FA-82900 / Go territory scoring / Member archive

Only one of several simultaneously captured chains is removed · case 05

A move that removes the last liberty of two opponent chains leaves one of them on the board.

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	`[["WB.BB", "B.B.W", "BBWBB", "B.BW."], 1]`	`[["WB.BB", "B.B.W", "BB.BB", "B.BW."], 2]`	Failed

MEMBER ARCHIVE

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

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