(;AW[ac]AW[bc]AW[bb]AW[da]AW[db]AW[dc]AW[cd]AB[dd]AB[cc]AB[bd]AB[be]AB[de]AB[ec]AB[eb]AB[ea]C[Black to kill]AP[goproblems]
(;B[aa]
(;W[cb]C[CHOICE]
(;B[ba]C[RIGHT])
(;B[ca];W[ba]C[Alive])
(;B[ab];W[ba]C[Alive])
(;B[ad];W[ba]C[Alive])
(;B[ce];W[ba]C[Allive]))
(;W[ba]C[CHOICE]
(;B[cb];W[ca]C[CHOICE]
(;B[cc]C[RIGHT])
(;B[cb];W[cc]C[Alive])
(;B[ce];W[cc]C[Alive])
(;B[ad];W[cc]C[Alive]))
(;B[ca];W[cb]C[Alive])
(;B[ce];W[cb]C[Alive])
(;B[ad];W[cb]C[Alive]))
(;W[ab]C[CHOICE]
(;B[cb];W[ca]
(;B[cc]C[RIGHT])
(;B[cb];W[cc]C[Alive])
(;B[ad];W[cc]C[Alive])
(;B[ce];W[cc]C[Alive]))
(;B[ba]C[RIGHT])
(;B[ca];W[cb]C[Alive: Black cannot connect in B1])
(;B[ad]
(;W[ba]
(;B[cb];W[ca]
(;B[cc]C[RIGHT])
(;B[ce];W[cc]C[Alive])
(;B[cb];W[cc]C[Alive]))
(;B[ce];W[cb]C[Alive])
(;B[ca];W[cb]C[Alive]))
(;W[cb]
(;B[ba]C[RIGHT])
(;B[ca];W[ba]C[Alive])
(;B[ce];W[ba]C[Alive])))
(;B[ce];W[cb]
(;B[ca];W[ba]C[Alive])
(;B[ba];W[ca]C[RIGHT])
(;B[ad];W[ba]C[Alive]))))
(;B[ba];W[aa]
(;B[ca];W[cb]C[Alive])
(;B[ab]C[Only ko])
(;B[cb];W[ca]C[Alive]LB[ba:1]LB[ab:2])
(;B[ad];W[ca];B[ce];W[cb]C[Alive]))
(;B[ca];W[cb]
(;B[ba];W[aa]C[Alive])
(;B[ce];W[ba]C[Alive])
(;B[aa];W[ba]C[Alive])
(;B[ab];W[ba]C[Alive])
(;B[ad];W[ba]C[Alive]))
(;B[cb];W[ca]
(;B[aa];W[cc]C[Alive])
(;B[ba];W[cc]C[Alive])
(;B[ab];W[cc]C[Alive])
(;B[cc];W[aa]
(;B[ad];W[cb]C[Alive])
(;B[ce];W[cb]C[Alive])))
(;B[ab];W[aa]
(;B[cb];W[ca]C[Alive]LB[ba:1]LB[ab:2])
(;B[ca];W[cb]C[Alive])
(;B[ba];W[ca]
(;B[ad];W[cb]C[Alive])
(;B[ce];W[cb]C[Alive]))
(;B[ad];W[cb]C[AliveCHOICE];B[ba];W[ca]C[Still alive]))
(;B[ad];W[aa]
(;B[ca];W[cb]C[Alive])
(;B[ba];W[ca];B[ce];W[cb]C[Alive])
(;B[cb];W[ca]C[Alive]LB[ba:1]LB[ab:2])
(;B[ce];W[cb]C[AliveCHOICE];B[ba];W[ca]C[Still Alive]))
(;B[fa]C[NOTTHIS])
(;B[ae]C[NOTTHIS])
(;B[ce];W[cb]
(;B[ba];W[aa];B[ab]C[Only ko])
(;B[ab];W[aa]C[Alive])
(;B[aa];W[ba])
(;B[ca];W[ba]C[Alive])
(;B[ad];W[ba]C[Alive]))
(;B[ed]C[NOTTHIS])
(;B[fd]C[NOTTHIS]))