FA-84394 / Betting odds conversion / Member archive

Odds-on suffix stripped but the price not inverted · case 04

"2/1 on" is priced as 3.00 instead of 1.50.

Member previewVariant 4 · 3 implementations · 10 checks per implementation

Case contract

Parse traditional fractional odds text, case-insensitively: "a/b" or "a-b" with positive integers, "evens"/"evs"/"even" for 1/1, and an optional trailing " on" meaning odds-on (the fraction is inverted, "2/1 on" = 1/2). Zero parts or anything else return "invalid". Return [decimal price rounded half up to two decimals, reduced profit fraction "a/b"].

Why this case matters

Racing feeds and manual price entry use traditional fractional notation with odds-on suffixes.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
boundary odds-on suffix	`["3.00", "2/1"]`	`["1.50", "1/2"]`	Failed

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