(;AW[ea]AW[fa]AW[eb]AW[dc]AW[cd]AW[dd]AW[ed]AW[fd]AW[ae]AW[be]AW[de]AW[fe]AW[af]AW[df]AW[ef]AB[ga]AB[fb]AB[gb]AB[cc]AB[ec]AB[fc]AB[gd]AB[ce]AB[ge]AB[bf]AB[cf]AB[ff]AB[gf]AB[ag]AB[bg]AB[dg]AB[eg]AB[fg]C[Black to play and kill white unconditionally]SZ[19]GM[1]FF[3]RU[Japanese]HA[0]KM[5.5]PW[White]PB[Black]GN[White (W) vs. Black (B)]DT[1999-07-28]SY[Cgoban 1.9.2]TM[30:00(5x1:00)]
(;B[bc];W[cb]
(;B[bd];W[db])
(;B[bb];W[bd]
(;B[ca];W[db];B[ac];W[da];B[ba];W[aa])
(;B[db];W[da];B[ba];W[ac];B[ab];W[ad])
(;B[ba];W[db];B[ca];W[ac];B[ab];W[ad])))
(;B[bb];W[cb]
(;B[ca];W[bc]
(;B[ac];W[bd];B[db]C[snapback city.RIGHT])
(;B[db];W[ac]
(;B[bd];W[ad]
(;B[cc]C[ko. you can do better.])
(;B[ab];W[cc]))
(;B[cc];W[bd]))
(;B[ab];W[ac]))
(;B[bc];W[bd]
(;B[ca];W[db]
(;B[ac];W[da];B[ba];W[aa])
(;B[ba];W[ac];B[ab];W[ad]))
(;B[ba];W[db]
(;B[ca];W[ac];B[ab];W[ad])
(;B[ac];W[ca])))
(;B[bd];W[bc];B[ac];W[ca];B[db];W[da];B[cc]C[only ko. you can do better.]))
(;B[cb];W[bc]
(;B[db];W[bd])
(;B[bb];W[db]
(;B[bd];W[ad];B[ab];W[ca];B[ba];W[da])
(;B[ac];W[bd]
(;B[ca];W[ad];B[ab];W[ba])
(;B[ab];W[ca];B[ba];W[da]))
(;B[ab];W[ca]
(;B[ac];W[bd];B[ba];W[da])
(;B[bd];W[ad];B[ba];W[da]))))
(;B[ca];W[db]
(;B[bc];W[cb]
(;B[bb];W[bd]
(;B[ac];W[da]
(;B[ad];W[ba])
(;B[ba];W[ab]))
(;B[ba];W[ac];B[ab];W[ad]))
(;B[bd];W[bb]))
(;B[bd]
(;W[bc];B[bb];W[ad]
(;B[cb];W[ab];B[aa]C[ko. you can do better.])
(;B[ab];W[cb];B[ac];W[bd])
(;B[ac];W[ab]))
(;W[cb];B[bb];W[bc];B[ac])
(;W[bb]
(;B[cb];W[bc])
(;B[bc];W[cb])))
(;B[bb];W[bd]
(;B[bc];W[ac];B[ab];W[cb];B[ad];W[ba];B[aa])
(;B[cb];W[bc];B[ac];W[da];B[ab];W[ba])
(;B[ac];W[bc];B[cb];W[aa];B[da];W[ab];B[ba];W[ab];B[aa];W[ab]))
(;B[cb];W[bc]
(;B[bb];W[ab];B[bd];W[ad];B[aa]C[ko. you can do better.])
(;B[bd];W[ad];B[bb];W[ab];B[aa]C[ko. you can do better.])))
(;B[ac];W[bd]C[black is lost. for variations, try the mirror of this move.])
(;B[db];W[cb]
(;B[da];W[bc];B[ac];W[ab])
(;B[bb];W[bc]
(;B[ca];W[ac]C[ko]
(;B[bd];W[ad]
(;B[cc]C[ko. you can do better.])
(;B[ab];W[cc]))
(;B[cc];W[bd]))
(;B[ac];W[da];B[bd];W[cc])))
(;B[bd];W[cb]
(;B[bc];W[bb]
(;B[ab];W[ba])
(;B[db];W[da];B[ab];W[ba]))
(;B[bb];W[bc]
(;B[ca];W[ad])
(;B[ac];W[ca]C[ko];B[db];W[da];B[cc]C[only ko. you can do better.]))))
adum