(;SZ[13]AW[da]AW[db]AW[bc]AW[cc]AB[eb]AB[dc]AB[fc]AB[cd]AB[dd]AB[cf]C[Black plays, White dies (Black's first move is vital.)]GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2]RU[Japanese]KM[0.00]TM[]PW[White]PB[Black]
(;B[ba];W[bb]
(;B[ea]LB[ba:1]C[Black 1 is the vital point. White cannot make two eyes due to the shortage of liberties.RIGHT])
(;B[bd];W[ca]
(;B[ac];W[aa];B[ad];W[ab])
(;B[ea];W[aa];B[ac];W[ab])
(;B[aa];W[ab])
(;B[ab];W[ac]
(;B[ad];W[aa])
(;B[ea];W[aa])))
(;B[ca];W[aa]C[]
(;B[ab];W[cb]
(;B[ac];W[bd]
(;B[be];W[ad])
(;B[ad];W[be]))
(;B[bd];W[ac])
(;B[aa];W[ac];B[ba];W[aa];B[ab];W[ca]))
(;B[ea];W[cb];B[ac];W[bd];B[ad];W[be])
(;B[bd];W[ac];B[ab];W[cb])))
(;B[bb];W[ba]
(;B[ab];W[cb]
(;B[ac];W[ad]
(;B[bd];W[aa])
(;B[ea];W[bd]))
(;B[bd];W[ac]))
(;B[cb];W[ab]
(;B[ea];W[ca];B[bd];W[ac])
(;B[bd];W[ac];B[ea];W[ca]))
(;B[ca];W[cb])
(;B[aa];W[ab];B[cb];W[ca])
(;B[ac];W[cb]
(;B[ab];W[ad];B[bd];W[aa])
(;B[aa];W[ab])))
(;B[cb];W[bb])
(;B[bd];W[ba]
(;B[ab];W[ac])
(;B[ac];W[ab])
(;B[cb];W[bb])))