Enclosure Josekis.pdf

Dia. 11 (unreasonable). Cutting immediately at 1 instead of
playing 9 in Dia. 8 is unreasonable. When White extends at 3,
Black intercepts with 4. White can cut with 7 and 9, but Black
forces with 10, then takes the corner with 12. White's group is in
bits and pieces.
Dia. 12 (Black captures). If Black answers 7 by capturing at 8,
White immediately plays the forcing move at 9. When White extends
at 11, reinforcing with 12 is the correct response. White also
fixes up his shape with 13, and the fight comes to a pause. White
can be said to have achieved his objective in making the invasion.
Dia. 13 (resilient). If Black neglects to reinforce with 12 in Dia.
12, White has the aji of the extension at 1. If Black cuts at 2, White 3
is a resilient move which makes it hard for Black to find an answer.
If White plays 3 at `a', Black has the tesuji of attaching at 3.
Dia. 14 (the ko aji). Another strong way for White to play is to
push through and cut with 3 and 5 before making the kosumi at 7.
If Black `a' after 11, White plays `b' and fights a ko.
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