4-5 point 4-3 approach ogeima

Ogeima  

After the ogeima, white may

• jump to a, which is treated here
• choose the contact play b ("risky" acc. to Ishida, "not joseki" acc. to modern Chinese joseki books), see 4-5 point 4-3 approach ogeima, contact
• tenuki, see 4-5 point 4-3 approach ogeima, tenuki.

Variations

Jump  

After the jump, black has two options: a and b.

a transfers to the following joseki: 4-5 point 4-3 approach keima, contact at 6-3, which will end in sente for White.

Follow-up  

If b, White ends in gote this way, but gets ahead on the left side.

Mistakes

Elephant's eye  

If hane at the outside, then will cut Black at the elephant's eye. White's table shape is good while Black's shape is broken.

Sacrifice  

Increasing the sacrifice for tempo gain, as with here, is not good in this case. does not get ahead as in the joseki variation, while is hurt. Black indeed still needs to capture the cutting stones (a?) but his shapes are strong so he might jump ahead to c. (Dieter: this diagram needs confirmation)