FA-81849 / Poker hand evaluation / Member archive

Every flush is promoted to straight flush · case 04

Plain flushes and plain straights are both labelled straight flush.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Input: five distinct cards as rank+suit strings; ranks 2-9, T or 10, J, Q, K, A (case-insensitive), suits c/d/h/s (case-insensitive). Return the standard five-card category name in lower case; A-2-3-4-5 is a straight; royal flush is reported as "straight flush".

Why this case matters

Poker engines settle real money pots from these comparisons; a single misranked hand pays the wrong seat.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
wheel straight	`"straight flush"`	`"straight"`	Failed

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