FA-83182 / Go territory scoring / Member archive

The button goes to the last player to pass · case 02

The ending pass, not the first pass, earns the half point.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

Input [area_b, area_w, passes, komi_tenths]. The first player ever to pass takes the button worth half a point. Return [black_tenths, white_tenths, winner] with winner 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
button case 0	`[1860, 1875, "W"]`	`[1865, 1870, "W"]`	Failed

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