(;AW[cd]AW[bd]AW[ad]AW[dc]AW[db]AW[da]AB[dd]AB[ee]AB[ce]AB[be]AB[ae]AB[ec]AB[eb]AW[ea]AB[fa]AB[gb]C[Black to kill (My first problem. If there is something wrong, please let me know.)]AP[goproblems]
(;B[bb];W[bc]
(;B[cb]
(;W[cc]
(;B[ab]C[CHOICERIGHT])
(;B[ca]C[RIGHT])
(;B[ba];W[ab]C[seki])
(;B[aa];W[ab]C[ko]))
(;W[ab]
(;B[cc]C[CHOICERIGHT])
(;B[ca]C[RIGHT])
(;B[ba];W[cc]C[seki])
(;B[aa];W[ba])))
(;B[ca]
(;W[cc]
(;B[ab]LB[ba:1]LB[ac:2]C[CHOICERIGHT])
(;B[cb]C[RIGHT])
(;B[ba];W[ab]C[seki])
(;B[aa];W[ab]C[ko]))
(;W[ab]
(;B[cc]C[CHOICERIGHT])
(;B[cb]C[RIGHT])
(;B[ba];W[cc]C[seki])
(;B[aa];W[ba]C[ko])))
(;B[ab];W[cb]
(;B[ac]C[RIGHT])
(;B[ba]C[RIGHT])
(;B[aa];W[ca]C[seki]))
(;B[ba];W[ab]
(;B[aa];W[cc])
(;B[cb];W[cc]C[seki])
(;B[ca];W[cc]C[seki])
(;B[cc];W[cb]C[seki]))
(;B[aa];W[cb]
(;B[ca];W[ba]C[ko])
(;B[ac];W[ab]C[ko])
(;B[ba];W[ac]C[seki])
(;B[ab];W[ca]C[seki]))
(;B[cc];W[cb];B[aa]C[w can tenuki and it's still only ko or seki (see a19 directly without c17)])
(;B[ac];W[ab]
(;B[ca];W[cc]C[ko]LB[aa:1]LB[ba:2])
(;B[cb];W[ba])
(;B[ba]
(;W[cb]C[seki])
(;W[ge];B[aa];W[cc]))))
(;B[cc];W[bc]
(;B[cb];W[bb];B[ca];W[ba];B[ab]C[RIGHT])
(;B[bb];W[cb];B[aa]C[w can tenuki and it's still only ko or seki (see a19 directly without c17)]))
(;B[cb];W[cc];B[bb];W[ab]
(;B[ca];W[ba]C[ko])
(;B[ba];W[bc]C[seki])
(;B[bc];W[ba]))
(;B[ca];W[bb])
(;B[ba];W[bb])
(;B[aa];W[bb])
(;B[bc]C[NOTTHIS])
(;B[ac]C[NOTTHIS])
(;B[ab]C[NOTTHIS]))