Touching the weak stone like this is a horrible move. Immediately , it occurs to me that this is either an mistake or there is a special case application that makes this playable. The Sakata-Go game shows an example of the special case:
Here touching the weak black stone allows Sakata play in sente.
There is some number of games where White has a wall of three or more stones one space to the right of or where and where played before the touch of .
Can't we add a word of warning to the readers of Sensei's Library that this joseki is a special case that requires a position in which is valuable enough or a white wall already exists to make this line of play feasible ?
This page is supposedly still under WME... but thanks for the note and the example.
By the way, which is the correct date for the Sakata-Go game?