FA-84830 / Betting odds conversion / Member archive

Lay price converted with the profit instead of the ratio · case 05

Laying at 3.00 is shown as backing the field at 2.00.

Member previewVariant 5 · 3 implementations · 7 checks per implementation

Case contract

Laying a selection at price L (> 1, else "invalid") is equivalent to backing "not this selection" at L / (L - 1). After exchange commission c percent on winnings, the effective price is 1 + (equivalent - 1) * (100 - c) / 100. Return both, rounded half up to three decimals.

Why this case matters

Matched-betting and trading calculators compare lay prices with bookmaker back prices.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
control lay evens	`["1.000", "1.000"]`	`["2.000", "2.000"]`	Failed

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