FA-82307 / Poker hand evaluation / Member archive

Chen score rounded to even instead of up · case 02

Nine-seven offsuit scores 2 instead of 3.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

Input: two hole cards. Chen score: highest card points A=10, K=8, Q=7, J=6, else half its rank (2..10). Pairs double the points with a minimum of 5. Suited adds 2. Gap between ranks (cards strictly between) subtracts 0, 1, 2, 4 for gaps 0-3 and 5 for 4+. Add 1 for gap 0 or 1 when both cards are below a queen. Round the final score up.

Why this case matters

Starting-hand heuristics in training tools and bots use this scoring.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
nine seven offsuit	`4`	`5`	Failed

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