by MarkRussell » Sat Apr 15, 2017 10:30 am
Hi,
Sorry you can't do that because of Betfair's "Best Execution" applied to matching.
So if the best lay price is currently 5.0 and you request a lay bet at 20.0 Betfair will immediately match you at 5.0 being the best price on offer.
The only thing you can do is wait for the price to drift to 20.0 and then send your bet request.
You can get the software to do that for you using the Conditional Bet feature.
Regards,
Mark