The plan of actions across streets.
Written as b/b/b (bet three times) or x/c (check-call). Hands split into four groups (value / showdown value / semi-bluff / give up), with default line examples: Strong b/b/b (top pair against a standard player b/b/x), Medium b/x/b, Draw b/b/x, Air b/x/x. They change with the opponent and your role.