FA-82905 / Go territory scoring / Member archive

Opponent stones are treated as liberties · case 05

Surrounded chains are never captured and some suicides are accepted.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Input [board, colour, row, col]. Occupied point -> ["illegal", "occupied"]. Otherwise place the stone, remove every adjacent opponent chain left without liberties, then reject the move as ["illegal", "suicide"] only if the placed chain still has no liberty. Return [new_board, captured_stone_count].

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
move result case 6	`[[".B...", "WWWBW", "WW.WB", ".W.WW", "..B.."], 0]`	`[[".B...", "WWWBW", "WW.W.", ".W.WW", "..B.."], 1]`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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