FA-82227 / Poker hand evaluation / Member archive

A-6-7-8-9 ranked as the best straight · case 02

The short-deck wheel beats broadway and six-to-ten straights.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

Input: [hand_a, hand_b], five cards each from a 36-card deck (ranks 6-A). Short-deck ranking: straight flush > quads > flush > full house > straight > trips > two pair > pair > high card. A-6-7-8-9 is the lowest straight (nine high). A card below 6 in either hand makes the result "invalid". Return 1, -1, 0 or "invalid".

Why this case matters

Short-deck tables reuse full-deck evaluators and must patch exactly these rules.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
short wheel vs six-ten	`1`	`-1`	Failed

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