FA-83942 / Sports scoring and tiebreakers / Member archive

Serve alternates instead of following the rally winner · case 02

After a side-out the wrong player is shown serving.

Member previewVariant 2 · 3 implementations · 9 checks per implementation

Case contract

One badminton singles game. rallies is a string of rally winners (A/B). A game is won at 21 points with a two-point lead, or by the first player to 30 points (29-29 next point wins). The rally winner serves next. The server serves from the right court when the server's own score is even and from the left court when odd. Return [a, b, winner, None, None] when finished (later rallies ignored) or [a, b, None, next server, "right"/"left"].

Why this case matters

Umpire scoring pads show the service court and server after each rally.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
boundary receiver wins rally	`[1, 1, null, "A", "left"]`	`[1, 1, null, "B", "left"]`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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