FA-83084 / Go territory scoring / Member archive
A liberty shared by two stones of a chain hides the atari · case 04
Chains whose only liberty touches two of their stones are not reported.
Case contract
Input a board. Report every chain with exactly one distinct liberty as [colour, lib_row, lib_col, chain_size], sorted ascending.
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 fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| atari case 7 | [["W", 3, 3, 3], ["W", 3, 3, 3]] | [["B", 1, 1, 8], ["W", 3, 3, 3], ["W", 3, 3, 3]] | Failed |
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