FA-83853 / Sports scoring and tiebreakers / Member archive

Advantage shown before both players reach forty · case 03

A 40-15 score is rendered as an advantage instead of the numeric score.

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
regression: deuce band	`"advantage A"`	`"40-15"`	Failed

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