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life and death
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Problem | 21278 |
Created | 2016-08-07 |
Name | cc3/7 |
Source | cc3 |
Rating | |
Difficulty | 9.5 kyu |
Average Solve Time | 75 secs |
User Attempts |
474 / 1358 |
Solve Ratio Rating | 5 kyu |
| rating history |
There is only one way to kill the group. The solution uses a nice and rare trick. Note, that black can kill the group without a ko.
(;FF[4]SZ[9]C[Problem 7 from tsumego.tasuki.org/books/cho-3-advanced.pdf
The marked stone simplifies things. If it's removed, white can setup a hard ko.]
AB[da][ab][cb][eb][fb][cc][gc][gd][ce][de][ge][bf][ef][ff][cg][hb]
AW[ba][db][bc][dc][ec][fc][bd][cd][dd][fd][be][ee]
TR[hb]
(;B[fe];W[bb]
(;B[ea];W[ca])
(;B[ca];W[ea]))
(;B[ea];W[bb]
(;B[fe];W[ca])
(;B[ca];W[ac]
(;B[fe];W[ae])
(;B[ae];W[fe])))
(;B[ca];W[bb]
(;B[fe];W[ea])
(;B[ea];W[ac]
(;B[fe];W[ae])
(;B[ae];W[fe])))
(;B[aa];W[bb])
(;B[bb];W[ca]
(;B[fe];W[ac]
(;B[ea];W[aa]
(;B[bb];W[ab]
(;B[ae];W[cb])
(;B[cb];W[ae]))
(;B[cb];W[bb]))
(;B[aa];W[ca]
(;B[ea];W[ba]
(;B[bb];W[ab];B[cb];W[cc])
(;B[cb];W[bb]))
(;B[ba];W[ca]
(;B[ea];W[ba]
(;B[bb];W[ab];B[cb];W[cc])
(;B[cb];W[bb]))
(;B[ba];W[cb])
(;B[cb];W[ba]
(;B[ea];W[bb])
(;B[aa];W[ab])
(;B[bb];W[ea]
(;B[aa];W[da])
(;B[da];W[ab]))))))
(;B[ea];W[ac]
(;B[fe];W[aa]
(;B[bb];W[ab]
(;B[ae];W[cb])
(;B[cb];W[ae]))
(;B[cb];W[bb]))
(;B[aa];W[ca]
(;B[fe];W[ba]
(;B[bb];W[ab];B[cb];W[cc])
(;B[cb];W[bb]))
(;B[ba];W[ca]
(;B[fe];W[ba]
(;B[bb];W[ab];B[cb];W[cc])
(;B[cb];W[bb]))
(;B[ba];W[cb])
(;B[aa];W[ba]
(;B[bb];W[ab];B[cb];W[cc])
(;B[cb];W[fe]
(;B[bb];W[ae])
(;B[ae];W[ab])))
(;B[bb];W[cb])
(;B[ad];W[fe]
(;B[ae];W[aa]
(;B[ba];W[bb])
(;B[bb];W[ba])
(;B[cb];W[ba]))
(;B[cb];W[ba]
(;B[bb];W[ae])
(;B[ae];W[aa])))
(;B[ae];W[ba]
(;B[bb];W[ab];B[cb];W[cc])
(;B[cb];W[bb]))
(;B[cb];W[ba]
(;B[fe];W[bb])
(;B[aa];W[fe]
(;B[bb];W[ae])
(;B[ae];W[ab]))
(;B[bb];W[ae]
(;B[fe]C[RIGHT])
(;B[aa];W[fe]))
(;B[ad];W[aa]
(;B[fe];W[ae])
(;B[bb];W[ab])
(;B[ae];W[bb])
(;B[ab];W[bb]))
(;B[ae];W[bb])))
(;B[ad];W[fe]
(;B[ba];W[ca]
(;B[ae];W[aa]
(;B[ba];W[bb])
(;B[bb];W[ba])
(;B[cb];W[ba]))
(;B[cb];W[ba]
(;B[bb];W[ae])
(;B[ae];W[aa])))
(;B[ae];W[ba]
(;B[bb];W[aa]
(;B[cb];W[ab])
(;B[ab];W[cb]))
(;B[cb];W[aa]
(;B[bb];W[ab])
(;B[ab];W[bb]))))
(;B[ae];W[ba]
(;B[bb];W[ab];B[cb];W[cc])
(;B[cb];W[bb])))
(;B[ad];W[aa])
(;B[ae];W[aa]
(;B[bb];W[cb])
(;B[cb];W[bb])))
(;B[aa];W[ca]
(;B[fe];W[ac]
(;B[ea];W[ba]
(;B[bb];W[ab];B[cb];W[cc])
(;B[cb];W[bb]))
(;B[ba];W[ca]
(;B[ea];W[ba]
(;B[bb];W[ab];B[cb];W[cc])
(;B[cb];W[bb]))
(;B[ba];W[cb])
(;B[cb];W[ba]
(;B[ea];W[bb])
(;B[aa];W[ab])
(;B[bb];W[ea]
(;B[aa];W[da])
(;B[da];W[ab])))))
(;B[ea];W[ac]
(;B[fe];W[ba]
(;B[bb];W[ab];B[cb];W[cc])
(;B[cb];W[bb]))
(;B[ba];W[ca]
(;B[fe];W[ba]
(;B[bb];W[ab];B[cb];W[cc])
(;B[cb];W[bb]))
(;B[ba];W[cb])
(;B[aa];W[ba]
(;B[bb];W[ab];B[cb];W[cc])
(;B[cb];W[fe]
(;B[bb];W[ae])
(;B[ae];W[ab])))
(;B[bb];W[cb])
(;B[ad];W[fe]
(;B[ae];W[aa]
(;B[ba];W[bb])
(;B[bb];W[ba])
(;B[cb];W[ba]))
(;B[cb];W[ba]
(;B[bb];W[ae])
(;B[ae];W[aa])))
(;B[ae];W[ba]
(;B[bb];W[ab];B[cb];W[cc])
(;B[cb];W[bb]))
(;B[cb];W[ba]
(;B[fe];W[bb])
(;B[aa];W[fe]
(;B[bb];W[ae])
(;B[ae];W[ab]))
(;B[bb];W[ae]
(;B[fe]C[RIGHT])
(;B[aa];W[fe]))
(;B[ad];W[aa]
(;B[fe];W[ae])
(;B[bb];W[ab])
(;B[ae];W[bb])
(;B[ab];W[bb]))
(;B[ae];W[bb])))
(;B[ad];W[fe]
(;B[ba];W[ca]
(;B[ae];W[aa]
(;B[ba];W[bb])
(;B[bb];W[ba])
(;B[cb];W[ba]))
(;B[cb];W[ba]
(;B[bb];W[ae])
(;B[ae];W[aa])))
(;B[ae];W[ba]
(;B[bb];W[aa]
(;B[cb];W[ab])
(;B[ab];W[cb]))
(;B[cb];W[aa]
(;B[bb];W[ab])
(;B[ab];W[bb]))))
(;B[ae];W[ba]
(;B[bb];W[ab];B[cb];W[cc])
(;B[cb];W[bb])))
(;B[ba];W[ac]
(;B[fe];W[ca]
(;B[ea];W[ba]
(;B[bb];W[ab];B[cb];W[cc])
(;B[cb];W[bb]))
(;B[ba];W[cb])
(;B[cb];W[ba]
(;B[ea];W[bb])
(;B[aa];W[ab])
(;B[bb];W[ea]
(;B[aa];W[da])
(;B[da];W[ab]))))
(;B[ea];W[ca]
(;B[fe];W[ba]
(;B[bb];W[ab];B[cb];W[cc])
(;B[cb];W[bb]))
(;B[ba];W[cb])
(;B[aa];W[ba]
(;B[bb];W[ab];B[cb];W[cc])
(;B[cb];W[fe]
(;B[bb];W[ae])
(;B[ae];W[ab])))
(;B[bb];W[cb])
(;B[ad];W[fe]
(;B[ae];W[aa]
(;B[ba];W[bb])
(;B[bb];W[ba])
(;B[cb];W[ba]))
(;B[cb];W[ba]
(;B[bb];W[ae])
(;B[ae];W[aa])))
(;B[ae];W[ba]
(;B[bb];W[ab];B[cb];W[cc])
(;B[cb];W[bb]))
(;B[cb];W[ba]
(;B[fe];W[bb])
(;B[aa];W[fe]
(;B[bb];W[ae])
(;B[ae];W[ab]))
(;B[bb];W[ae]
(;B[fe]C[RIGHT])
(;B[aa];W[fe]))
(;B[ad];W[aa]
(;B[fe];W[ae])
(;B[bb];W[ab])
(;B[ae];W[bb])
(;B[ab];W[bb]))
(;B[ae];W[bb])))
(;B[ca];W[ea]
(;B[cb];W[da])
(;B[da];W[ca]
(;B[ea];W[fe]
(;B[ae];W[ba])
(;B[cb];W[ba]))
(;B[ba];W[cb])
(;B[cb];W[ba]
(;B[ea];W[bb])
(;B[aa];W[ab])
(;B[bb];W[ea]))))
(;B[ad];W[fe]
(;B[ea];W[ca]
(;B[ae];W[aa]
(;B[ba];W[bb])
(;B[bb];W[ba])
(;B[cb];W[ba]))
(;B[cb];W[ba]
(;B[bb];W[ae])
(;B[ae];W[aa])))
(;B[ae];W[ca]
(;B[ea];W[aa]
(;B[ba];W[bb])
(;B[bb];W[ba])
(;B[cb];W[ba]))
(;B[ba];W[cb])
(;B[cb];W[ba]
(;B[ea];W[aa])
(;B[aa];W[ab])
(;B[bb];W[ea]))))
(;B[ae];W[ca]
(;B[ea];W[ba]
(;B[bb];W[ab];B[cb];W[cc])
(;B[cb];W[bb]))
(;B[ba];W[cb])
(;B[cb];W[ba]
(;B[ea];W[bb])
(;B[aa];W[ab])
(;B[bb];W[ea]
(;B[aa];W[da])
(;B[da];W[ab])))))
(;B[ac];W[ea]
(;B[ba];W[ad])
(;B[ad];W[ae])
(;B[ae];W[ad])
(;B[da];W[ad]
(;B[ea];W[ba]
(;B[bb];W[ab];B[cb];W[cc])
(;B[cb];W[bb]))
(;B[ba];W[fe]
(;B[ea];W[ca]
(;B[ba];W[cb])
(;B[bb];W[cb])
(;B[cb];W[bb])
(;B[ab];W[ba]))
(;B[ca];W[ea])
(;B[ae];W[ca]
(;B[ba];W[cb])
(;B[cb];W[ba])))))
(;B[ad];W[ea]
(;B[ba];W[ac])
(;B[ac];W[ae])
(;B[ae];W[ac])
(;B[da];W[ac]
(;B[ea];W[fe]
(;B[ba];W[ca]
(;B[ae];W[aa])
(;B[cb];W[ba]))
(;B[ae];W[ba]
(;B[bb];W[aa])
(;B[cb];W[aa])))
(;B[ba];W[fe]
(;B[ea];W[ca]
(;B[ae];W[aa])
(;B[cb];W[ba]))
(;B[ae];W[ca]
(;B[ea];W[aa])
(;B[ba];W[cb])
(;B[cb];W[ba])))))
(;B[ae];W[ac]
(;B[ea];W[ba]
(;B[bb];W[ab];B[cb];W[cc])
(;B[cb];W[bb]))
(;B[ba];W[ca]
(;B[ea];W[ba]
(;B[bb];W[ab];B[cb];W[cc])
(;B[cb];W[bb]))
(;B[ba];W[cb])
(;B[cb];W[ba]
(;B[ea];W[bb])
(;B[aa];W[ab])
(;B[bb];W[ea]
(;B[aa];W[da])
(;B[da];W[ab]))))))
(;B[ac];W[ea]
(;B[aa];W[ad])
(;B[ad];W[ae])
(;B[ae];W[ad])
(;B[da];W[ad]
(;B[ea];W[aa]
(;B[bb];W[ab];B[cb];W[cc])
(;B[cb];W[bb]))
(;B[aa];W[ca]
(;B[ea];W[ba]
(;B[bb];W[ab];B[cb];W[cc])
(;B[cb];W[bb]))
(;B[ba];W[fe]
(;B[ea];W[ca]
(;B[ba];W[cb])
(;B[bb];W[cb])
(;B[cb];W[bb])
(;B[ab];W[ba]))
(;B[ca];W[ea])
(;B[ae];W[ca]
(;B[ba];W[cb])
(;B[cb];W[ba]))))))
(;B[ad];W[ea]
(;B[aa];W[ac])
(;B[ac];W[ae])
(;B[ae];W[ac])
(;B[da];W[ac]
(;B[ea];W[aa])
(;B[aa];W[ae]
(;B[fe];W[ca]
(;B[ed];W[ba])
(;B[ea];W[ba]
(;B[bb];W[ab])
(;B[cb];W[bb]))
(;B[ba];W[ca]
(;B[ea];W[ba])
(;B[ba];W[cb])
(;B[cb];W[ba])))
(;B[ea];W[fe])
(;B[ca];W[fe]))))
(;B[ae];W[ac]
(;B[ea];W[aa]
(;B[bb];W[cb])
(;B[cb];W[bb]))
(;B[aa];W[ca]
(;B[ea];W[ba]
(;B[bb];W[ab];B[cb];W[cc])
(;B[cb];W[bb]))
(;B[ba];W[ca]
(;B[ea];W[ba]
(;B[bb];W[ab];B[cb];W[cc])
(;B[cb];W[bb]))
(;B[ba];W[cb])
(;B[cb];W[ba]
(;B[ea];W[bb])
(;B[aa];W[ab])
(;B[bb];W[ea]
(;B[aa];W[da])
(;B[da];W[ab])))))))
(;B[ac];W[bb])
(;B[ad];W[bb])
(;B[ae];W[bb]))
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