this is what I know about the punnishment of
(which is indeed usually considered to be an overplay)
white can play
or b and wait to see want to do with the corner later (easy solution avoiding complications)
to me it looks like the fight evolving from a favors black.
- Click Here To Show Diagram Code
[go]$$c easy variation.
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . 1 . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . . . . b 2 . . . . . , . . . |
$$ | . . . a . O . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
better is to directly go into the corner like shown below.
more complicated variation because you have to make sure to immediately neutralize the outside thickness, for example like in the second diagram below.
- Click Here To Show Diagram Code
[go]$$Bcm1 best variation
$$ | . . . , . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . 1 . . . . . .
$$ | . . 7 . . . . . .
$$ | . . 6 5 . . . . .
$$ | . . 4 X . . . . .
$$ | . . 2 3 . O . . .
$$ | . . . 8 9 . . . .
$$ | . . . . . . . . .
$$ --------------------[/go]
- Click Here To Show Diagram Code
[go]$$Wcm1 continuation.
$$ | . . . , . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . X . . . . . .
$$ | . . X . . 4 . . .
$$ | . . O X . 3 5 . .
$$ | . . O X . . . . .
$$ | . . O X 2 O . . .
$$ | . . 1 O X . . . .
$$ | . . . . . . . . .
$$ --------------------[/go]
To back this up I did a pattern search.
Indeed a seems to be very rare (got 19 hits in my database).
from my top diagram got 195 hits, b got 44 hits, both are easy and aim at the invasion on the 3-3 for later.
Playing the 3-3 invasion immediately however seems to be by far the most popular (over 400 hits for the 3-3 move).
this is also explained in the free lessons I made that can be downloaded via the link I posted earlier.
here it is once more for those interested.
Lesson 1