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Bet Id: 00001
£2.48 x (5.02 - 1) = £9.97 liability (£10 was deducted)
Bet Id: 00002
£3.29 x (4.03 - 1) = £9.97 liability (£10 was deducted)
Bet Id: 00003
£1.13 x (9.8 - 1) = £9.94 liability (£10 was deducted)
I am fully aware that BSP prices are often numbers like 5.021396544334, so some rounding errors are to be expected. Betfair tell me that because minimum liability is £10, £10 will be deducted even if our REAL liability is less than this. So I increased my bet liabilities to £15....and nothing has changed. I am still seeing £15 deducted on all losing bets, including one where my true liability was only £14.59!
Feels like daylight robbery. It will be interesting to see how they explain this "rounding algorithm" and/or where I'VE gone wrong.