FA-83843 / Sports scoring and tiebreakers / Member archive

Tennis game ends on a one-point lead after deuce · case 03

After deuce the display jumps straight to a game instead of showing advantage.

Member previewVariant 3 · 3 implementations · 10 checks per implementation

Case contract

points is a string of rally winners, each character A or B. A game ends at the first point where a player has at least 4 points and leads by at least 2; characters after that point are ignored. Return "game A"/"game B" when finished; otherwise "deuce" when both have at least 3 points and are level, "advantage A"/"advantage B" when both have at least 3 points and differ by one, else "S-R" using the labels 0, 15, 30, 40 in A-B order. A character other than A or B that is reached before the game ends returns "invalid point <c>".

Why this case matters

Live scoreboards and umpire tablets derive the displayed tennis game score from a raw rally log.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
boundary advantage after deuce	`"game B"`	`"advantage B"`	Failed

MEMBER ARCHIVE

The complete case is available to members.

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

Member access is invitation-based. Sign in with your invited account to inspect the sources.