FA-83469 / Card game rule engines / Member archive

Queen-king-ace is rejected as a run · case 04

Ace-high runs are invalid because ace only counts low.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Input a list of cards. A set is 3-4 cards of one rank in distinct suits. A run is 3+ consecutive cards of one suit; ace is low (A-2-3) or high (Q-K-A) but runs do not wrap (K-A-2). Return "set", "run" or "invalid".

Why this case matters

Card-game engines, scoring apps and online tables apply this rule automatically on every hand.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
meld case 7	`"invalid"`	`"run"`	Failed

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