonably priced too.

Gruss has a cancel-all trigger, they also have it on the software as well,set up a formula to monitor bets taken, as soon as one is the rest are cancelled.

The only issue i see is wouldn't you always be laying the winner, i guess depends what price you offer.

Can you set a lay price for each horse IE horse #1 $10 @$54 liability, #2 $2 @ $30 liability, #3 $4 @ $30 Liability #4 $20 @ $120 liability etc for the whole field. To be cancelled say 1 minute before jump if not matched. Those that are matched can be backed at SP. And set the lay prices an hour plus before the off.

Yep, but there is minimums with SP bets so you have to make sure you have them all high enough amounts to cover that.

That is why I have increased the liability at each stage to provide a $6 payout starting with the minimum $30 liability. If I get matched early at my price I will accept backing the same horse at SP or have the option of getting a higher fixed price at the bookies.

Au contraire, Blackadder. The first one backed at a short price is just as often not the winner, hence the option to cancel. I have often laid 3 horses at 1.60 in the one race within seconds of each other in the UK. If you get two or more you can't lose on the race.

Shaun that looks like a great bot. Have you considered what happens with late scratchings races that jump early etc?

I found it very hard to profit from lay the field in running at $1.60, without live pictures. Too often I was laying a winner and it was going easily in front and saluted. The number of times I got matched on up to four horses (Happy Days) still didn't outweigh the losses.

I think there are certain types of races to avoid and those to target though, but wanted something automated.

I totally back up what's been said about Gruss, it's unbeatable value for money with all the features it has. I have had dealing with both Gary and Mark Russell and they've coded custom spreadsheets for me for reasonable prices and great customer service to ensure I was happy. Other than that, I have no affiliation with them, just a long time user.

I have the luxury of live pictures for most of the UK program and at a reasonable time in WA. I haven't made a large profit from 1.6 lays but it's hard to make a loss also.

That explains your success, you're a lucky man!
I need matchsticks in the eyelids and best guess, no wonder it doesn't work for me. :(