Liberties
A connected group needs adjacent empty intersections (liberties) to stay on the board.
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A connected group needs adjacent empty intersections (liberties) to stay on the board.
When a group has only one liberty remaining, it is in atari and may be captured next move.
You cannot immediately recreate the board position from the move before your opponent's last move.
A territory is an area of empty intersections you safely surround. Scoring requires agreement over which groups are alive.
More lessons and original problems can be added here as they are prepared.