FA-84769 / Betting odds conversion / Member archive

Negative American payout converted as a positive line · case 04

A two-team teaser at -120 pays 2.20 instead of about 1.83.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Point-spread teaser. legs rows are [team spread line, team margin of victory]; every line is moved in the bettor's favour by points (adjusted = line + points). A leg wins if margin + adjusted > 0, pushes if = 0, loses if < 0. Any losing leg loses the ticket. Pushed legs are dropped; fewer than 2 remaining winners refunds the stake. Payout by winning legs from the American table {2: -120, 3: +160, 4: +260, 5: +400} (5 or more pay +400). Return [status, return cents rounded down].

Why this case matters

Sportsbooks grade teasers with shifted lines, push reduction and a tiered payout table.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
control two-team teaser	`["win", 2640]`	`["win", 2200]`	Failed

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