FA-83130 / Go territory scoring / Member archive

Occupied points are classified as eyes · case 05

A stone surrounded by its own colour is reported as an eye.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Input [board, row, col]. A point is an eye candidate of colour X if it is empty and every on-board orthogonal neighbour is X. It is false if opponent stones occupy >= 2 diagonals in the centre, or >= 1 diagonal on the edge/corner. Return "eye-X", "false-X" or "none".

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
eye case 6	`"eye-B"`	`"none"`	Failed

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