(;SZ[19]AW[bb]AB[cb]AW[db]AW[eb]AW[cc]AB[dc]AB[ec]AB[fc]AB[fb]AB[gb]AB[ea]AW[hb]AW[hc]AW[gc]AW[fd]AW[ee]AW[de]AW[ce]AW[be]AB[dd]GM[1]VW[]
(;B[ca];W[ga]
(;B[bc];W[ac];B[cd];W[bd]
(;B[ab];W[aa];B[ba];W[cc]C[ A ko.RIGHT])
(;B[ba];W[ab]))
(;B[cd];W[bc];B[bd];W[ad];B[ac];W[ab])
(;B[bd];W[cd];B[bc];W[ac]))
(;B[da];W[ga]
(;B[bc];W[ac]
(;B[cd];W[bd];B[ab];W[aa];B[ba];W[ca]C[This is not the way. A
fter black plays elsew
here and white respond
s...];B[ba];W[cc]C[Black cannot win this.];B[ab];W[bc])
(;B[bd];W[cd]))
(;B[ba];W[bc])
(;B[bd];W[cd];B[bc];W[ac]))
(;B[cd];W[bc];B[bd];W[ad]
(;B[da];W[ga];B[ba];W[ac])
(;B[ca];W[ga]
(;B[ba];W[ac])
(;B[ac];W[ab])))
(;B[bc];W[ca];B[cd];W[bd];B[cb];W[ac]
(;B[cc];W[ga]
(;B[ba];W[aa];B[da];W[ab])
(;B[aa];W[ab])
(;B[ab];W[aa];B[da];W[ab]))
(;B[ga];W[cc])
(;B[da];W[ga];B[ab];W[aa];B[ba];W[cc]C[After black makes a ko
threat and white resp
onds...];B[bc];W[ca];B[ba];W[cc]C[Black cannot win this.];B[ab];W[bc])))