FA-82893 / Go territory scoring / Member archive

A capturing move into a surrounded point is rejected as suicide · case 03

Taking the last liberty of an enclosing chain is refused although it would capture.

Member previewVariant 3 · 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 7	`["illegal", "suicide"]`	`[["B.B", "WB.", ".WB"], 1]`	Failed

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