FA-12693 / Auction allocation rules / Member archive

A reserve-qualified winner pays its own bid · case 03

A reserve-qualified winner pays its own bid.

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

For nonnegative integer bids and reserve, sell one unit if maximum bid >= reserve; return payment max(reserve, second-highest bid), using zero when no runner-up. No sale returns None.

Why this case matters

Deterministic teaching model for reviewing auction allocation software; not a representation of any venue or financial advice.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
reserve binds	`23`	`10`	Failed

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