Actually,
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[go]$$B Standard line
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . 4 3 5 . . . |
$$ | . . . , . . . . . 7 , . 6 . 2 9 1 . . |
$$ | . . . . . . . . . . . . . . a 0 8 . . |
$$ | . . . . . . . . . . . . . . . . . . . |[/go]
the standard line (joseki) is

followed by the atari at "a" and a fight. OC, Black cannot do that if White has made a solid connection instead of a hanging connection.
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[go]$$Bm9 Passive
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . O X X . . . |
$$ | . . . , . . . . . X , . O . O . X 1 . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |[/go]
Often such passive plays are self punishing, and White can even tenuki, satisfied with a local advantage. In this case, however, White may be concerned about a fight.
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[go]$$Bm9 Simple and strong
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . O X X . . . |
$$ | . . . , . . . . . X , . O . O . X 1 . |
$$ | . . . . . . . . . . . . . . . 2 O . . |
$$ | . . . . . . . . . . . . . . . . . . . |[/go]

is simple and strong.
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[go]$$Bm9 More aggressive
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . b . . |
$$ | . . . . . . . . . . . . . O X X a . . |
$$ | . . . , . . . . . X , . O . O 2 X 1 . |
$$ | . . . . . . . . . . . . . . . d O c . |
$$ | . . . . . . . . . . . . . . . . . . . |[/go]

here is more aggressive, aiming at "a" or "b" or "c", while leaving the weakness at "d".
Either is generally playable.
