FA-82859 / Go territory scoring / Member archive

White wins are printed with a negative or overstated margin · case 04

Results such as W+3.5 are rendered as "W+-4.5".

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Input [board, komi_tenths]. Area = own stones + empty regions whose orthogonal border touches only that colour. Return [black_area, white_area, result] where result is "B+x.y" / "W+x.y" after subtracting komi from black, or "Draw".

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
area score case 0	`[0, 9, "W+-9.0"]`	`[0, 9, "W+9.0"]`	Failed

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