FA-81968 / Poker hand evaluation / Member archive

Unknown ten token silently hashes as an ace · case 03

A hand holding "10h" and an ace is reported as a pair.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Input: five cards "Rs" (rank may be written "10" for ten; suits ignored, repeated ranks allowed up to four). Each rank maps to a distinct prime (2 for deuce ... 41 for ace); the product of the five primes is factored back into rank multiplicities, and the sorted multiplicity pattern names the rank shape: four of a kind, full house, three of a kind, two pair, one pair or high card.

Why this case matters

Prime-product hashing is how table-driven evaluators identify non-flush rank multisets.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
ten token with ace	`"one pair"`	`"high card"`	Failed

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