FA-83044 / Go territory scoring / Member archive

Diagonally touching stones are merged into one taxed chain · case 04

Players are under-taxed for diagonal shapes and regions leak diagonally.

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	`[0, 19, -195]`	`[0, 17, -175]`	Failed

MEMBER ARCHIVE

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

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