(;AP[goproblems]AB[bd]AB[bf]AB[ce]AB[ae]AW[dd]AW[dc]AW[de]AW[df]AW[cg]AW[bg]AW[cf]AB[cd]AW[eb]C[kill black](;W[bb];B[cb](;W[cc];B[bc];W[ac];B[ba];W[ab];B[ad])(;W[ag];B[ab](;W[ba];B[bc])(;W[ca];B[bc])(;W[ac];B[ba]C[ko is incorrect])(;W[cc];B[bc]))(;W[ac];B[bc](;W[cc];B[ba];W[ab];B[ad])(;W[ab];B[ba];W[ag];B[af];W[cc]C[RIGHT])(;W[ag];B[ab];W[aa];B[ba];W[ca];B[da])))(;W[bc];B[cc])(;W[cb];B[bb]))