(Referenced by 528)

:
The potential of the oki appears for the first time, only after Black's attempt to escape with his centre group is blocked at top left. In the variation here, White captures Black's centre group, which is the external part of the hanezeki - the hanezeki's tail - just after Black finished the Crosscut Sequence. Fujisawa Hideyuki showed this move earlier, with , at the beginning of the Crosscut Sequence, but we found the later moment to suit the demonstration below better.

:
Black recaptures.

:
This move is sente at any time. The sequence from here on is shown for the sake of better understanding, but need not be played immediately.

, :
White cannot prevent Black from occupying the liberties of her -group, up to , and then capturing it with .

As we know already ( 882), White loses 23 points when capturing Black's centre group. This is because the hanezeki is dissolved thereafter, and White loses more stones than she has previously captured in the centre.
If we complete the boundaries between the Black and White areas with the -stones (it is not relevant exactly how the borders are drawn, because we will calculate gains and losses in comparison with this final position), ...

... we can see that Black wins by approximately 40 points. It is thus a mistake to capture Black's centre group so early. It also is understandable, that, with such an easy victory, the oki will be given the back seat, and that the relatively small territorial effect of the oki will fade into oblivion during the next 60 moves.