3-4 point low approach two space extension

two space extension  

in response to is a slow but steady move. White may choose this joseki if the position on the top side merits such a low and solid position.

continuation  

Joseki

mistake  

It's a mistake for White to counter-atari with 8 -- White's shape get split.

 

This appeared in the 1977 Kisei match between Fujisawa Shuko (Black) and Hashimoto Utaro (White), both 9-dan professionals. invades the high Chinese opening, and invades the White upper left corner in a tit-for-tat response. Owing to the very strong Black influence in the lower left, chooses the two-space extension over attacking by the diagonal attachment at a or even the more conservative small knight's move at b.