FA-83939 / Sports scoring and tiebreakers / Member archive

Service court chosen from the combined score · case 04

The server is sent to the wrong court when the scores have different parity.

Member previewVariant 4 · 3 implementations · 10 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, "B", "right"]`	`[1, 1, null, "B", "left"]`	Failed

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