I see this “risk free” headline a lot but this was actually risk free (only 1p but still). My bot placed a back bet on an Aus horse market and then cancelled (Fill/Kill) after 5 seconds. However I won £0.01 on the market?

This is the place and cancel log entries in Gruss (3719 and 3720)

This is the Cancelled bet in Betfair bet history (2. Archytas)

And this is the Settled bet in Betfair bet history (2. Archytas)

I’m trying to work out if this is a bug I can exploit. Doubt it but just think of the possibility, this time next year…