FA-84643 / Betting odds conversion / Member archive

Yankee expanded with singles or without the fourfold · case 03

A yankee is settled as 15 lines, or as 10 lines without the fourfold.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Full-cover system bets. system: trixie (3 selections: doubles and treble), patent (3: singles, doubles, treble), yankee (4: doubles, trebles, fourfold), lucky15 (4: singles through fourfold). Wrong selection count returns "invalid". Every combination is a line staked unit_cents; a line with a losing selection returns 0; void selections count as price 1. Return [lines, total stake, total return rounded down].

Why this case matters

Bookmaker settlement expands system bets into combination lines before pricing each one.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
control yankee line count	`[15, 1500, 0]`	`[11, 1100, 0]`	Failed

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