(;AB[aa]AB[ac]AB[bc]AB[cc]AB[dc]AB[ec]AB[eb]AB[ea]AW[bb]AW[cb]AW[fb]AW[gb]AW[fd]AW[ed]AW[dd]AW[cd]AW[bd]AW[ad]AP[goproblems]
(;B[ca]C[RIGHT]
(;W[db]C[Seki, White cannot kill Black. White has to play D18 otherwise Black makes life.CHOICERIGHT];B[ce];W[fc];B[de];W[fa]
(;B[ba]C[sekiRIGHT])
(;B[ab]C[sekiRIGHT]))
(;W[fc];B[db];W[fa];B[ab]))
(;B[db];W[ca]C[])
(;B[ab];W[ca]C[]))