COM PlaceBet

[colinbest2]

I'm using the placeBet functionality of the COM and the first parameter to provide is the index of the horse im placing the bet on. The horse at the top of the list being 0, next being 1. However I'm sometimes seeing bets being placed on the wrong horses despite the index being correct. Today a successful bet was placed at index 3 for the right horse, then I placed a bet on the horse at index 4, but the bet was placed on the horse at index 5. Any ideas what could cause this? Is there a better way to place bets? Using selectionId for example?

[colinbest2]

To add some more context I'm waiting for a market to go inplay then placing multiple bets straight away. Could horses be reordering at inplay?

[colinbest2]

I have attached some screenshots as an example. You'll see the indexes being used by the bot are as shown on by Betfair. However the bet was placed on Lucky So And So and not Siberian Star? The code to do this just uses getPrices and the order the horses are returned from that.

[Captain Sensible]

If you've switched markets between bets then it's quite possible the order has changed. Using selectionID will ensure all bets placed on that selection only

[colinbest2]

Ah so it’s possible to use selectionId? The docs say to use the index.

[colinbest2]

Just tried using selectionId instead of an index and placeBet returns "E" so unless theres something else that needs doing differently to use selectionId I don't think its supported.

[GaryRussell]

The order of the market never changes unless you change market and back again. There is currently no way to pass the selection id to place the bet.

The Price object does contain a property named selectionId though. You could create a function that calls getPrices and loops through the selections to find the corresponding index just before you place the bet.

[colinbest2]

Think I’ve figured it out. I realised I was iterating through MarketDepth not prices. Since I’ve changed it to iterate through getPrices and place the bets based on that index it’s not had any dodgy bets.

[GaryRussell]

Yes, that will be why. Should be ok now.