3-5 point very high approach
This is a very uncommon play: though used by Go Seigen, and played by Kataoka Satoshi against Yamashita Keigo in 2000.
In the few examples, Black plays at a, or tsukehiki at b, in either case taking a large profit.
Suppose is played: then is expected. This position would occur if Black had a small low enclosure and White capped it with ; and then Black played tenuki. That would be an odd tenuki to make, locally speaking.
After annd we return to a known position for the 3-5 point high approach. White has avoided the variations at a or b (i.e. White initially approaches Black's 3-5 point at and Black plays a or b in answer).