Reduce high enclosure
Assume that White wants to reduce the black framework here, and at the same time strengthen her own a bit.
White plays a probe at .
We shall assume that Black answers strongly at because he doesn't want White to live in the corner. If Black plays at , White plays at . If Black then plays to the right of to kill White, White will play a; have fun investigating that move, it's neat :)
Now White attaches and the sequence to follows.
The beautiful thing about this is of course the timing. White can only play the forcing moves in the corner before attaching at . If White omits the forcing moves, Black can cut after and is unlikely to answer the same way in the corner.