A little bit of history.
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$$ | . . . , . . . . . , . . . . . , . . . |[/go]
The taisha (

) dates to the mid 20th century. At first,

was a common response to

, obviously threatening the cut at "a".
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$$ | . . . , . . . . . , . X . . O 1 X . . |
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$$ | . . . . . . . . . . . . . . X . 2 . . |
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$$ | . . . , . . . . . , . . . . . , . . . |[/go]

was tried, as better shape, and after

White is peeping at a bamboo joint.
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$$ | . . . , . . . . . , . X . . O 1 X . . |
$$ | . . . . . . . . . . . . . O X . 6 . . |
$$ | . . . . . . . . . . . . . 3 X . 2 . . |
$$ | . . . . . . . . . . . . . a 4 W . . . |
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$$ | . . . , . . . . . , . . . . . , . . . |[/go]
In that case, why not play

to force

, which Black would not necessarily play after

. After

Black might play the hane at "a" instead.
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$$ | . . . , . . . . . , . X . . O 1 X 6 . |
$$ | . . . . . . . . . . . . . O X . . . . |
$$ | . . . . . . . . . . . . . 3 X . 2 . . |
$$ | . . . . . . . . . . . . . . 4 W . . . |
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$$ | . . . , . . . . . , . . . . . , . . . |[/go]
But then, having played

, why not play

instead of the bamboo joint? Without the bamboo joint,

looks good, and White may regret

.
This gives us the "old joseki" mentioned above.
