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TFG9 Black Upper Left
First let's look at some simple questions... DaveSigaty What if B just connects?
B has 2 liberties on the left while W has 4 at the top - W wins.
B 5 at 2
Again, B has 2 liberties to W's 4 - W wins.
W 10 at 7
If next B 'a', W 'b', B has only 3 liberties.
This B 1 eliminates the opportunity for W to throw in here and squeeze B. W plays 2 to spoil B's eye but when she answers 3 with 4, B sets up a ko for life on the left with the opportunity to capture W in the top center still open. W can't win this way.
If B tries to prevent W's eye spoiling move with 5, W 6 makes miai of the points marked 'a' and 'b' so B collapses. Note that playing 6 at 'a' lets B make ko with a throw in at 6. REVISION!The variation in 2c above needs to be revised to reflect an improvement for B found on TFG9 - White At The Top.
Continuing from 2b, B plays 1 instead of the original 3. When W throws in at 2, B extends at 3. Although W takes the stone at 4, the space inside her group is much smaller than in the original line and she ends up with only 5 liberties. She has the ko but since the real issue is the survival of the B group on the left, B has more ko threats than W.
W 4 at the marked stone. After 5, B is two moves from capturing the W stones while on the left W is 4 moves away from capturing the B stones. B also has the internal ko threats of 'a' and 'b'. W's position is hopeless. Someone else's turn to post a few lines!
Good luck!
Arno: the points marked as 'a' suffer from a follow up play by white 'b' which will lead to the capture of the crucial marked B stone. That way white will extend her liberties and whatever B tries, he will fail. But there exists another line: TFG9 Black Upper Left 2 This is a copy of the living page "TFG9 Black Upper Left" at Sensei's Library. (C) the Authors, published under the OpenContent License V1.0. |