FA-82939 / Go territory scoring / Member archive

The candidate position is appended to history before it is checked · case 04

Every move is reported as repeating itself.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Input [history, candidate_board, player_to_move_after, mode]; history is a list of [board, player_to_move]. Positional mode forbids any earlier board equal to the candidate; situational mode additionally requires the same player to move. Return the earliest matching history index or "legal".

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
superko case 0	`5`	`"legal"`	Failed

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