This staking plan was developed by John Kelly in 1956. A good explanation of this staking plan is given on TheStakingMachine site.
Win Estimation – a chance you estimate that your selection (horse) wins.
Divisor – used to divide Kelly’s stake to keep it under reasonable size.
As Liability – if this box is ticked, the final result of Kelly’s plan calculations will be used as bet’s liability instead of stake.