FA-83039 / Go territory scoring / Member archive

Group tax is charged per stone instead of per chain · case 04

Large living groups are penalised by their size.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Input [board, komi_tenths]. Each colour scores stones + empty regions bordered only by it, minus two points per orthogonally connected chain. Return [black, white, margin_tenths] with margin = 10*(black-white) - komi.

Why this case matters

Go servers and scoring tools compute this value automatically; a wrong answer changes a game result.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
group tax case 0	`[-4, -4, -65]`	`[-4, 2, -125]`	Failed

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

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