FA-83175 / Go territory scoring / Member archive

One extra black point is worth one point of margin instead of two · case 05

The margin is half of the true difference between black and white areas.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Input [size, black_area, komi_tenths] for a board with no dame. White area is size^2 - black_area. Return [margin_tenths, winner] where margin = 10*(black - white) - komi and winner is B, W 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
black count case 0	`[-350, "W"]`	`[-635, "W"]`	Failed

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