FA-83510 / Card game rule engines / Member archive

An eight cannot be played on a declared suit · case 05

After a declared suit, eights of other suits are refused.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Input [card, top_card, declared_suit_or_None]. Eights are always playable. When the top card is an 8 with a declared suit, only that suit (or an 8) may follow. Otherwise match suit or rank. Return a bool.

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
playable case 3	`false`	`true`	Failed

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

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