When we learn go, we first run into the star-point. It provides
us with the basic invasion techniques.
Dia. 1 (joseki).The pattern to 12 is a standard invasion joseki.
White secures profit in the corner and Black secures compensating
influence.
Dia. 2 (a little slack).
Black can also make the two-step hane at 6.
If White captures a stone with 7 to 11, Black takes back the corner
territory with 10 and 12. The joseki ends with White's extension to
13, but the result seems a little slack for Black.
Dia. 3 (thickness).
The aim of giving atari on top at 10 is to build
up thickness for Black. If White connects at 13, Black extends at 14;
if instead White plays 11 at 12, Black takes the corner with Black `a',
White 11, Black `b', and Black has gained by playing 10.
Dia. 4 (variation).
White 7 and 9 are an alternative pattern.
Black connects at 10, then takes the corner while White gets a ponnuki.
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