FA-84504 / Betting odds conversion / Member archive

Winner excluded from the place part or last place unpaid · case 04

The winner of an each-way bet receives only the win part, or the last paying place is missed.

Member previewVariant 4 · 3 implementations · 9 checks per implementation

Case contract

Each-way settlement with dead heats. stake_cents is the stake of each part (win and place). odds is fractional "a/b"; terms "1/4" or "1/5" is the place fraction of the odds. position is the finishing position shared by dead_heat runners (1 = no dead heat), occupying positions position .. position + dead_heat - 1. Win part: paid if position == 1 with stake / dead_heat at 1 + a/b. Place part: paid if position <= places_paid, with stake scaled by min(dead_heat, places_paid - position + 1) / dead_heat at 1 + (a/b) * terms. Return the total return in cents rounded down.

Why this case matters

Horse-racing settlement applies place terms and dead-heat reductions to each part separately.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
boundary dead heat for last place	`0`	`1500`	Failed

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